The GroundPlane type exposes the following members.
Height above world XY plane in model units.
Determines whether the ground plane is fixed by the Altitude property, or whether it is automatically placed at the lowest point in the model.
Determines whether the document ground plane is enabled.
Id of material in material table for this ground plane.
Determines whether the ground plane shows the material assigned, or whether it is transparent, but captures shadows.
If this is off, the ground plane will not be visible when seen from below.
Texture mapping offset in world units.
Texture offset locked.
Texture mapping rotation around world origin + offset in degrees.
Texture mapping single UV span size in world units.
Texture size locked.