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Code Issues 156 Wiki Activity

Give the volumetric clouds lumps, sky and ground light and a fog colour by the angle from the sun

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Hirek
2026-10-16 22:25:11 +02:00
parent 2be85410ce
commit 8b929fc1da
5 changed files with 68 additions and 21 deletions
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12
shaders/clouds_noise.comp
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@@ -82,6 +82,10 @@ float worley_fbm(vec3 position, int frequency, uint seed)
+ worley(position * float(frequency * 4), frequency * 4, seed + 2U) * 0.125;
}
// the worley fbm keeps about to this range (5th and 95th percentile 0.35 and 0.61)
const float WORLEY_FBM_LOW = 0.30;
const float WORLEY_FBM_HIGH = 0.65;
float remap(float value, float low, float high, float newlow, float newhigh)
{
return newlow + (value - low) / (high - low) * (newhigh - newlow);
@@ -111,9 +115,13 @@ void main()
vec3 position = (vec3(texel) + 0.5) / float(size);
if (kind == 0)
{
float low = perlin_fbm(position, 4, 4, 3U) * 0.5 + 0.5;
// both spread over 0-1 first: as sums of octaves they keep to a narrow band about the middle, and a cloud made of them
// would be an even block with no lumps. the cells then cut the perlin noise into rounded heaps: whole in their middles,
// only the highest perlin left between them
float low = even(perlin_fbm(position, 4, 4, 3U), 0.22);
float cells = worley_fbm(position, 4, 5U);
float perlinworley = clamp(remap(low, cells - 1.0, 1.0, 0.0, 1.0), 0.0, 1.0);
float spreadcells = clamp((cells - WORLEY_FBM_LOW) / (WORLEY_FBM_HIGH - WORLEY_FBM_LOW), 0.0, 1.0);
float perlinworley = clamp(remap(low, (1.0 - spreadcells) * 0.6, 1.0, 0.0, 1.0), 0.0, 1.0);
imageStore(noise_volume, texel, vec4(perlinworley, cells, worley_fbm(position, 8, 7U), worley_fbm(position, 16, 9U)));
}
else