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Light shafts

This effect is taken from nVidia GPU Gems 3 book : a post processing effect to generate light shafts due to the sun light scattering in the air which contain, for example, gas molecules.

The implementation is the same eccepted that I add an extra blur pass to avoid visible arctifacts due to a limited number of samples. I also generate a fake sky : you can control sun altitude by using '+' and '-' key.

Download source and executable

The 'ray of god' effect


Without the extra blur pass
With the extra blur pass, the resulting image is softer


As a post process, the effect is not looking good when you look outward the sun

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