In my d3d engine i am using serveal hundred meshes for grass rendering. I dynamically reposition the meshes based on distance to camera. This way i can have apparently continuous fields of grass without using millions of models. But I am wondering if there is a way to optimize this further by batching all these meshes together and draw them all with one draw call. Is there an efficient way to batch D3DX Meshes? It seem I could use D3DXConcatenateMesh, but this seems like it is slow, plus i dont get the expected results. Is the best method? or is there a better way? Or is it just too much of a pain to batch meshes that are going to be moved around dynamically?

Yes this could work, thanks... I'll look into it.

Hmm, does anyone have any pointers on how to use D3DX Meshes with instancing mehtods? It seems D3DX has no interface native for this purpose, and i have to convert meshes to index buffers..