Screenshot details:
25 July 2009

Cloud rendering using a modified version of the Relief Mapping algorithm for simulating the light scattering inside the cloud.
The clouds are just a geometry plane placed on the sky with the algorithm shader applied to it that gives the volumetric look to the clouds.

The algorithm works by tracing the light path across the clouds until it reaches the viewer. This is done using a modified Relief Mapping technique that, like the original algorithm, uses an heightmap to represent the clouds shape, but instead of searching the intersection of the view ray with the heightmap, it calculates how much cloud volume has the light ray crossed and applies an attenuation factor based on that.

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