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Runtime/Shader/Includes/VolumeData.cs

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+using System;
+using UnityEngine;
+using UnityEngine.Rendering;
+
+namespace Misaki.AoVolume
+{
+    [GenerateHLSL]
+    internal enum VolumeType
+    {
+        Capsule,
+        Box
+    }
+
+    [Serializable]
+    [GenerateHLSL(needAccessors = false)]
+    internal struct VolumeData
+    {
+        public VolumeType volumeType;
+
+        public Matrix4x4 worldMatrix;
+        public Matrix4x4 inverseWorldMatrix;
+        public Vector3 size;
+
+        public float intensity;
+        public float falloff;
+        public float normalFalloff;
+    }
+}

Runtime/Shader/Includes/VolumeData.cs.hlsl

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+//
+// This file was automatically generated. Please don't edit by hand. Execute Editor command [ Edit > Rendering > Generate Shader Includes ] instead
+//
+
+#ifndef VOLUMEDATA_CS_HLSL
+#define VOLUMEDATA_CS_HLSL
+//
+// Misaki.AoVolume.VolumeType:  static fields
+//
+#define VOLUMETYPE_CAPSULE (0)
+#define VOLUMETYPE_BOX (1)
+
+// Generated from Misaki.AoVolume.VolumeData
+// PackingRules = Exact
+struct VolumeData
+{
+    int volumeType;
+    float4x4 worldMatrix;
+    float4x4 inverseWorldMatrix;
+    float3 size;
+    float intensity;
+    float falloff;
+    float normalFalloff;
+};
+
+
+#endif

Runtime/Shader/Includes/VolumeData.cs.hlsl.meta

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+ShaderIncludeImporter:
+  externalObjects: {}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Runtime/Shader/Includes/VolumeData.cs.meta

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+guid: c7f876ff60a035f43a75279d1731ac41

Runtime/Shader/Includes/VolumeSDF.hlsl

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+#ifndef VOLUME_SDF
+#define VOLUME_SDF
+
+#include "Packages/com.misaki.ao-volume/Runtime/Shader/Includes/VolumeData.cs.hlsl"
+
+float3 GetPositionLS(float4x4 inverseWorldMatrix, float3 positionWS)
+{
+    return mul(inverseWorldMatrix, float4(positionWS, 1.0)).xyz;
+}
+
+float BoxSDF(float3 positionWS, VolumeData data)
+{
+    float3 halfDim = data.size * 0.5;
+    
+    float3 positionLS = GetPositionLS(data.inverseWorldMatrix, positionWS);
+    
+    float3 d = halfDim - abs(positionLS);
+    float distToFace = min(d.x, min(d.y, d.z));
+    float maxDist = min(halfDim.x, min(halfDim.y, halfDim.z));
+    
+    return saturate(distToFace / maxDist);
+}
+
+float CapsuleSDF(float3 positionWS, VolumeData data)
+{
+    float3 positionLS = GetPositionLS(data.inverseWorldMatrix, positionWS);
+
+    float radius = data.size.x;
+    float length = data.size.y;
+    
+    // Define capsule along Y-axis in local space
+    float3 capsuleStart = float3(0, -length * 0.5, 0);
+    float3 capsuleEnd = float3(0, length * 0.5, 0);
+
+    // Compute SDF in local space
+    float3 dir = capsuleEnd - capsuleStart;
+    float lengthSq = dot(dir, dir);
+    float3 toPoint = positionLS - capsuleStart;
+    float projection = saturate(dot(toPoint, dir) / lengthSq);
+    float3 closestPoint = capsuleStart + projection * dir;
+    return distance(positionLS, closestPoint) - radius;
+}
+
+float EvaluateAOVolumeMask(VolumeData data, float3 positionWS, float3 normalWS)
+{
+    float volumeSDF = 1.0;
+    switch (data.volumeType)
+    {
+        case VOLUMETYPE_CAPSULE:
+            volumeSDF = CapsuleSDF(positionWS, data);
+            break;
+        case VOLUMETYPE_BOX:
+            volumeSDF = BoxSDF(positionWS, data);
+            break;
+    }
+    
+    return volumeSDF;
+}
+
+#endif

Runtime/Shader/Includes/VolumeSDF.hlsl.meta

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+guid: 415aa9e4981653147803fb5036c79f4c
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+  userData: 
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