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Added stencil setup in UTSAPI;

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Changed hair shadow length from screen space to world space;
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Misaki
2025-05-24 00:05:50 +09:00
parent 5b2eb17148
commit 1a93e81edd
7 changed files with 193 additions and 41 deletions
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18
Runtime/Shaders/Includes/Lighting/UtsShadowEvaluation.hlsl
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@@ -37,17 +37,15 @@ float GetHairShadow(PositionInputs posInput, float3 L)
if (hairShadowOpacity > 0.0)
{
float3 viewLightDir = TransformWorldToViewDir(L);
float shadowLengthY = _HairShadowDistance * 5.0 * max(0.5, posInput.linearDepth * _HairShadowDistanceScaleFactor) / posInput.linearDepth;
float2 shadowLength = float2(shadowLengthY * 2.0f, shadowLengthY);
float3 viewOffsetPos = TransformWorldToView(posInput.positionWS) + viewLightDir * _HairShadowDistance * 0.01;
float4 clipPos = mul(UNITY_MATRIX_P, float4(viewOffsetPos, 1.0));
float2 samplingPointSS = clipPos.xy / clipPos.w;
samplingPointSS = samplingPointSS * 0.5 + 0.5;
#if UNITY_UV_STARTS_AT_TOP
samplingPointSS.y = 1.0 - samplingPointSS.y;
#endif
float3 cameraDirOS = normalize(TransformWorldToObject(GetCameraPositionWS()));
float cameraDirFactor = 1.0 - smoothstep(0.1, 0.9, cameraDirOS.y);
// shadowLength.y *= cameraDirFactor;
// TODO: sample point is still shifting when fov change.
float2 samplingPoint = (posInput.positionSS + shadowLength * viewLightDir.xy) * _ScreenSize.zw; // Use 1080p as the reference resolution to achieve consistent shadow lengths across various screen resolutions.
float2 scaledUVs = samplingPoint * _RTHandleScale.xy; // We have to including the scaling factor for our shadow map since we are not going to allocate new texture if the rendering resolution changed.
float2 scaledUVs = samplingPointSS * _RTHandleScale.xy; // We have to including the scaling factor for our shadow map since we are not going to allocate new texture if the rendering resolution changed.
float hairShadow = SAMPLE_TEXTURE2D_SHADOW(_HairShadowTex, s_linear_clamp_compare_sampler, float3(scaledUVs, posInput.deviceDepth + _HairShadowDepthBias)).r;
shadow = lerp(1.0 - hairShadowOpacity, 1.0, hairShadow);
}