even though I called them "blocks" some times they are not wed blocks. They are simple med models. I am trying the shader route here:
http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Number=399546&#Post399546 but am open to any suggestions. What is that u1 u2 thing you mentioned for? Changing the UV texture mapping coordinates at runtime or something else?