|Microsoft DirectX 9.0|
Retrieves the flexible vertex format (FVF) of the vertices in the simplification mesh.
Returns an FVF that describes the vertex format of the vertices in the simplification mesh.
This method can return 0 if the vertex format cannot be mapped directly to an FVF code. This will occur for a mesh created from a vertex declaration that doesn't have the same order and elements supported by the FVF codes.