I'm making an optimization method to remove those meshes at are out of the camera's view. I have the bounding box of the mesh, and the transformation. I think the idea would be to compare, using a function, if any point of the bounding box is inside the view of the camera, based on it's projection, aperture, and range. Is there any helper function to detect this in DirectX 9, or do I have to build my own? Thanks in advance.