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39 lines
1.5 KiB
HLSL
39 lines
1.5 KiB
HLSL
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// For more information, visit -> https://github.com/ColinLeung-NiloCat/UnityURPToonLitShaderExample
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#ifndef Include_NiloZOffset
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#define Include_NiloZOffset
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// Push an imaginary vertex towards camera in view space (linear, view space unit),
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// then only overwrite original positionCS.z using imaginary vertex's result positionCS.z value
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// Will only affect ZTest ZWrite's depth value of vertex shader
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// Useful for:
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// -Hide ugly outline on face/eye
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// -Make eyebrow render on top of hair
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// -Solve ZFighting issue without moving geometry
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float4 NiloGetNewClipPosWithZOffset(float4 originalPositionCS, float viewSpaceZOffsetAmount)
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{
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if(unity_OrthoParams.w == 0)
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{
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////////////////////////////////
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//Perspective camera case
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////////////////////////////////
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float2 ProjM_ZRow_ZW = UNITY_MATRIX_P[2].zw;
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float modifiedPositionVS_Z = -originalPositionCS.w + -viewSpaceZOffsetAmount; // push imaginary vertex
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float modifiedPositionCS_Z = modifiedPositionVS_Z * ProjM_ZRow_ZW[0] + ProjM_ZRow_ZW[1];
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originalPositionCS.z = modifiedPositionCS_Z * originalPositionCS.w / (-modifiedPositionVS_Z); // overwrite positionCS.z
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return originalPositionCS;
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}
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else
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{
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////////////////////////////////
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//Orthographic camera case
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////////////////////////////////
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originalPositionCS.z += -viewSpaceZOffsetAmount / _ProjectionParams.z; // push imaginary vertex and overwrite positionCS.z
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return originalPositionCS;
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}
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}
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#endif
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