Aaah, "1.5" explains a lot. That´s the old, hacky, bloated version which I completely rewrote from scratch, the result being this one which is fully my own work. But good point on LDR/HDR modes, should be easy to add into the shader! HDR cubemaps are only a small effort however if you use ATi CubeMapGen on pre made HDRI´s.…