33 lines
1.5 KiB
HLSL
33 lines
1.5 KiB
HLSL
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#ifndef CLOUD_NOISE_INCLUDED
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#define CLOUD_NOISE_INCLUDED
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#include "SimplexNoise3D.hlsl"
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void CloudNoise_half(float2 UV, float Scale, float VerticalSpeed, float2 Step, float Coverage, float Time, out float Sample)
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{
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// FBX Calculations (Lacunarity, Octaves, Amplitude)
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float n = snoise(float3(UV * Scale, Time * VerticalSpeed));
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n += 0.5 * snoise(float3((UV * 2.0 - Step) * Scale, Time * VerticalSpeed));
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n += 0.25 * snoise(float3((UV * 4.0 - 2.0 * Step) * Scale, Time * VerticalSpeed));
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n += 0.125 * snoise(float3((UV * 8.0 - 3.0 * Step) * Scale, Time * VerticalSpeed));
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n += 0.0625 * snoise(float3((UV * 16.0 - 4.0 * Step) * Scale, Time * VerticalSpeed));
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n += 0.03125 * snoise(float3((UV * 32.0 - 5.0 * Step) * Scale, Time * VerticalSpeed));
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Sample = Coverage + 0.5 * n;
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return;
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}
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void CloudNoise_float(float2 UV, float Scale, float VerticalSpeed, float2 Step, float Coverage, float Time, out float Sample)
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{
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// FBX Calculations (Lacunarity, Octaves, Amplitude)
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float n = snoise(float3(UV * Scale, Time * VerticalSpeed));
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n += 0.5 * snoise(float3((UV * 2.0 - Step) * Scale, Time * VerticalSpeed));
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n += 0.25 * snoise(float3((UV * 4.0 - 2.0 * Step) * Scale, Time * VerticalSpeed));
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n += 0.125 * snoise(float3((UV * 8.0 - 3.0 * Step) * Scale, Time * VerticalSpeed));
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n += 0.0625 * snoise(float3((UV * 16.0 - 4.0 * Step) * Scale, Time * VerticalSpeed));
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n += 0.03125 * snoise(float3((UV * 32.0 - 5.0 * Step) * Scale, Time * VerticalSpeed));
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Sample = Coverage + 0.5 * n;
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return;
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}
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#endif
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