Misaki
ef2bdeac98
Added geometry data; Changed name of VolumeObject to AoVolume; Removed the capsule type in VolumeType, all volumes are box volume now;
49 lines
1.4 KiB
HLSL
49 lines
1.4 KiB
HLSL
#ifndef VOLUME_SDF
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#define VOLUME_SDF
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#include "Packages/com.misaki.ao-volume/Runtime/Shader/Includes/VolumeData.cs.hlsl"
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float3 GetPositionLS(float4x4 inverseWorldMatrix, float3 positionWS)
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{
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return mul(inverseWorldMatrix, float4(positionWS, 1.0)).xyz;
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}
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float BoxSDF(float3 positionWS, VolumeData data)
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{
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float3 halfDim = data.size * 0.5;
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float3 positionLS = GetPositionLS(data.inverseWorldMatrix, positionWS);
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float3 d = halfDim - abs(positionLS);
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float distToFace = min(d.x, min(d.y, d.z));
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float maxDist = min(halfDim.x, min(halfDim.y, halfDim.z));
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return saturate(distToFace / maxDist);
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}
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float CapsuleSDF(float3 positionWS, VolumeData data)
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{
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float3 positionLS = GetPositionLS(data.inverseWorldMatrix, positionWS);
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float radius = data.size.x;
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float length = data.size.y;
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// Define capsule along Y-axis in local space
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float3 capsuleStart = float3(0, -length * 0.5, 0);
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float3 capsuleEnd = float3(0, length * 0.5, 0);
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// Compute SDF in local space
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float3 dir = capsuleEnd - capsuleStart;
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float lengthSq = dot(dir, dir);
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float3 toPoint = positionLS - capsuleStart;
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float projection = saturate(dot(toPoint, dir) / lengthSq);
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float3 closestPoint = capsuleStart + projection * dir;
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return distance(positionLS, closestPoint) - radius;
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}
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float EvaluateAOVolumeMask(VolumeData data, float3 positionWS, float3 normalWS)
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{
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return BoxSDF(positionWS, data);
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}
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#endif |