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Fix perlin and simplex noises to return normalized value to range 0-1

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#3154
This commit is contained in:
Wojtek Figat
2025-02-12 22:13:09 +01:00
parent 6efb015169
commit c146e156ec
3 changed files with 7 additions and 11 deletions
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5
Source/Shaders/Noise.hlsl
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@@ -89,7 +89,6 @@ float3 rand3dTo3d(float3 value)
);
}
float PerlinNoiseImpl(float4 Pi, float4 Pf)
{
Pi = Mod289(Pi);
@@ -124,7 +123,7 @@ float PerlinNoiseImpl(float4 Pi, float4 Pf)
float2 fade_xy = PerlinNoiseFade(Pf.xy);
float2 n_x = lerp(float2(n00, n01), float2(n10, n11), fade_xy.x);
float n_xy = lerp(n_x.x, n_x.y, fade_xy.y);
return saturate(2.3 * n_xy);
return saturate(n_xy * 2.136f + 0.5f); // Rescale to [0;1]
}
// Classic Perlin noise
@@ -183,7 +182,7 @@ float SimplexNoise(float2 p)
float gx = a0.x * x0.x + h.x * x0.y;
float2 gyz = a0.yz * x12.xz + h.yz * x12.yw;
float3 g = float3(gx, gyz);
return saturate(130.0f * dot(m, g));
return saturate(dot(m, g) * 71.428f + 0.5f); // Rescale to [0;1]
}
// Worley noise (cellar noise with standard 3x3 search window for F1 and F2 values)