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69 行
1.9 KiB
69 行
1.9 KiB
#ifndef __TEETHATTENUATION_HLSL__
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#define __TEETHATTENUATION_HLSL__
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#if !defined(TEETH_DATA_FIXED_6) && !defined(TEETH_DATA_VARIABLE_32)
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#define TEETH_DATA_FIXED_6
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#endif
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#if !defined(TEETH_ATTN_NONE) && !defined(TEETH_ATTN_LINEAR) && !defined(TEETH_ATTN_SKYPOLYGON)
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#define TEETH_ATTN_NONE
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#endif
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#if defined(TEETH_DATA_FIXED_6)
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#define SPHERICALPOLYGON_MAX_VERTS 6
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#define SPHERICALPOLYGON_NUM_VERTS 6
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#elif defined(TEETH_DATA_VARIABLE_32)
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#define SPHERICALPOLYGON_MAX_VERTS 32
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#define SPHERICALPOLYGON_NUM_VERTS _TeethVertexCount
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#else
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#define SPHERICALPOLYGON_MAX_VERTS 3
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#define SPHERICALPOLYGON_NUM_VERTS 3
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#endif
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uniform float4 _TeethParams;// x = lit potential min, y = lit potential max
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uniform float4 _TeethVertexData[SPHERICALPOLYGON_MAX_VERTS];
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uniform int _TeethVertexCount;
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#include "Packages/com.unity.demoteam.digital-human/ShaderLibrary/Nodes_Teeth/SphericalPolygon.hlsl"
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void TeethAttenuation_float(in float3 positionWS, out float attnPure, out float attnBiased)
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{
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attnPure = 1.0;
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attnBiased = 1.0;
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{
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#if defined(TEETH_ATTN_NONE)
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return;// no modification
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#elif defined(TEETH_ATTN_LINEAR)
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float3 posFront = _TeethVertexData[0].xyz;
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float3 posBack = _TeethVertexData[1].xyz;
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float3 v = posFront - posBack;
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float dd = dot(v, v);
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attnPure = saturate(dot(v / dd, positionWS - posBack));
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attnBiased = _TeethParams.x + attnPure * (_TeethParams.y - _TeethParams.x);
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#elif defined(TEETH_ATTN_SKYPOLYGON)
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float3 P[SPHERICALPOLYGON_MAX_VERTS];
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for (int i = 0; i != SPHERICALPOLYGON_NUM_VERTS; i++)
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{
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P[i] = normalize(_TeethVertexData[i].xyz - positionWS);
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}
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float incidentMax = 2.0 * PI;// hemisphere
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float incidentSky;
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SphericalPolygon_CalcAreaFromProjectedPositions(P, incidentSky);
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attnPure = saturate(incidentSky / incidentMax);
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attnPure = saturate(1.0 - pow(1.0 - attnPure, _TeethParams.z));
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attnBiased = _TeethParams.x + attnPure * (_TeethParams.y - _TeethParams.x);
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#endif
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}
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}
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#endif//__TEETHATTENUATION_HLSL__
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