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/usr/lib/R/site-library/rgl/INDEX is in r-cran-rgl 0.93.996-1.

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The actual contents of the file can be viewed below.

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.check3d                Check for an open rgl window.
addNormals              Add normal vectors to objects so they render
                        more smoothly.
aspect3d                Set the aspect ratios of the current plot
axes3d                  Draw boxes, axes and other text outside the
                        data
cylinder3d              Create cylindrical or "tube" plots.
ellipse3d               Make an ellipsoid
extrude3d               Generate extrusion mesh
grid3d                  Add a grid to a 3D plot
identify3d              Identify points in plot.
matrices                Work with homogeneous coordinates
mesh3d                  3D Mesh objects
par3d                   Set or Query RGL Parameters
par3dinterp             Interpolator for par3d parameters
persp3d                 Surface plots
play3d                  Play animation of rgl scene
plot3d                  3D Scatterplot
points3d                add primitive set shape
polygon3d               Triangulate and draw a polygon in three
                        dimensions.
r3d                     Generic 3D interface
readSTL                 Read and write STL (stereolithography) format
                        files
rgl-package             3D visualization device system
rgl.Sweave              Integrating 'rgl' with 'Sweave'
rgl.abclines            Lines intersecting the bounding box
rgl.attrib.count        Get information about shapes
rgl.bbox                Set up Bounding Box decoration
rgl.bg                  Set up Background
rgl.bringtotop          Assign focus to an RGL window
rgl.clear               scene management
rgl.light               add light source
rgl.material            Generic Appearance setup
rgl.pixels              Extract pixel information from window
rgl.planes              add planes
rgl.postscript          export screenshot
rgl.primitive           add primitive set shape
rgl.select              Switch to select mode, and return the mouse
                        position selected.
rgl.setMouseCallbacks   User callbacks on mouse events
rgl.snapshot            export screenshot
rgl.spheres             add sphere set shape
rgl.surface             add height-field surface shape
rgl.texts               add text
rgl.useNULL             Report default use of null device.
rgl.user2window         Convert between rgl user and window coordinates
rgl.viewpoint           Set up viewpoint
scene3d                 Saves the current scene to a variable, and
                        displays such variables.
select3d                Select a rectangle in an RGL scene
selectpoints3d          Select points from a scene
shapelist3d             Create and plot a list of shapes
spin3d                  Create a function to spin a scene at a fixed
                        rate
sprites3d               add sprite set shape
subdivision3d           generic subdivision surface method
surface3d               add height-field surface shape
triangulate             Triangulate a two-dimensional polygon.
turn3d                  Create a solid of rotation from a
                        two-dimensional curve.
writeOBJ                Write Wavefront OBJ format files
writePLY                Write Stanford PLY format files
writeWebGL              Write scene to HTML.