Scol 5.x or above required
Retrieve the type of a 3d object.
fun [S3d H3d] I
Return : I M3_MESH, M3_CAM, M3_LIGHT, M3_SHELL, M3_TOPO, M3_COLL, M3_SPRITE, M3_ANIM, M3_COLOR_LIGHT, M3_PARTICLE, M3_LISTENER or M3_SOUND. nil if an error occurs