All solved, thanks alot!
Pictures show how i switch different items

Also, can you give a hint on how to pre-process the mesh to save the memory?
it says "coordinates array is sparsely populated"
.
Pictures show how i switch different items

Also, can you give a hint on how to pre-process the mesh to save the memory?
it says "coordinates array is sparsely populated"
.

please help me to solve the problem...