non-transformed S3DMODEL for rendering.
+ S3D_CACHE now caches S3DMODEL and returns a pointer to a single
instance of the S3DMODEL for repeated calls to Prepare()
+ Beginning the VRML Plugin
'GetVersion'.
+ Introduced normal calculations. This is buggy due to multiple equal
face normals distorting the vertex normal; this will be fixed by
removing the redundant face normals from the calculations.