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https://github.com/DeMuenu/MoonlightVRC.git
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0e633983cf
Replaces the use of world-to-local matrices for shadowcaster planes with explicit plane origin, basis, and normal vectors in both C# and shader code. Updates property setting in ShadowcasterUpdater and its editor preview, and rewrites the shadow sampling function in the shader include to use the new basis. Adjusts all affected shaders to use the new properties and sampling function for improved clarity and flexibility.
33 lines
900 B
HLSL
33 lines
900 B
HLSL
#ifndef SHADOWCASTER_PLANE
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#define SHADOWCASTER_PLANE
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#include "UnityCG.cginc" // for tex2Dlod, etc.
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static const float WS_EPS = 1e-5;
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inline float4 SampleShadowcasterPlaneWS_Basis(
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float3 A, float3 B,
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float3 P0, float3 Uinv, float3 Vinv, float3 N,
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sampler2D tex, float4 OutsideColor, float4 ShadowColor)
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{
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float3 d = B - A;
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float dn = dot(N, d);
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if (abs(dn) < WS_EPS) return OutsideColor;
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float t = dot(N, P0 - A) / dn;
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if (t < 0.0 || t > 1.0) return OutsideColor;
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float3 hit = A + d * t;
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float3 r = hit - P0;
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// u,v in [-0.5, 0.5] if inside quad
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float u = dot(r, Uinv);
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float v = dot(r, Vinv);
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if (abs(u) > 0.5 || abs(v) > 0.5) return OutsideColor;
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float4 returnColor = tex2D(tex, float2(u + 0.5, v + 0.5)) * ShadowColor;
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returnColor = float4(returnColor.rgb * (1 - returnColor.a), 1);
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return returnColor;
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}
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#endif
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