Please, bear with me as i''m fluent in OpenGL but a newbie to D3D. In OpenGL, it would be possible to reuse the same texture coordinate array for 2 different TMUs. Like, say you have an array of UV coordinates defined by float *uv; then you could set up a texture matrix on TMU1 and use uv, and set up a different texture matrix on TMU2, and use the same pointer to uv. That way, you do not provide data twice. I simply would like to know if it''s possible to do that in D3D and if so, how (hints to a doc would be fine). I can still duplicate the uv once per TMU, but it doesn''t seem very efficient to me. Another thing, more or less related, is about the way vertices are stored in a vertex buffer. In OpenGL, you are not forced to using an interleaved format (that is: xyz0,uv0,xyz1,uv1,xyz2,uv2 etc.. ); you can also use a linear array of components (xyz0,xyz1,xyz2,uv0,uv1,uv2). I would also like to know if it could be done in D3D or not. In a real situation, say i have 2 pass, for example a first one to draw a diffuse texture, and a second one to blend some lightmap over it (i''m assuming i do not have access to multitexturing, but that''s just for the example). Since the vertices positions (xyz) are the same in the 2 pass, i would like to avoid duplicating them in the 2 vertex buffers... that could easily be done in OpenGL by setting up a pointer to the same array. Any help is appreciated. Y.