This algorithm utilized a 3D Perlin noise function provided from the OpenGL Orange Book. This noise function created a 3D noise texture which can be passed into the GLSL shader. The shader than uses the current execution time of the OpenGL program as an offset for the texture lookup. As a result this creates a very smooth animation as clouds appear to drift, shrink, grow, or even disappear. While this algorithm was very simple it's result created a very visually appealing cloud animation.
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| Animated noise based cloud shader. |
