Sets the texture coordinates for every polygon belonging to the clump using the spherical projection method.
A spherical mapping results in the construction of a nominal sphere onto which the texture is applied in a way similar to the projection of a two dimensional atlas map onto the surface of a globe. The resulting sphere is then mapped to the clump by "shrink wrapping" the clump with the sphere.
clump Pointer to the clump.
The argument clump if successful, and NULL otherwise.
This function need only be called the first time a clump is textured and not each time the clump is rendered.
Note that this function does not set the textures associated with the clumps polygons; this must be accomplished separately. The following code fragment illustrates this procedure:
(RwPolygon3d*( *)())RwSetPolygonTexture, texture);