Camera-space +Y axis in world coords (downward in image).
Eye position (copy of camera.position).
Horizontal focal length in pixels.
Vertical focal length in pixels.
Camera-space +Z axis in world coords (into the scene).
Camera-space +X axis in world coords (rightward in image).
Derived camera basis and intrinsics in the conventions described on RenderCamera. The 3x3 view rotation rows are (right, down, forward); the translation is -R * eye. Focal lengths are in pixel units.