Outerra Engine > Development screen shots and videos
Clouds - a peek at the work in progress
cameni:
There's a simplified ray marching done in the projected 2D cloud height space, where we are computing the light scattering and absorption from sun.
cudd:
Ah that makes sense. Having tried it myself I got some decent results from just marching through the full depth of the clouds assuming no incident extinction. This doesn't give the nice shadowing effects however.
From what I can gather your projected 2D cloud height space consists of the closest fragments in the geometry to the viewer and you march from there?
I'm impressed, even when running my basic toy I'm seeing some great frame rates.
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