The way I handled this is to just use 6 vertices and pass in all 6 to the index buffer. You could just use 4 if you have culling turned off and use triangle_strips...because I think half of the quad will get culled if you have culling on for triangle_strips. I don''t know for sure. I think it''s less memory intensive to copy an index buffer with 6 DWORDs per quad than copy 6 vertex structures per quad to recreate a vertex buffer. I couldn''t swear to that, but it seems like it would be.

You can''t save vertices when you tile like this, because like you said each vertex will have a different texture coordinate.

The only savings that you gain from index buffers will come with something like a mesh with a single texture applied to it (a terrain). There could be a lot of shared vertices, but the tex coord is the same for all of the shared vertices in a given spot, so it works okay.

Hope that helps,
Chris

Find a texture that wraps properly and you won''t have to worry about it.

Ummm...?

If you have vertices like this:

. . . . .. . . . .. . . . .. . . . .. . . . . 

You can give them texture coordinates like this:

0,0 1,0 2,0 3,0 4,0 5,00,1 1,1 2,1 3,1 4,1 5,10,2 1,2 2,2 3,2 4,2 5,20,3 1,3 2,3 3,3 4,3 5,30,4 1,4 2,4 3,4 4,4 5,40,5 1,5 2,5 3,5 4,5 5,5 

Assuming you haven''t changed any of the wrapping settings, that should take care of everything for you without you having to duplicate vertices.

Artists know how to create textures that tile correctly (left edge matches up with right edge; top with bottom). Thus, you don''t need to duplicate vertices; just keep going on the tiling.

Beware that some graphics cards start having poor precision after about 32x tiling, so don''t go overboard; you gotta restart from 0 (or -32) at some point.