Nice!
![Smile :)](./images/smilies/icon_smile.gif)
If you are using the GPUGems effect, almost everything is a matter of density and exposure. Lowering the exposure makes the god rays less intense, and leaves more room for the image, and lowering the density allows them to show more detail by saturating less the effect. Good job!
"There is nothing truly useless, it always serves as a bad example". Arthur A. Schmitt