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cultmath hlsl: type-neutral comment on snoise_hessian's matrix layout (lowers to GLSL unchanged in meaning)

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Meta Vens 2026-10-14 06:54:48 +02:00
commit e3ea6d08d4
2 changed files with 6 additions and 4 deletions
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5
packages/cultmath/shaders/CultMath.hlsl
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@ -229,8 +229,9 @@ float4 cultmath_snoise_grad(float3 value)
}
// Analytic Hessian of cultmath_snoise(float3); see the C# math.snoise_hessian comment for the
// derivation. Every local up through p0..p3 and x0..x3 is cultmath_snoise_grad's own. A float3x3 built
// from nine scalars reads as rows here and as columns in GLSL's mat3: the matrix is symmetric.
// derivation. Every local up through p0..p3 and x0..x3 is cultmath_snoise_grad's own. The matrix is
// built from nine scalars, which read as rows in HLSL and as columns in GLSL; it is symmetric, so the
// two agree.
float3x3 cultmath_snoise_hessian(float3 value)
{
float2 c = float2(1.0 / 6.0, 1.0 / 3.0);

5
packages/cultmath/unity/org.gamecult.cultmath/Shaders/CultMath.hlsl
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@ -229,8 +229,9 @@ float4 cultmath_snoise_grad(float3 value)
}
// Analytic Hessian of cultmath_snoise(float3); see the C# math.snoise_hessian comment for the
// derivation. Every local up through p0..p3 and x0..x3 is cultmath_snoise_grad's own. A float3x3 built
// from nine scalars reads as rows here and as columns in GLSL's mat3: the matrix is symmetric.
// derivation. Every local up through p0..p3 and x0..x3 is cultmath_snoise_grad's own. The matrix is
// built from nine scalars, which read as rows in HLSL and as columns in GLSL; it is symmetric, so the
// two agree.
float3x3 cultmath_snoise_hessian(float3 value)
{
float2 c = float2(1.0 / 6.0, 1.0 / 3.0);