Hi, I am working on a terrain engine. I use ROAM and I have a 2048x2048 texture, that I divide into 256x256 textures. But that''s not enough detail. So I want to use detail textures. But I don''t know how to do. I use DirectX 7. I use D3DLVERTEX(D3DVECTOR(x,y,z),color,0,u,v); for my terrain vertices. So actually I need for every polygon the u,v coordinates one time for the detail texture, and one time for the whole texture. But how can I do this?

Flexible Vertex Format (FVF)
I''ve never really worked with DirectX7 but I''m pretty sure FVF already existed there.