July 2015
Intermediate to advanced
586 pages
17h 21m
English
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222 III Lighting
3.3 Volumetric Fog Algorithm
Volumetric fog is an extension of existing ray-marching algorithms like in [T´oth
and Umenhoffer 09]. However, by decoupling and splitting typical ray-marching
steps and using intermediate storage, we aimed to solve the aforementioned dis-
advantages of classic 2D ray-marching solutions.
We based our algorithm on existing research on atmospheric scattering used in
the CGI industry and movies [Wrennige et al. 10] and computer games algorithms
using hardware volumetric 3D textures as an intermediate storage [Kaplanyan 09].
An article by Wrennige et al. describes how 3D textures and grids are used in
the VFX
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