Optimized the sphere mesh generator to only recompute the mesh once, even if both v and h res are changed in the same frame.
Optimized the sphere mesh generator to only recompute the mesh once, even
if both v and h res are changed in the same frame.

vizorvr/vizor,vizorvr/vizor-create,beni55/engi,vizorvr/vizor-create,vizorvr/patches,engijs/engi,beni55/engi,engijs/engi,beni55/engi,vizorvr/patches,engijs/engi,vizorvr/patches,vizorvr/patches,vizorvr/vizor,vizorvr/vizor-create,vizorvr/vizor,vizorvr/patches