Getting Tilted

Moving forward a bit, we've implemented the background layer very similar to After Burner's. There isn't actually a ground plane or 3D skybox in this image -- instead, we are finding the vanishing point on the ground and then rotating a 2D backdrop to match the camera angle, and drawing sky colors above and ground colors below. It wasn't visible in the previous post, but this also modifies the billboard sprite code to rotate them to match the camera roll as well.