I know how to determine if a face is a hidden one or not but how do i remove it from the vertex array?? heres how my verts are defined - D3DVERTEX* verts; DWORD* Indices; how do i pull out the nth face? do i have to use vertex buffers for performance? usually my vertices range from 400 to 600 verts per object and i usually render 30 such objets per frame (3d RTS). usually half the vertices arent visible so i could be saving a lot of time on transformations and lighting. what is the use of ProcessVertices? how do i use this to precalculate the transformations for all the static objects??