hey all, Is it good to have an Octree class on which each frame i perform fustum culling, and then when it comes to drawing the triangles in the octree using a Bsp Tree (compiled when the octree is) which i use for backface culling and a few other things, ie so each octree has its own bsp tree ? Or just stick to an Octree class ?

BSP''s and Octree are diverse things well technical and is thus more insurance then not to combine. Of course, there are histories of the success that float around, but for most, you must stick one over itself. BSP is regarded type also.