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/usr/share/Coin/draggerDefaults/trackballDragger.iv is in libcoin80-runtime 3.1.4~abc9f50+dfsg3-2.

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#Inventor V2.1 ascii

# Standard common material definitions.
DEF TRACKBALL_INACTIVE_MATERIAL Material { diffuseColor 0.5 0.5 0.5  emissiveColor 0.5 0.5 0.5 }
DEF TRACKBALL_ACTIVE_MATERIAL Material { diffuseColor 0.5 0.5 0  emissiveColor 0.5 0.5 0 }
DEF TRACKBALL_FEEDBACK_MATERIAL Material { diffuseColor 0.5 0 0.5  emissiveColor 0.5 0 0.5 }
# Additional material definitions for this dragger.
DEF TRACKBALL_USER_INACTIVE_MATERIAL Material { diffuseColor 0 0.7 0.1  emissiveColor 0 0.2 0.1 }
DEF TRACKBALL_USER_ACTIVE_MATERIAL Material { diffuseColor 0 0.8 0.1  emissiveColor 0 0.3 0.1 }


# Common geometry definition for dragger band / ring around the ball.
DEF TRACKBALL_BAND_MARKER Group {
   DrawStyle { style LINES }
   ShapeHints { vertexOrdering UNKNOWN_ORDERING }
   Cylinder { parts SIDES  radius 1.05 height 0.1 }
}


# X, Y and Z bands

DEF trackballXRotator Separator {
   USE TRACKBALL_INACTIVE_MATERIAL
   DEF TRACKBALL_X_BAND Group {
      Rotation { rotation 0 0 1 1.57 }
      USE TRACKBALL_BAND_MARKER
   }
}
DEF trackballXRotatorActive Separator {
   USE TRACKBALL_ACTIVE_MATERIAL
   USE TRACKBALL_X_BAND
}

DEF trackballYRotator Separator {
   USE TRACKBALL_INACTIVE_MATERIAL
   USE TRACKBALL_BAND_MARKER
}
DEF trackballYRotatorActive Separator {
   USE TRACKBALL_ACTIVE_MATERIAL
   USE TRACKBALL_BAND_MARKER
}

DEF trackballZRotator Separator {
   USE TRACKBALL_INACTIVE_MATERIAL
   DEF TRACKBALL_Z_BAND Group {
      Rotation { rotation 1 0 0 1.57 }
      USE TRACKBALL_BAND_MARKER
   }
}
DEF trackballZRotatorActive Separator {
   USE TRACKBALL_ACTIVE_MATERIAL
   USE TRACKBALL_Z_BAND
}


# Geometry for rotation marker with user-defined rotation axis.

DEF TRACKBALL_USER_AXIS Group {
   Coordinate3 { point [ 0 1.5 0, 0 -1.5 0 ] }
   IndexedLineSet { coordIndex [ 0, 1, -1 ] }
}

DEF trackballUserAxis Separator {
   USE TRACKBALL_FEEDBACK_MATERIAL
   USE TRACKBALL_USER_AXIS
}
DEF trackballUserAxisActive Separator {
   USE TRACKBALL_FEEDBACK_MATERIAL
   USE TRACKBALL_USER_AXIS
}

DEF TRACKBALL_DRAGGER_USER_ROTATOR Group {
   Scale { scaleFactor 1.05 1.05 1.05 } # outside the x, y and z bands
   USE TRACKBALL_BAND_MARKER
}

DEF trackballUserRotator Separator {
   USE TRACKBALL_USER_INACTIVE_MATERIAL
   USE TRACKBALL_DRAGGER_USER_ROTATOR
}

DEF trackballUserRotatorActive Separator {
   USE TRACKBALL_USER_ACTIVE_MATERIAL
   USE TRACKBALL_DRAGGER_USER_ROTATOR
}

DEF TRACKBALL_CENTER Separator {
   DrawStyle { style INVISIBLE }
   Sphere { radius 1.02 }
}

DEF trackballRotator Separator { USE TRACKBALL_CENTER }
DEF trackballRotatorActive Separator { USE TRACKBALL_CENTER }