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 <span id="projectnumber">2.1.0</span>
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<div class="title">Release Notes </div> </div>
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<div class="textblock"> <a name="v2_1_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 2.1.0</b> - <em>December 12, 2013</em><ul>
<li>Added a small number of Maya nodes, primarily for conversion of geometry to and from OpenVDB volumes and for visualization of volumes.</li>
<li>Added an initial implementation of <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetMorphing.html">level set morphing</a> (with improvements to follow soon).</li>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetMeasure.html">tools::LevelSetMeasure</a>, which efficiently computes the surface area, volume and average mean-curvature of narrow-band level sets, in both world and voxel units. Those quantities are now exposed as intrinsic attributes on the Houdini VDB primitive and can be queried using the native Measure SOP.</li>
<li><a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1Dense.html">tools::Dense</a> now supports the XYZ memory layout used by Houdini and Maya in addition to the ZYX layout used in OpenVDB trees.</li>
<li>Improved the performance of masking in the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetFilter.html">level set filter</a> tool and added inversion and scaling of the mask input, so that any scalar-valued volume can be used as a mask, not just volumes with a [0, 1] range.</li>
<li>Added optional masking to the non-level-set filters, to the grid operators (CPT, curl, divergence, gradient, Laplacian, mean curvature, magnitude, and normalize) and to the Analysis and Filter SOPs.</li>
<li>Added more narrow band controls to the Rebuild Level Set SOP.</li>
<li>Improved the accuracy of the <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a42ea3c773bf61480206095e14bb62238">level set rebuild</a> tool.</li>
<li>Added <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a9fa99ba23890494cdfe09a6d6abdd380">tools::activate</a> and <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#abc78330c21bf8fc7b0840d7ab6f0675d">tools::deactivate</a>, which set the active states of tiles and voxels whose values are equal to or approximately equal to a given value, and added a Deactivate Background Voxels toggle to the Combine SOP.</li>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1BBox.html#a82bf71bb2a279fbf778c0927bba67ea2">BBox::applyMap</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1BBox.html#ad5cea98d8cd7acf355acc91b76f906c0">BBox::applyInverseMap</a>, which allow for transformation of axis-aligned bounding boxes.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1PositionShader.html">position shader</a> to the level set ray-tracer (primarily for debugging purposes).</li>
<li>Added an <a class="el" href="classopenvdb_1_1v2__1__0_1_1io_1_1Queue.html">io::Queue</a> class that manages a concurrent queue for asynchronous serialization of grids to files or streams.</li>
<li>Fixed a bug in <a class="el" href="classopenvdb_1_1v2__1__0_1_1io_1_1Archive.html">io::Archive</a> whereby writing unnamed, instanced grids (i.e., grids sharing a tree) to a file rendered the file unreadable.</li>
<li>Fixed a bug in the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1VolumeToMesh.html">volume to mesh</a> converter that caused it to generate invalid polygons when the zero crossing lay between active and inactive regions.</li>
<li>Fixed a bug in the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1UniformPointScatter.html">point scatter</a> tool (and the Scatter SOP) whereby the last voxel always remained empty.</li>
<li>Fixed a bug in the Read SOP that caused grids with the same name to be renamed with a numeric suffix (e.g., “grid[1]” “grid[2]”, etc.).</li>
<li>Fixed some unit test failures on 64-bit Itanium machines.</li>
</ul>
</dd></dl>
<dl class="section user"><dt></dt><dd>API changes:<ul>
<li>The <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1Filter.html">Filter</a> tool is now templated on a mask grid, and threading is controlled using a grain size, for consistency with most of the other level set tools.</li>
<li>The <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetFilter.html">LevelSetFilter</a> tool is now templated on a mask grid.</li>
<li>All shaders now take a ray direction instead of a ray.</li>
</ul>
</dd></dl>
<a name="v2_0_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 2.0.0</b> - <em>October 31, 2013</em><ul>
<li>Added a <a class="el" href="python.html">Python module</a> with functions for basic manipulation of grids (but no tools, yet).</li>
<li>Added ray intersector tools for efficient, hierarchical intersection of rays with <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetRayIntersector.html">level-set</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1VolumeRayIntersector.html">generic</a> volumes.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1Ray.html">Ray</a> class and a hierarchical <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1DDA.html">Digital Differential Analyzer</a> for fast ray traversal.</li>
<li>Added a fully multi-threaded <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetRayTracer.html">level set ray tracer</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1PerspectiveCamera.html">camera</a> <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1OrthographicCamera.html">classes</a> that mimic Houdini’s cameras.</li>
<li>Added a simple, command-line renderer (currently for level sets only).</li>
<li>Implemented a new meshing scheme that produces topologically robust two-manifold meshes and is twice as fast as the previous scheme.</li>
<li>Implemented a new, topologically robust (producing two-manifold meshes) level-set-based seamless fracture scheme. The new scheme eliminates visible scarring seen in the previous implementation by subdividing internal, nonplanar quads near fracture seams. In addition, fracture seam points are now tagged, allowing them to be used to drive pre-fracture dynamics such as local surface buckling.</li>
<li>Improved the performance of <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a957fe86bcd8fb552764ce293ef416d44">Tree::evalActiveVoxelBoundingBox</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a5a6a7cd039e1524a3b0a91c8e489970d">Tree::activeVoxelCount</a>, and significantly improved the performance of <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a894624c52ca504479fdc5164cb52083a">Tree::evalLeafBoundingBox</a> (by about 30x).</li>
<li>Added a tool (and a Houdini SOP) that fills a volume with adaptively-sized overlapping or non-overlapping spheres.</li>
<li>Added a Ray SOP that can be used to perform geometry projections using level-set ray intersections or closest-point queries.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1ClosestSurfacePoint.html">tool</a> that performs accelerated closest surface point queries from arbitrary points in world space to narrow-band level sets.</li>
<li>Increased the speed of masked level set filtering by 20% for the most common cases.</li>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1BoxStencil.html">math::BoxStencil</a>, with support for trilinear interpolation and gradient computation.</li>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a4a4089e30211443f0d6431cff8bef3cc">Tree::topologyIntersection</a>, which intersects a tree’s active values with those of another tree, and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a7c6ad1abf61c3b13d7ad7408f4634226">Tree::topologyDifference</a>, which performs topological subtraction of one tree’s active values from another’s. In both cases, the <code>ValueType</code>s of the two trees need not be the same.</li>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#ac88047fd749080fc90e6b431a55710e9">Tree::activeTileCount</a>, which returns the number of active tiles in a tree.</li>
<li>Added <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1math.html#ab4ed2960c4a8c56b8de032917dfb92a9">math::MinIndex</a> and <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1math.html#acff7efa7899b16ae33eff2261db128f1">math::MaxIndex</a>, which find the minimum and maximum components of a vector without any branching.</li>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1BBox.html#af0a30e92d1d69b59583830eb3c5173cc">BBox::minExtent</a>, which returns a bounding box’s shortest axis.</li>
<li>The default <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1BBox.html">BBox</a> constructor now generates an invalid bounding box rather than an empty bounding box positioned at the origin. The new behavior is consistent with <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1CoordBBox.html">CoordBBox</a>. <em>[Thanks to Rick Hankins for suggesting this fix.]</em></li>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1CoordBBox.html#ad20897c5c8bd47f5d4005989bead0e55">CoordBBox::reset</a>, which resets a bounding box to its initial, invalid state.</li>
<li>Fixed a bug in the default <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1ScaleMap.html">ScaleMap</a> constructor that left some data used in the inverse uninitialized.</li>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1MapBase.html#a5f11d33257da628b37706331d488abe3">MapBase::applyJT</a>, which applies the Jacobian transpose to a vector (the Jacobian transpose takes a range-space vector to a domain-space vector, e.g., world to index), and added <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1MapBase.html#af70314db95e0fa0df35749c79700d0e7">MapBase::inverseMap</a>, which returns a new map representing the inverse of the original map (except for <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1NonlinearFrustumMap.html">NonlinearFrustumMap</a>, which does not currently have a defined inverse map). <br/>
<b>Note:</b> Houdini 12.5 uses an earlier version of OpenVDB, and maps created with that version lack virtual table entries for these new methods, so do not call these methods from Houdini 12.5.</li>
<li>Reimplemented <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1math.html#abf8ba920fc1b890e07a57cff872c5f57">math::RandomInt</a> using Boost.Random instead of <code>rand()</code> (which is not thread-safe), and deprecated <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1math.html#ad57956227745e423b84bc0f0791ea3bb">math::randUniform</a> and added <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1math.html#a99f853a1b932705029be5e71607b6bbd">math::Random01</a> to replace it.</li>
<li>Modified <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a718fc3e33310680728f4fbf04db240c0">tools::copyFromDense</a> and <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#acbd41a08ed8ea7c1a7d33146b8d17ce1">tools::copyToDense</a> to allow for implicit type conversion (e.g., between a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1Dense.html">Dense<Int32></a> and a <a class="el" href="namespaceopenvdb_1_1v2__1__0.html#a6b41620b1f0b01f83684d2e024728562">FloatTree</a>) and fixed several bugs in <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1CopyFromDense.html">tools::CopyFromDense</a>.</li>
<li>Fixed bugs in <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1Stats.html">math::Stats</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1Histogram.html">math::Histogram</a> that could produce <code>NaN</code>s or other incorrect behavior if certain methods were called on populations of size zero.</li>
<li>Renamed <code>struct tolerance</code> to <a class="el" href="structopenvdb_1_1v2__1__0_1_1math_1_1Tolerance.html">math::Tolerance</a> and <code>negative</code> to <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1math.html#a96ce9aa340412800029fe4456aaad867">math::negative</a> and removed <code>math::toleranceValue()</code>.</li>
<li>Implemented a closest point on line segment algorithm, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1math.html#aa20c570b63722c2f4373712fd462a404">math::closestPointOnSegmentToPoint</a>.</li>
<li>Fixed meshing issues relating to masking and automatic partitioning.</li>
<li><a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html#adf11d9e6e826c6ce03707c950c5c4930">Grid::merge</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a2ba5f332b68e4a1ebba9dbf4b95ec807">Tree::merge</a> now accept an optional <a class="el" href="namespaceopenvdb_1_1v2__1__0.html#ade9c95ac55c647839e6f3e9b462c0575">MergePolicy</a> argument that specifies one of three new merging schemes. (The old merging scheme, which is no longer available, used logic for each tree level that was inconsistent with the other levels and that could result in active tiles being replaced with nodes having only inactive values.)</li>
<li>Renamed <code>LeafNode::coord2offset()</code>, <code>LeafNode::offset2coord()</code> and <code>LeafNode::offset2globalCoord()</code> to <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafNode.html#a87e51328d0a2a73ad0bea8ba1a8c4b55">coordToOffset</a>, <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafNode.html#a0780d59f892d82bf5fab713b6991a9ce">offsetToLocalCoord</a>, and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafNode.html#a79eb1621afd1bcf8ca45386b04a839bb">offsetToGlobalCoord</a>, respectively, and likewise for <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1InternalNode.html#a79eb1621afd1bcf8ca45386b04a839bb">InternalNode</a>. <em>[Thanks to Rick Hankins for suggesting this change.]</em></li>
<li>Replaced <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html">Tree</a> methods <code>setValueOnMin</code>, <code>setValueOnMax</code> and <code>setValueOnSum</code> with <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#adbdcf782cb40fcb514524737e2f8e070">tools::setValueOnMin</a>, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a7c76dc587d3f1735c0113f04ace2f257">tools::setValueOnMax</a> and <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a92d1e43e1896e1a7fa9548c4fd4a2988">tools::setValueOnSum</a> (and a new <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a2fa019501d9dddd1891421935c31efba">tools::setValueOnMult</a>) and added <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#aa6954a428c0ef18a03431f251f4e7d24">Tree::modifyValue</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a5cb69af7e17c3a9a6d6dc360c878448c">Tree::modifyValueAndActiveState</a>, which modify voxel values in-place via user-supplied functors. Similarly, replaced <code><a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a92d1e43e1896e1a7fa9548c4fd4a2988" title="Set the value of the voxel at the given coordinates in tree to the sum of its current value and value...">ValueAccessor::setValueOnSum()</a></code> with <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1ValueAccessor.html#aa6954a428c0ef18a03431f251f4e7d24">ValueAccessor::modifyValue</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1ValueAccessor.html#a5cb69af7e17c3a9a6d6dc360c878448c">ValueAccessor::modifyValueAndActiveState</a>, and added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1TreeValueIteratorBase.html#a3cc3619337daed341d5243d870987bad">modifyValue</a> method to all value iterators.</li>
<li>Removed <code>LeafNode::addValue</code> and <code>LeafNode::scaleValue</code>.</li>
<li>Added convenience classes <a class="el" href="structopenvdb_1_1v2__1__0_1_1tree_1_1Tree3.html">tree::Tree3</a> and <a class="el" href="structopenvdb_1_1v2__1__0_1_1tree_1_1Tree5.html">tree::Tree5</a> for custom tree configurations.</li>
<li>Added an option to the From Particles SOP to generate an alpha mask, which can be used to constrain level set filtering so as to preserve surface details.</li>
<li>The mesh to volume converter now handles point-degenerate polygons.</li>
<li>Fixed a bug in the Level Set Smooth, Level Set Renormalize and Level Set Offset SOPs that caused the group name to be ignored.</li>
<li>Fixed various OS X and Windows build issues. <em>[Contributions from SESI and DD]</em></li>
</ul>
</dd></dl>
<a name="v1_2_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 1.2.0</b> - <em>June 28 2013</em><ul>
<li><a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetFilter.html">Level set filters</a> now accept an optional alpha mask grid.</li>
<li>Implemented sharp feature extraction for level set surfacing. This enhances the quality of the output mesh and reduces aliasing artifacts.</li>
<li>Added masking options to the meshing tools, as well as a spatial multiplier for the adaptivity threshold, automatic partitioning, and the ability to preserve edges and corners when mesh adaptivity is applied.</li>
<li>The mesh to volume attribute transfer scheme now takes surface orientation into account, which improves accuracy in proximity to edges and corners.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafManager.html#a449355fc31ee41387283def6d663f807">foreach</a> method to <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafManager.html">tree::LeafManager</a> that, like <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#ada1c7e219f36d148510ce22d7599171b">tools::foreach</a>, applies a user-supplied functor to each leaf node in parallel.</li>
<li>Rewrote the particle to level set converter, simplifying the API, improving performance (especially when particles have a fixed radius), adding the capability to transfer arbitrary point attributes, and fixing a velocity trail bug.</li>
<li>Added utility methods <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1math.html#abd6c5f1432e0ecbf361331fa5065061a">Sign</a>, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1math.html#a3fac8c76903cbc927c06228fccc335f6">SignChange</a>, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1math.html#aa54dea56ca354a1e4ba46b9589088f84">isApproxZero</a>, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1math.html#a3fb97fe7d04fe6d5e13da8978f5f55ad">Cbrt</a> and <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1math.html#a822ceb92fc74f4e30a888980319f9711">ZeroCrossing</a> to <a class="el" href="Math_8h.html" title="General-purpose arithmetic and comparison routines, most of which accept arbitrary value types (or at...">math/Math.h</a>.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1ValueAccessor3.html#ab1f0b235067a11fd0a6a03f48573723c">probeNode</a> method to the value accessor and to tree nodes that returns a pointer to the node that contains a given voxel.</li>
<li>Deprecated <code>LeafNode::addValue</code> and <code>LeafNode::scaleValue</code>.</li>
<li>Doubled the speed of the mesh to volume converter (which also improves the performance of the fracture and level set rebuild tools) and improved its inside/outside voxel classification near edges and corners.</li>
<li><a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1GridSampler.html">GridSampler</a> now accepts either a grid, a tree or a value accessor, and it offers faster index-based access methods and much better performance in cases where many instances are allocated.</li>
<li>Extended <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1Dense.html">tools::Dense</a> to make it more compatible with existing tools.</li>
<li>Fixed a crash in <a class="el" href="classopenvdb_1_1v2__1__0_1_1io_1_1Archive.html">io::Archive</a> whenever the library was unloaded from memory and then reloaded. <em>[Contributed by Ollie Harding]</em></li>
<li>Fixed a bug in <code>GU_PrimVDB::buildFromPrimVolume()</code>, seen during the conversion from Houdini volumes to OpenVDB grids, that could cause signed flood fill to be applied to non-level set grids, resulting in active tiles with incorrect values.</li>
<li>Added a Prune SOP with several pruning schemes.</li>
</ul>
</dd></dl>
<a name="v1_1_1_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 1.1.1</b> - <em>May 10 2013</em><ul>
<li>Added a simple <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1Dense.html">dense grid class</a> and tools to copy data from dense voxel arrays into OpenVDB grids and vice-versa.</li>
<li>Starting with Houdini 12.5.396, plugins built with this version of OpenVDB can coexist with native Houdini OpenVDB nodes.</li>
<li>The level set fracture tool now smooths seam line edges during mesh extraction, eliminating staircase artifacts.</li>
<li>Significantly improved the performance of the <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1util.html#a5321ecd94e081fef03949028455a5c6d">leafTopologyIntersection</a> and <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1util.html#ad4e70e746d2e7a50f86aaa7ba03a601a">leafTopologyDifference</a> utilities and added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafNode.html#a360f3f39eb6d02f55b36697c5b5c2d14">LeafNode::topologyDifference</a> method.</li>
<li>Added convenience functions that provide simplified interfaces to the <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a49d6517666da8e1ec1175651ebf12f32">mesh to volume</a> and <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a2641c8c08ca3ed3bf4cea4d9b52434b5">volume to mesh</a> converters.</li>
<li>Added a <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a8e31fdabdae973490731a7be4f31d9ad">tools::accumulate</a> function that is similar to <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#ada1c7e219f36d148510ce22d7599171b">tools::foreach</a> but can be used to accumulate the results of computations over the values of a grid.</li>
<li>Added <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a0298e9e5b5b3a443d321bd24825f1d5a">tools::statistics</a>, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a35876c2d474f3ed28fc6a6aa4b4f5678">tools::opStatistics</a> and <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a705b035d27c69d566009424697c36a65">tools::histogram</a>, which efficiently compute statistics (mean, variance, etc.) and histograms of grid values (using <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1Stats.html">math::Stats</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1Histogram.html">math::Histogram</a>).</li>
<li>Modified <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1CoordBBox.html">CoordBBox</a> to adhere to TBB’s splittable type requirements, so that, for example, a <code>CoordBBox</code> can be used as a blocked iteration range.</li>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a75454b135a1e19473aa702a90fd00802">Tree::addTile</a>, <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a2472aeb0b603a8798850208d147579d9">Tree::addLeaf</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a0f336548f0b7d3e0debadf68d43602b6">Tree::stealNode</a>, for fine control over tree construction.</li>
<li>Addressed a numerical stability issue when performing Gaussian filtering of level set grids.</li>
<li>Changed the return type of <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1CoordBBox.html#a5226e1e3ee32005e374d1e8f31a659f4">CoordBBox::volume</a> to reduce the risk of overflow.</li>
<li>When the input mesh is self-intersecting, the mesh to volume converter now produces a level set with a monotonic gradient field.</li>
<li>Fixed a threading bug in the mesh to volume converter that caused it to produce different results for the same input.</li>
<li>Fixed a bug in the particle to level set converter that prevented particles with zero velocity from being rasterized in Trail mode.</li>
<li>Added an optional input to the Create SOP into which to merge newly-created grids.</li>
<li>Fixed a bug in the Resample SOP that caused it to produce incorrect narrow-band widths when resampling level set grids.</li>
<li>Fixed a bug in the To Polygons SOP that caused intermittent crashes when the optional reference input was connected.</li>
<li>Fixed a bug in the Advect Level Set SOP that caused a crash when the velocity input was connected but empty.</li>
<li>The Scatter and Sample Point SOPs now warn instead of erroring when given empty grids.</li>
<li>Fixed a crash in <code>vdb_view</code> when stepping through multiple grids after changing render modes.</li>
<li><code>vdb_view</code> can now render fog volumes and vector fields, and it now features interactively adjustable clipping planes that enable one to view the interior of a volume.</li>
</ul>
</dd></dl>
<a name="v1_1_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 1.1.0</b> - <em>April 4 2013</em><ul>
<li>The <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#ae190c2befe2b252b8d930bd632964ab7">resampleToMatch</a> tool, the Resample SOP and the Combine SOP now use level set rebuild to correctly and safely resample level sets. Previously, scaling a level set would invalidate the signed distance field, leading to holes and other artifacts.</li>
<li>Added a mask-based topological <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#ac2318a73743fa16936e7f3d1ec2ab755">erosion tool</a>, and rewrote and simplified the <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a871caa5e228af49a7e87984e4e281ee0">dilation tool</a>.</li>
<li>The <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetAdvection.html">LevelSetAdvection</a> tool can now advect forward or backward in time.</li>
<li><a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#afc93aa77513426d5aa01be4f4a404489">Tree::pruneLevelSet</a> now replaces each pruned node with a tile having the inside or outside background value, instead of arbitrarily selecting one of the node’s tile or voxel values.</li>
<li>When a grid is saved to a file with <a class="el" href="classopenvdb_1_1v2__1__0_1_1GridBase.html#ac838a0e531771a0328984635524dcaf6">saveFloatAsHalf</a> set to <code>true</code>, the grid’s background value is now also quantized to 16 bits. (Not quantizing the background value caused a mismatch with the values of background tiles.)</li>
<li>As with <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#ada1c7e219f36d148510ce22d7599171b">tools::foreach</a>, it is now possible to specify whether functors passed to <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#ae870e81ce652b9c057d92dbe4b4b9811">tools::transformValues</a> should be shared across threads.</li>
<li><a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafManager.html">tree::LeafManager</a> can now be instantiated with a <code>const</code> tree, although buffer swapping with <code>const</code> trees is disabled.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html#a0c8715267dc1c3b3a4a5a2e9ff620095">Grid::signedFloodFill</a> overload that allows one to specify inside and outside values.</li>
<li>Fixed a bug in <a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html#ac28be27082cf8eaebd695b83e30eeb6f">Grid::setBackground</a> so that now only the values of inactive voxels change.</li>
<li>Fixed <a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html#afb09afd9d023da4b1dae7a140af6848a">Grid::topologyUnion</a> so that it actually unions tree topology, instead of just the active states of tiles and voxels. The previous behavior broke multithreaded code that relied on input and output grids having compatible tree topology.</li>
<li><a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1Transform.html">math::Transform</a> now includes an <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1Transform.html#a800851025d068929cc2d3f895cd6d630">isIdentity</a> predicate and methods to <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1Transform.html#adfb2cf25ab2e2d86da604c83fac6ff13">pre-</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1Transform.html#a548d9f1c7b9af3790c9b8658222f33a5">postmultiply</a> by a matrix.</li>
<li>Modified the <a class="el" href="NodeMasks_8h.html">node mask</a> classes to permit octree-like tree configurations (i.e., with a branching factor of two) and to use 64-bit operations instead of 32-bit operations.</li>
<li>Implemented a new, more efficient <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1math.html#aa77f52a4c2ae34c630bc31df447d5b7e">closest point on triangle</a> algorithm.</li>
<li>Implemented a new vertex normal scheme in the volume to mesh converter, and resolved some overlapping polygon issues.</li>
<li>The volume to mesh converter now meshes not just active voxels but also active tiles.</li>
<li>Fixed a bug in the mesh to volume converter that caused unsigned distance field conversion to produce empty grids.</li>
<li>Fixed a bug in the level set fracture tool whereby the cutter overlap toggle was ignored.</li>
<li>Fixed an infinite loop bug in <code>vdb_view</code>.</li>
<li>Updated <code>vdb_view</code> to use the faster and less memory-intensive OpenVDB volume to mesh converter instead of marching cubes, and rewrote the shader to be OpenGL 3.2 and GLSL 1.2 compatible.</li>
<li>Given multiple input files or a file containing multiple grids, <code>vdb_view</code> now displays one grid at a time. The left and right arrow keys cycle between grids.</li>
<li>The To Polygons SOP now has an option to associate the input grid’s name with each output polygon.</li>
</ul>
</dd></dl>
<a name="v1_0_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 1.0.0</b> - <em>March 14 2013</em><ul>
<li><a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a42ea3c773bf61480206095e14bb62238">tools::levelSetRebuild</a> now throws an exception when given a non-scalar or non-floating-point grid.</li>
<li>The tools in <a class="el" href="GridOperators_8h.html" title="Applies an operator on an input grid to produce an output grid with the same topology but potentially...">tools/GridOperators.h</a> are now interruptible, as is the Analysis SOP.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafManager_1_1LeafRange_1_1Iterator.html">leaf node iterator</a> and a TBB-compatible <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafManager_1_1LeafRange.html">range class</a> to the LeafManager.</li>
<li>Modified the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1VolumeToMesh.html">VolumeToMesh</a> tool to handle surface topology issues around fracture seam lines.</li>
<li>Modified the Makefile to allow <code>vdb_view</code> to compile on OS X systems (provided that GLFW is available).</li>
<li>Fixed a bug in the Create SOP that resulted in "invalid parameter name" warnings.</li>
<li>The Combine SOP now optionally resamples the A grid into the B grid’s index space (or vice-versa) if the A and B transforms differ.</li>
<li>The Vector Split and Vector Merge SOPs now skip inactive voxels by default, but they can optionally be made to include inactive voxels, as they did before.</li>
<li>The <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetFracture.html">LevelSetFracture</a> tool now supports custom rotations for each cutter instance, and the Fracture SOP now uses quaternions to generate uniformly-distributed random rotations.</li>
</ul>
</dd></dl>
<a name="v0_104_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.104.0</b> - <em>February 15 2013</em><ul>
<li>Added a <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a42ea3c773bf61480206095e14bb62238">tool</a> and a SOP to rebuild a level set from any scalar volume.</li>
<li><code></code>.vdb files are now saved using a mask-based compression scheme that is an order of magnitude faster than Zip and produces comparable file sizes for level set and fog volume grids. (Zip compression is still enabled by default for other classes of grids).</li>
<li>The <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1Filter.html">Filter</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetFilter.html">LevelSetFilter</a> tools now include a Gaussian filter, and mean (box) filtering is now 10-50x faster.</li>
<li>The isosurface <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1VolumeToMesh.html">meshing tool</a> is now more robust (to level sets with one voxel wide narrow bands, for example).</li>
<li>Mesh to volume conversion is on average 1.5x faster and up to 5.5x faster for high-resolution meshes where the polygon/voxel size ratio is small.</li>
<li>Added <a class="el" href="namespaceopenvdb_1_1v2__1__0.html#ab5fa070ff38ad858c9b4b61fca2a4a76">createLevelSet</a> and <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a3a2625fb8ecc82eeb5f5e9b0a32eea6f">createLevelSetSphere</a> factory functions for level set grids.</li>
<li><a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1ValueAccessor.html">tree::ValueAccessor</a> is now faster for trees of height 2, 3 and 4 (the latter is the default), and it now allows one to specify, via a template argument, the number of node levels to be cached, which can also improve performance in special cases.</li>
<li>Added a toggle to <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#ada1c7e219f36d148510ce22d7599171b">tools::foreach</a> to specify whether or not the functor should be shared across threads.</li>
<li>Added <a class="el" href="namespaceopenvdb_1_1v2__1__0.html#aeb18227765214253b36604920903430c">Mat4s</a> and <a class="el" href="namespaceopenvdb_1_1v2__1__0.html#aa82b216527004b9571c1d0dfbb8fe9b1">Mat4d</a> metadata types.</li>
<li>Added explicit pre- and postmultiplication methods to the <code>Transform</code>, <code>Map</code> and <code>Mat4</code> classes and deprecated the old accumulation methods.</li>
<li>Modified <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1NonlinearFrustumMap.html">NonlinearFrustumMap</a> to be more compatible with Houdini’s frustum transform.</li>
<li>Fixed a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1GridTransformer.html">GridTransformer</a> bug that caused it to translate the output grid incorrectly in some cases.</li>
<li>Fixed a bug in the tree-level <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafIteratorBase.html">LeafIterator</a> that resulted in intermittent crashes in <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a871caa5e228af49a7e87984e4e281ee0">tools::dilateVoxels</a>.</li>
<li>The <code>Hermite</code> data type and Hermite grids are no longer supported.</li>
<li>Added <a class="el" href="GridOperators_8h.html" title="Applies an operator on an input grid to produce an output grid with the same topology but potentially...">tools/GridOperators.h</a>, which includes new, cleaner implementations of the <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#aea23457a3376d6fb611bd3f46fdffd61">closest point transform</a>, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a1d7270767850c4f3241bce09b730d84a">curl</a>, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#ad9d4adc505e30de4684d20efdcb66512">divergence</a>, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a61d4d89cd34db1794e9a615dec11dc0f">gradient</a>, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#af55f3361b55d27809c1da5bf33db393a">Laplacian</a>, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a9370eee6dbb6de354a68a54b9cdd1dba">magnitude</a>, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a5ad8501c4e8a1e0f613d880f3431d6ca">mean curvature</a> and <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#af5c0227e6c84797a06542df58c2b564d">normalize</a> tools.</li>
<li>Interrupt support has been improved in several tools, including <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1ParticlesToLevelSet.html">tools::ParticlesToLevelSet</a>.</li>
<li>Simplified the API of the <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1BaseStencil.html">Stencil</a> class and added an <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1BaseStencil.html#a4b2c9891717a31845694db27546f0d5a">intersects</a> method to test for intersection with a specified isovalue.</li>
<li>Renamed <code>voxelDimensions</code> to <code>voxelSize</code> in transform classes and elsewhere.</li>
<li>Deprecated <code>houdini_utils::ParmFactory::setChoiceList</code> in favor of <code>houdini_utils::ParmFactory::setChoiceListItems</code>, which requires a list of <em>token, label</em> string pairs.</li>
<li>Made various changes for Visual C++ compatibility. <em>[Contributed by SESI]</em></li>
<li>Fixed a bug in <code>houdini_utils::getNodeChain()</code> that caused the Offset Level Set, Smooth Level Set and Renormalize Level Set SOPs to ignore frame changes. <em>[Contributed by SESI]</em></li>
<li>The From Particles SOP now provides the option to write into an existing grid.</li>
<li>Added a SOP to edit grid metadata.</li>
<li>The Fracture SOP now supports multiple cutter objects.</li>
<li>Added a To Polygons SOP that complements the Fracture SOP and allows for elimination of seam lines, generation of correct vertex normals and grouping of polygons when surfacing fracture fragments, using the original level set or mesh as a reference.</li>
</ul>
</dd></dl>
<a name="v0_103_1_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.103.1</b> - <em>January 15 2013</em><ul>
<li><a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1ValueAccessor.html">tree::ValueAccessor</a> read operations are now faster for four-level trees. (Preliminary benchmark tests suggest a 30-40% improvement.)</li>
<li>For vector-valued grids, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a6e06fdbb69917492f3706fd07ead8adb">tools::compMin</a> and <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#acf57bff918cf1f0be98f38a9fa18cce6">tools::compMax</a> now compare vector magnitudes instead of individual components.</li>
<li>Migrated grid sampling code to a new file, <a class="el" href="Interpolation_8h.html">Interpolation.h</a>, and deprecated old files and classes.</li>
<li>Added a level-set <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetFracture.html">fracture tool</a> and a Fracture SOP.</li>
<li>Added <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#adf5866aca226bc3210df915d3671116f">tools::sdfInteriorMask</a>, which creates a mask of the interior region of a level set grid.</li>
<li>Fixed a bug in the mesh to volume converter that produced unexpected nonzero values for voxels at the intersection of two polygons, and another bug that produced narrow-band widths that didn’t respect the background value when the half-band width was less than three voxels.</li>
<li><code>houdini_utils::ParmFactory</code> can now correctly generate ramp multi-parms.</li>
<li>Made various changes for Visual C++ compatibility. <em>[Contributed by SESI]</em></li>
<li>The Convert SOP can now convert between signed distance fields and fog volumes and from volumes to meshes. <em>[Contributed by SESI]</em></li>
<li>For level sets, the From Mesh and From Particles SOPs now match the reference grid’s narrow-band width.</li>
<li>The Scatter SOP can now optionally scatter points in the interior of a level set.</li>
</ul>
</dd></dl>
<a name="v0_103_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.103.0</b> - <em>December 21 2012</em><ul>
<li>The mesh to volume converter is now 60% faster at generating level sets with wide bands, and the From Mesh SOP is now interruptible.</li>
<li>Fixed a threading bug in the recently-added <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#ae407286d51064dc0f07b441dab49798e">compReplace</a> tool that caused it to produce incorrect output.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a5730e3a8bc07b016c9c4f95f62651e32">probeConstLeaf</a> method to the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a5730e3a8bc07b016c9c4f95f62651e32">Tree</a>, <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1ValueAccessor.html#a4a86e7d65de16a43a7b1eef5c5da1033">ValueAccessor</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1RootNode.html#ab0e736a8c396807bd2643176d6e7beee">node</a> classes.</li>
<li>The Houdini VDB primitive doesn’t create a <code>name</code> attribute unnecessarily (i.e., if its grid’s name is empty), but it now correctly allows the name to be changed to the empty string.</li>
<li>Fixed a crash in the Vector Merge SOP when fewer than three grids were merged.</li>
<li>The From Particles SOP now features a "maximum half-width" parameter to help avoid runaway computations.</li>
</ul>
</dd></dl>
<a name="v0_102_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.102.0</b> - <em>December 13 2012</em><ul>
<li>Added <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#ae407286d51064dc0f07b441dab49798e">tools::compReplace</a>, which copies the active values of one grid into another, and added a "Replace A With Active B" mode to the Combine SOP.</li>
<li><a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html#a0c8715267dc1c3b3a4a5a2e9ff620095">Grid::signedFloodFill</a> no longer enters an infinite loop when filling an empty grid.</li>
<li>Fixed a bug in the particle to level set converter that sometimes produced level sets with holes, and fixed a bug in the SOP that could result in random output.</li>
<li>Fixed an issue in the frustum preview feature of the Create SOP whereby rendering very large frustums could cause high CPU usage.</li>
<li>Added streamline support to the constrained advection scheme in the Advect Points SOP.</li>
<li>Added an Advect Level Set SOP.</li>
</ul>
</dd></dl>
<a name="v0_101_1_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.101.1</b> - <em>December 11 2012</em> (DWA internal release)<ul>
<li>Partially reverted the Houdini VDB primitive’s grid accessor methods to their pre-0.98.0 behavior. A primitive’s grid can once again be accessed by shared pointer, but now also by reference. Accessor methods for grid metadata have also been added, and the primitive now ensures that metadata and transforms are never shared.</li>
<li>Fixed an intermittent crash in the From Particles SOP.</li>
</ul>
</dd></dl>
<a name="v0_101_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.101.0</b> - <em>December 6 2012</em> (DWA internal release)<ul>
<li>Partially reverted the <a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html">Grid</a>’s <a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html#a9041f381eeb1287165c1287603de9663">tree</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1GridBase.html#a29489066f0a6b234e780dad3322f4040">transform</a> accessor methods to their pre-0.98.0 behavior, eliminating copy-on-write but preserving their return-by-reference semantics. These methods are now supplemented with a suite of <a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html#adc47070164ba764f5afe561998f88f17">shared</a> <a class="el" href="classopenvdb_1_1v2__1__0_1_1GridBase.html#ade901fd5fd57d7fd89e6f5e5e2625105">pointer</a> <a class="el" href="classopenvdb_1_1v2__1__0_1_1GridBase.html#aaeef9292b7aa4fd419dcdf4c83ede12c">accessors</a>.</li>
<li>Restructured the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1MeshToVolume.html">mesh to volume converter</a> for a 40% speedup and to be more robust to non-manifold geometry, to better preserve sharp features, to support arbitrary tree configurations and to respect narrow-band limits.</li>
<li>Added a <code>getNodeBoundingBox</code> method to <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1RootNode.html#a00265a6f2e4bb7edf268ce430744f410">RootNode</a>, <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1InternalNode.html#a6051e4ba75b59a01e4d0e91ba9786070">InternalNode</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafNode.html#a6051e4ba75b59a01e4d0e91ba9786070">LeafNode</a> that returns the index space spanned by a node.</li>
<li>Made various changes for Visual C++ compatibility. <em>[Contributed by SESI]</em></li>
<li>Renamed the Reshape Level Set SOP to Offset Level Set.</li>
<li>Fixed a crash in the Convert SOP and added support for conversion of empty grids.</li>
</ul>
</dd></dl>
<a name="v0_100_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.100.0</b> - <em>November 30 2012</em> (DWA internal release)<ul>
<li>Greatly improved the performance of the level set to fog volume <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#aad82d1b0039598209bc21cd9aa4511a0">converter</a>.</li>
<li>Improved the performance of the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1Filter.html#a289cdc97474dd92e10951f348787ee31">median filter</a> and of level set <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a63ca059a52fa4df11baa7f641a1e3611">CSG</a> operations.</li>
<li>Reintroduced <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#afc93aa77513426d5aa01be4f4a404489">Tree::pruneLevelSet</a>, a specialized <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#ae9fc992cff323b6564e24b18ecc3f6da">pruneInactive</a> for level-set grids.</li>
<li>Added utilities to the <code>houdini_utils</code> library to facilitate the collection of a chain of adjacent nodes of a particular type so that they can be cooked in a single step. (For example, adjacent <code>xform</code> SOPs could be collapsed by composing their transformation matrices into a single matrix.)</li>
<li>Added pruning and flood-filling options to the Convert SOP.</li>
<li>Reimplemented the Filter SOP, omitting level-set-specific filters and adding node chaining (to reduce memory usage when applying several filters in sequence).</li>
<li>Added a toggle to the Read SOP to read grid metadata and transforms only.</li>
<li>Changed the attribute transfer scheme on the From Mesh and From Particles SOPs to allow for custom grid names and vector type metadata.</li>
</ul>
</dd></dl>
<a name="v0_99_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.99.0</b> - <em>November 21 2012</em><ul>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html">Grid</a> methods that return non-<code>const</code> tree and transform references without triggering deep copies, as well as <code>const</code> methods that return <code>const</code> shared pointers.</li>
<li>Added <code>Grid</code> methods to <a class="el" href="classopenvdb_1_1v2__1__0_1_1GridBase.html#a6f6011abaee35f0718424ba281220706">populate</a> a grid’s metadata with statistics like the active voxel count, and to <a class="el" href="classopenvdb_1_1v2__1__0_1_1GridBase.html#aa5dcf695fe75a1b3049d264b06f1bd0a">retrieve</a> that metadata. By default, statistics are now computed and added to grids whenever they are written to <code>.vdb</code> files.</li>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1io_1_1File.html#ab12472377bbdbcab1d0bc3258c76f289">io::File::readGridMetadata</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1io_1_1File.html#abf37aaa82022716eede54e8d58b94c20">io::File::readAllGridMetadata</a> methods to read just the grid metadata and transforms from a <code>.vdb</code> file.</li>
<li>Fixed numerical precision issues in the <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a63ca059a52fa4df11baa7f641a1e3611">csgUnion</a>, <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#ac6851d766bae22bdff30bbc8f9167ab9">csgIntersection</a> and <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a28a450f27165e0dbfa59e79652ae8ec4">csgDifference</a> tools, and added toggles to optionally disable postprocess pruning.</li>
<li>Fixed an issue in <code>vdb_view</code> with the ordering of GL vertex buffer calls. <em>[Contributed by Bill Katz]</em></li>
<li>Fixed an intermittent crash in the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1ParticlesToLevelSet.html">ParticlesToLevelSet</a> tool, as well as a race condition that could cause data corruption.</li>
<li>The <code>ParticlesToLevelSet</code> tool and From Particles SOP can now transfer arbitrary point attribute values from the input particles to output voxels.</li>
<li>Fixed a bug in the Convert SOP whereby the names of primitives were lost during conversion, and another bug that resulted in arithmetic errors when converting empty grids.</li>
<li>Fixed a bug in the Combine SOP that caused the Operation selection to be lost.</li>
</ul>
</dd></dl>
<a name="v0_98_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.98.0</b> - <em>November 16 2012</em><ul>
<li><a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html">Tree</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1Transform.html">Transform</a> objects (and <a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html">Grid</a> objects in the context of Houdini SOPs) are now passed and accessed primarily by reference rather than by shared pointer. See <a class="el" href="api_0_98_0.html">Porting to OpenVDB 0.98.0</a> for details about this important API change. <em>[Contributed by SESI]</em></li>
<li>Reimplemented <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1CoordBBox.html">CoordBBox</a> to address several off-by-one bugs related to bounding box dimensions.</li>
<li>Fixed an off-by-one bug in <a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html#ad7d68edffb50eaaa5075ee7c20934d3f">evalActiveVoxelBoundingBox</a>.</li>
<li>Introduced the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafManager.html">LeafManager</a> class, which will eventually replace the <code>LeafArray</code> class. <code>LeafManager</code> supports dynamic buffers stored as a structure of arrays (SOA), unlike <code>LeafArray</code>, which supports only static buffers stored as an array of structures (AOS).</li>
<li>Improved the performance of the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetFilter.html">LevelSetFilter</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetTracker.html">LevelSetTracker</a> tools by rewriting them to use the new <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafManager.html">LeafManager</a> class.</li>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a63ff695beda11ed9ef625a28ce8a5faf">Tree::setValueOnly</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1ValueAccessor.html#a63ff695beda11ed9ef625a28ce8a5faf">ValueAccessor::setValueOnly</a> methods, which change the value of a voxel without changing its active state, and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a48bab17c2781af76eacbc64ba399e1d7">Tree::probeLeaf</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1ValueAccessor.html#a0b1a8557f5239a416f76dbc2e99dbd82">ValueAccessor::probeLeaf</a> methods that return the leaf node that contains a given voxel (unless the voxel is represented by a tile).</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetAdvection.html">LevelSetAdvection</a> tool that propagates and tracks narrow-band level sets.</li>
<li>Introduced a new <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1GridSampler.html">GridSampler</a> class that supports world-space (or index-space) sampling of grid values.</li>
<li>Changed the interpretation of the <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1NonlinearFrustumMap.html">NonlinearFrustumMap</a>’s <em>taper</em> parameter to be the ratio of the near and far plane depths.</li>
<li>Added a <code>ParmFactory::setChoiceList()</code> overload that accepts (<em>token</em>, <em>label</em>) string pairs, and a <code>setDefault()</code> overload that accepts an STL string.</li>
<li>Fixed a crash in the Combine SOP in Copy B mode.</li>
<li>Split the Level Set Filter SOP into three separate SOPs, Level Set Smooth, Level Set Reshape and Level Set Renormalize. When two or more of these nodes are connected in sequence, they interact to reduce memory usage: the last node in the sequence performs all of the operations in one step.</li>
<li>The Advect Points SOP can now output polyline streamlines that trace the paths of the points.</li>
<li>Added an option to the Analysis SOP to specify names for output grids.</li>
<li>Added camera-derived frustum transform support to the Create SOP.</li>
</ul>
</dd></dl>
<a name="v0_97_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.97.0</b> - <em>October 18 2012</em><ul>
<li>Added a narrow-band <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetTracker.html">level set interface tracking tool</a> (up to fifth-order in space but currently only first-order in time, with higher temporal orders to be added soon).</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1LevelSetFilter.html">level set filter tool</a> to perform unrestricted surface smoothing (e.g., Laplacian flow), filtering (e.g., mean value) and morphological operations (e.g., morphological opening).</li>
<li>Added adaptivity to the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1VolumeToMesh.html">level set meshing tool</a> for faster mesh extraction with fewer polygons, without postprocessing.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1ValueAccessor.html#a0d19cd16b0f5919fd95ce5ab20984a2b">ValueAccessor::touchLeaf</a> method that creates (if necessary) and returns the leaf node containing a given voxel. It can be used to preallocate leaf nodes over which to run parallel algorithms.</li>
<li>Fixed a bug in <a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html#adf11d9e6e826c6ce03707c950c5c4930">Grid::merge</a> whereby active tiles were sometimes lost.</li>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafManager.html">LeafManager</a>, which is similar to <code>LeafArray</code> but supports a dynamic buffer count and allocates buffers more efficiently. Useful for temporal integration (e.g., for level set propagation and interface tracking), <code>LeafManager</code> is meant to replace <code>LeafArray</code>, which will be deprecated in the next release.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafNode.html#aa5d88c3fde0d2d51d27cf6c5e995682e">LeafNode::fill</a> method to efficiently populate leaf nodes with constant values.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#afd30b68bce6aa6ec6de2441d995a5f56">Tree::visitActiveBBox</a> method that applies a functor to the bounding boxes of all active tiles and leaf nodes and that can be used to improve the performance of ray intersection tests, rendering of bounding boxes, etc.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#af5e9f0b95e0c90fb67993a859186ac0e">Tree::voxelizeActiveTiles</a> method to densify active tiles. While convenient and fast, this can produce large dense grids, so use it with caution.</li>
<li>Repackaged <code>Tree::pruneLevelSet()</code> as a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#ac671fd3e7b76eabb7a89795fe28b31ed">Tree::pruneOp()</a>-compatible functor. <a class="el" href="structopenvdb_1_1v2__1__0_1_1tree_1_1LevelSetPrune.html">LevelSetPrune</a> is a specialized <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#ae9fc992cff323b6564e24b18ecc3f6da">pruneInactive</a> for level-set grids and is used in interface tracking.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1GridBase.html#a946aadf4f9405301582b15976dc8494f">GridBase::pruneGrid</a> method.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1GridBase.html#acabf3f247f64b7dcef84c32c8372fc04">Grid:hasUniformVoxels</a> method.</li>
<li>Renamed <code>tools::dilate</code> to <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#a871caa5e228af49a7e87984e4e281ee0">dilateVoxels</a> and improved its performance. The new name reflects the fact that the current implementation ignores active tiles.</li>
<li>Added a <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#ae190c2befe2b252b8d930bd632964ab7">tools::resampleToMatch</a> function that resamples an input grid into an output grid with a different transform such that, after resampling, the input and output grids coincide, but the output grid’s transform is preserved.</li>
<li>Significantly improved the performance of depth-bounded value iterators (<a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a2bc8a326316be76b916b32302506f427">ValueOnIter</a>, <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a3679e9e0ab166205346c3aee0f853108">ValueAllIter</a>, etc.) when the depth bound excludes leaf nodes.</li>
<li>Exposed the value buffers inside leaf nodes with <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafNode.html#a6e4d32cef58578c6471ad6c3dd0db7d3">LeafNode::buffer</a>. This allows for very fast access (const and non-const) to voxel values using linear array offsets instead of <img class="formulaInl" alt="$(i,j,k)$" src="form_51.png"/> coordinates.</li>
<li>In openvdb_houdini/UT_VDBTools.h, added operators for use with <code>processTypedGrid</code> that resample grids in several different ways.</li>
<li>Added a policy mechanism to <code>houdini_utils::OpFactory</code> that allows for customization of operator names, icons, and Help URLs.</li>
<li>Renamed many of the Houdini SOPs to make the names more consistent.</li>
<li>Added an Advect Points SOP.</li>
<li>Added a Level Set Filter SOP that allows for unrestricted surface deformations, unlike the older Filter SOP, which restricts surface motion to the initial narrow band.</li>
<li>Added staggered vector sampling to the Sample Points SOP.</li>
<li>Added a minimum radius threshold to the particle voxelization tool and SOP.</li>
<li>Merged the Composite and CSG SOPs into a single Combine SOP.</li>
<li>Added a tool and a SOP to efficiently generate narrow-band level set representations of spheres.</li>
<li>In the Visualize SOP, improved the performance of tree topology generation, which is now enabled by default.</li>
</ul>
</dd></dl>
<a name="v0_96_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.96.0</b> - <em>September 24 2012</em><ul>
<li>Fixed a memory corruption bug in the mesh voxelizer tool.</li>
<li>Temporarily removed the optional clipping feature from the level set mesher.</li>
<li>Added "Staggered Vector Field" to the list of grid classes in the Create SOP.</li>
</ul>
</dd></dl>
<a name="v0_95_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.95.0</b> - <em>September 20 2012</em><ul>
<li>Added a quad <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1VolumeToMesh.html">meshing</a> tool for higher-quality level set meshing and updated the Visualizer SOP to use it.</li>
<li>Fixed a precision error in the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1MeshToVolume.html">mesh voxelizer</a> and improved the quality of inside/outside voxel classification. Output grids are now also <a class="el" href="classopenvdb_1_1v2__1__0_1_1GridBase.html#a60f870194239aba95a3a0a01597d391a">classified</a> as either level sets or fog volumes.</li>
<li>Modified the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1GridResampler.html">GridResampler</a> to use the signed flood fill optimization only on grids that are tagged as level sets.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1Quat.html">quaternion</a> class to the math library and a method to return the <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1Mat3.html#a1d9030d1459f91027741424a262d31fd">trace</a> of a <code>Mat3</code>.</li>
<li>Fixed a bug in the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1ValueAccessor.html#aebc7997cdda9421399e1075894bb5d38">ValueAccessor</a> copy constructor that caused the copy to reference the original.</li>
<li>Fixed a bug in <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1RootNode.html#a7b3e82eb582914ac6f31f32fea77292f">RootNode::setActiveState</a> that caused a crash when marking a (virtual) background voxel as inactive.</li>
<li>Added a <code>Tree::pruneLevelSet</code> method that is similar to but faster than <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#ae9fc992cff323b6564e24b18ecc3f6da">pruneInactive</a> for level set grids.</li>
<li>Added fast leaf node voxel access <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1LeafNode.html#a525333c1fa4eb845ef57df546aaf24af">methods</a> that index by linear offset (as returned by <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1IteratorBase.html#aa7079339b0d8f4039d67a7e8a25c190e">ValueIter::pos</a>) instead of by <img class="formulaInl" alt="$(i,j,k)$" src="form_51.png"/> coordinates.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a4b094186577cde9b7ad1f326389c815f">Tree::touchLeaf</a> method that can be used to preallocate a static tree topology over which to safely perform multithreaded processing.</li>
<li>Added a grain size argument to <code>LeafArray</code> for finer control of parallelism.</li>
<li>Modified the Makefile to make it easier to omit the <code>doc</code>, <code>vdb_test</code> and <code>vdb_view</code> targets.</li>
<li>Added utility functions (in <code>houdini/UT_VDBUtils.h</code>) to convert between Houdini and OpenVDB matrix and vector types. <em>[Contributed by SESI]</em></li>
<li>Added accessors to <code>GEO_PrimVDB</code> that make it easier to directly access voxel data and that are used by the HScript volume expression functions in Houdini 12.5. <em>[Contributed by SESI]</em></li>
<li>As of Houdini 12.1.77, the native transform SOP operates on OpenVDB primitives. <em>[Contributed by SESI]</em></li>
<li>Added a Convert SOP that converts OpenVDB grids to Houdini volumes and vice-versa.</li>
</ul>
</dd></dl>
<a name="v0_94_1_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.94.1</b> - <em>September 7 2012</em><ul>
<li>Fixed bugs in <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1RootNode.html">RootNode</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1InternalNode.html">InternalNode</a> <code>setValue*</code>() and <code>fill()</code> methods that could cause neighboring voxels to become inactive.</li>
<li>Fixed a bug in <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#ae4fd665aa748fe753c256bbbb6ff31d0">Tree::hasSameTopology</a> that caused false positives when only active states and not values differed.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a1e1a133192d9d344c482d4aa83f6da33">Tree::hasActiveTiles</a> method.</li>
<li>For better cross-platform consistency, substituted bitwise AND operations for right shifts in the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1ValueAccessor.html">ValueAccessor</a> hash key computation.</li>
<li><code>vdb_view</code> no longer aborts when asked to surface a vector-valued grid—but it still doesn’t render the surface.</li>
<li>Made various changes for Visual C++ compatibility. <em>[Contributed by SESI]</em></li>
<li>Added an option to the MeshVoxelizer SOP to convert both open and closed surfaces to unsigned distance fields.</li>
<li>The Filter SOP now allows multiple filters to be applied in user-specified order.</li>
</ul>
</dd></dl>
<a name="v0_94_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.94.0</b> - <em>August 30 2012</em><ul>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html#afb09afd9d023da4b1dae7a140af6848a">method</a> to union just the active states of voxels from one grid with those of another grid of a possibly different type.</li>
<li>Fixed an incorrect scale factor in the Laplacian diffusion <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#af55f3361b55d27809c1da5bf33db393a">filter</a>.</li>
<li>Fixed a bug in <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a2ba5f332b68e4a1ebba9dbf4b95ec807">Tree::merge</a> that could leave a tree with invalid value accessors.</li>
<li>Added <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1TreeValueIteratorBase.html#a10c9560d1832cadc5ec67c49be2c6380">TreeValueIteratorBase::setActiveState</a> and deprecated <code>setValueOn</code>.</li>
<li>Removed <code>tools/FastSweeping.h</code>. It will be replaced with a much more efficient implementation in the near future.</li>
<li>ZIP compression of <code>.vdb</code> files is now <a class="el" href="classopenvdb_1_1v2__1__0_1_1io_1_1Archive.html#aad88bb49eb45c3a322299000d0021677">optional</a>, but enabled by default. <em>[Contributed by SESI]</em></li>
<li>Made various changes for Clang and Visual C++ compatibility. <em>[Contributed by SESI]</em></li>
<li>The MeshVoxelizer SOP can now transfer arbitrary point and primitive attribute values from the input mesh to output voxels.</li>
</ul>
</dd></dl>
<a name="v0_93_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.93.0</b> - <em>August 24 2012</em><ul>
<li>Renamed symbols in <a class="el" href="Operators_8h.html">math/Operators.h</a> to avoid ambiguities that GCC 4.4 reports as errors.</li>
<li>Simplified the API for the stencil version of the closest-point transform <a class="el" href="structopenvdb_1_1v2__1__0_1_1math_1_1CPT.html">operator</a>.</li>
<li>Added logic to <a class="el" href="classopenvdb_1_1v2__1__0_1_1io_1_1Archive.html#a1feee91a690bf00206d9e3aeebc7b5e2">io::Archive::readGrid</a> to set the grid name metadata from the descriptor if the metadata doesn’t already exist.</li>
<li>Added guards to prevent nesting of <code>openvdb_houdini::Interrupter::start()</code> and <code>end()</code> calls.</li>
</ul>
</dd></dl>
<a name="v0_92_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.92.0</b> - <em>August 23 2012</em><ul>
<li>Added a Laplacian diffusion <a class="el" href="namespaceopenvdb_1_1v2__1__0_1_1tools.html#af55f3361b55d27809c1da5bf33db393a">filter</a>.</li>
<li>Fixed a bug in the initialization of the sparse contour tracer that caused mesh-to-volume conversion to fail in certain cases.</li>
<li>Fixed a bug in the curvature stencil that caused mean curvature filtering to produce wrong results.</li>
<li>Increased the speed of the <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1GridTransformer.html">GridTransformer</a> by as much as 20% for fog volumes.</li>
<li>Added optional pruning to the Resample SOP.</li>
<li>Modified the PointSample SOP to allow it to work with ungrouped, anonymous grids.</li>
<li>Fixed a crash in the LevelSetNoise SOP.</li>
</ul>
</dd></dl>
<a name="v0_91_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.91.0</b> - <em>August 16 2012</em><ul>
<li><a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1GridTransformer.html">tools::GridTransformer</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tools_1_1GridResampler.html">tools::GridResampler</a> now correctly (but not yet efficiently) process tiles in sparse grids.</li>
<li>Added an optional <a class="el" href="namespaceopenvdb_1_1v2__1__0.html#a51a9760605ac8e44f3479429f911dad5">CopyPolicy</a> argument to <a class="el" href="classopenvdb_1_1v2__1__0_1_1GridBase.html#ae10e2122c71d4714e4aa046acf3732ab">GridBase::copyGrid</a> and to <a class="el" href="classopenvdb_1_1v2__1__0_1_1Grid.html#ac7aa3f019c8503b7b4641477adf0a546">Grid::copy</a> that specifies whether and how the grid’s tree should be copied.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1GridBase.html#a742dad1af803e5c35040cc24868f2d40">GridBase::newTree</a> method that replaces a grid’s tree with a new, empty tree of the correct type.</li>
<li>Fixed a crash in <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a73a6e7c85d37e7d677eddc3cce8aa11b">Tree::setValueOff</a> when the new value was equal to the background value.</li>
<li>Fixed bugs in <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a462c7056adc55d8da2cc5828934ff859">Tree::prune</a> that could result in output tiles with incorrect active states.</li>
<li>Added <code>librt</code> to the link dependencies to address build failures on Ubuntu systems.</li>
<li>Made various small changes to the Makefile and the source code that should help with Mac OS X compatibility.</li>
<li>The Composite and Resample SOPs now correctly copy the input grid’s metadata to the output grid.</li>
</ul>
</dd></dl>
<a name="v0_90_1_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.90.1</b> - <em>August 7 2012</em><ul>
<li>Fixed a bug in the <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1BBox.html#acc39d59e67a9bf472082b89e394051b8">BBox::getCenter()</a> method.</li>
<li>Added missing header files to various files.</li>
<li><a class="el" href="classopenvdb_1_1v2__1__0_1_1io_1_1File_1_1NameIterator.html#a2f95bb0c721fad8fc2ebf49bf290048b">io::File::NameIterator::gridName()</a> now returns a unique name of the form <code>"name[1]"</code>, <code>"name[2]"</code>, etc. if a file contains multiple grids with the same name.</li>
<li>Fixed a bug in the Writer SOP that caused grid names to be discarded.</li>
<li>The Resample SOP now correctly sets the background value of the output grid.</li>
</ul>
</dd></dl>
<a name="v0_90_0_changes"></a> <dl class="section user"><dt></dt><dd><b>Version 0.90.0</b> - <em>August 3 2012</em> (initial public release)<ul>
<li>Added a basic GL viewer for OpenVDB files.</li>
<li>Greatly improved the performance of two commonly-used <code>Tree</code> methods, <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#a957fe86bcd8fb552764ce293ef416d44">evalActiveVoxelBoundingBox()</a> and <a class="el" href="classopenvdb_1_1v2__1__0_1_1tree_1_1Tree.html#aae2d9daf6809e19c51946932dacc9f06">memUsage()</a>.</li>
<li>Eliminated the <code>GridMap</code> class. File I/O now uses STL containers of grid pointers instead.</li>
<li>Refactored stencil-based tools (Gradient, Laplacian, etc.) and rewrote some of them for generality and better performance. Most now behave correctly for grids with nonlinear index-to-world transforms.</li>
<li>Added a <a class="el" href="FiniteDifference_8h.html">library</a> of index-space finite difference operators.</li>
<li>Added a <a class="el" href="classopenvdb_1_1v2__1__0_1_1math_1_1Hermite.html">"Hermite"</a> grid type that compactly stores each voxel’s upwind normals and can be used to convert volumes to and from polygonal meshes.</li>
<li>Added a <a class="el" href="PointScatter_8h.html">tool</a> (and a Houdini SOP) to scatter points randomly throughout a volume. </li>
</ul>
</dd></dl>
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