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Refactor shadowcaster to use explicit plane basis

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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.
This commit is contained in:
DeMuenu
2025-10-01 13:26:33 +02:00
parent 841d99ad0e
commit 0e633983cf
5 changed files with 225 additions and 191 deletions
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43
Shader/BlendinShader.shader
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@@ -86,13 +86,22 @@ Shader "DeMuenu/World/Hoppou/RevealStandart"
MoonlightGlobalVariables
float4x4 _Udon_WorldToLocal_1;
float4 _Udon_Plane_Origin_1; // xyz = origin (world), w unused
float4 _Udon_Plane_Uinv_1; // xyz = Udir / (2*halfWidth)
float4 _Udon_Plane_Vinv_1; // xyz = Vdir / (2*halfHeight)
float4 _Udon_Plane_Normal_1; // xyz = unit normal
sampler2D _Udon_shadowCasterTex_1;
float4 _Udon_shadowCasterColor_1;
float4 _Udon_OutSideColor_1;
float _Udon_MinBrightnessShadow_1;
float4x4 _Udon_WorldToLocal_2;
float4 _Udon_Plane_Origin_2;
float4 _Udon_Plane_Uinv_2;
float4 _Udon_Plane_Vinv_2;
float4 _Udon_Plane_Normal_2;
sampler2D _Udon_shadowCasterTex_2;
float4 _Udon_shadowCasterColor_2;
float4 _Udon_OutSideColor_2;
@@ -152,20 +161,26 @@ Shader "DeMuenu/World/Hoppou/RevealStandart"
Lambert(_Udon_LightPositions[LightCounter].xyz ,i, N); //defines NdotL
LightTypeCalculations(_Udon_LightColors, LightCounter, i, NdotL, dIntensity, _Udon_LightPositions[LightCounter].a, _Udon_LightPositions[LightCounter].xyz);
float4 ShadowCasterMult_1 = 1;
float4 ShadowCasterMult_2 = 1;
float4 ShadowCasterMult_1 = float4(1,1,1,1);
float4 ShadowCasterMult_2 = float4(1,1,1,1);
if (((_Udon_ShadowMapIndex[LightCounter] > 0.5) && (_Udon_ShadowMapIndex[LightCounter] < 1.5)) || (_Udon_ShadowMapIndex[LightCounter] > 2.5)) {
ShadowCasterMult_1 = SampleShadowcasterPlane(_Udon_WorldToLocal_1, _Udon_shadowCasterTex_1, _Udon_LightPositions[LightCounter].xyz, i.worldPos, _Udon_OutSideColor_1);
ShadowCasterMult_1 *= _Udon_shadowCasterColor_1;
ShadowCasterMult_1 = float4(ShadowCasterMult_1.rgb * (1-ShadowCasterMult_1.a), 1);
ShadowCasterMult_1 = max(ShadowCasterMult_1, _Udon_MinBrightnessShadow_1)
if (((_Udon_ShadowMapIndex[LightCounter] > 0.5) && (_Udon_ShadowMapIndex[LightCounter] < 1.5)) || (_Udon_ShadowMapIndex[LightCounter] > 2.5))
{
float4 sc1 = SampleShadowcasterPlaneWS_Basis(
_Udon_LightPositions[LightCounter].xyz, i.worldPos,
_Udon_Plane_Origin_1.xyz, _Udon_Plane_Uinv_1.xyz, _Udon_Plane_Vinv_1.xyz, _Udon_Plane_Normal_1.xyz,
_Udon_shadowCasterTex_1, _Udon_OutSideColor_1, _Udon_shadowCasterColor_1);
ShadowCasterMult_1 = max(sc1, _Udon_MinBrightnessShadow_1);
}
if (_Udon_ShadowMapIndex[LightCounter] > 1.5) {
ShadowCasterMult_2 = SampleShadowcasterPlane(_Udon_WorldToLocal_2, _Udon_shadowCasterTex_2, _Udon_LightPositions[LightCounter].xyz, i.worldPos, _Udon_OutSideColor_2);
ShadowCasterMult_2 *= _Udon_shadowCasterColor_2;
ShadowCasterMult_2 = float4(ShadowCasterMult_2.rgb * (1-ShadowCasterMult_2.a), 1);
ShadowCasterMult_2 = max(ShadowCasterMult_2, _Udon_MinBrightnessShadow_2)
if (_Udon_ShadowMapIndex[LightCounter] > 1.5)
{
float4 sc2 = SampleShadowcasterPlaneWS_Basis(
_Udon_LightPositions[LightCounter].xyz, i.worldPos,
_Udon_Plane_Origin_2.xyz, _Udon_Plane_Uinv_2.xyz, _Udon_Plane_Vinv_2.xyz, _Udon_Plane_Normal_2.xyz,
_Udon_shadowCasterTex_2, _Udon_OutSideColor_2, _Udon_shadowCasterColor_2);
ShadowCasterMult_2 = max(sc2, _Udon_MinBrightnessShadow_2);
}
dmax = dmax + contrib * float4(LightColor, 1) * ShadowCasterMult_1 * ShadowCasterMult_2;