Every DX8 document I''ve read says that I should always use vertex buffers - because they''re efficient & fast. What about in the following situation? I have an engine and I have to draw some lines every frame. Since I''m using d3d lighting I had to create another custom vertex format for the lines (lit & non-transformed). And because I have a different vertex format, I had to create another vertex buffer for the lines. The another VB has 6 vertices in it. And when I''m rendering the lines, I have to change the vertex buffer (setstreamsource) and also the vertexshader. Then I render the lines and swich back the VB and vertexshader. Isn''t this a bit silly for 3 lines (with 6 vertices)? Wouldn''t it be faster to to render the lines with drawprimitiveup and having no vertexbuffer for the lines? I think it takes more time to change the vertex buffer than to render the lines. So, if I shold use drawprimitiveup instead, what kind of memory structure it needs (is it the same kind of like vertex buffers have)? Commando Commando''s Base