sync

Assets/Scripts/Features/OIT/SortTriangles/SortTrianglesOIT.cs

@@ -13,6 +13,7 @@ public class SortTrianglesOIT : MonoBehaviour
     {
         public int[] Indices;
     }
+    [Range(0,4), InspectorName("͸Ã÷ÎïÌå SubMesh Id")]
     public int SubMeshIndex = 0;
     // XXX: 根据重叠三角形,计算实际需要的数据,减少序列化大小
     [SerializeField]
@@ -30,6 +31,7 @@ public class SortTrianglesOIT : MonoBehaviour
     private uint meshIndicesCnt;
     [SerializeField, HideInInspector]
     private List<SubMeshDescriptor> subMeshDescriptors = new();
+    private const float maxCameraDistance = 200;
 
     private static readonly Vector3[] viewDirections =
         {
@@ -78,7 +80,13 @@ public class SortTrianglesOIT : MonoBehaviour
         }
 #endif
 
-        var viewDir = (pos - transform.position).normalized;
+        Vector3 viewVec = pos - transform.position;
+        if (viewVec.sqrMagnitude > maxCameraDistance)
+        {
+            return;
+        }
+
+        var viewDir = viewVec.normalized;
         for (int i = 0; i < viewDirections.Length; i++)
         {
             if (Vector3.Dot(viewDir, viewDirections[i]) > directionalMinCos)
@@ -156,12 +164,18 @@ public class SortTrianglesOIT : MonoBehaviour
     struct PrimitiveDepth : IComparable<PrimitiveDepth>
     {
         public float depth;
+        public float isfront;
         public uint a;
         public uint b;
         public uint c;
 
         public int CompareTo(PrimitiveDepth other)
         {
+            //if (isfront < 0.5f )
+            //{
+            //    return 0;
+            //}
+
             var i = depth - other.depth;
             if(!SystemInfo.usesReversedZBuffer)
             {
@@ -262,5 +276,19 @@ public class SortTrianglesOIT : MonoBehaviour
         GameObject.DestroyImmediate(renderCamera.gameObject);
         isSorted = true;
     }
+
+
+    public void Bake()
+    {
+        SortTriangles();
+    }
+
+    public void ClearBake()
+    {
+        isSorted = false;
+        var path = UnityEditor.AssetDatabase.GetAssetPath(GetComponent<MeshFilter>().sharedMesh);
+        UnityEditor.AssetImporter assetImporter = UnityEditor.AssetImporter.GetAtPath(path);
+        assetImporter.SaveAndReimport();
+    }
 #endif
 }

Assets/Scripts/Features/OIT/SortTriangles/TrianglesIdDepth.shader

@@ -17,12 +17,14 @@ Shader "OIT/TrianglesIdDepth"
             struct appdata
             {
                 float4 vertex : POSITION;
+                float3 normal : NORMAL;
             };
 
             struct VSOut
             {
                 float4 position : POSITION;
-                uint index : TEXCOORD;
+                nointerpolation uint index : TEXCOORD0;
+                nointerpolation float vface : TEXCOORD1;
             };
 
             struct GSOut
@@ -33,6 +35,10 @@ Shader "OIT/TrianglesIdDepth"
             VSOut vert(appdata v, uint index : SV_VertexID)
             {
                 VSOut o;
+                float3 worldPos = mul(unity_ObjectToWorld, v.vertex).xyz;
+                float3 viewDir = normalize(_WorldSpaceCameraPos - worldPos);
+                float3 worldNormal = UnityObjectToWorldNormal(v.normal);
+                o.vface = (dot(worldNormal, viewDir) > 0 )? 1.0 : -1.0; 
                 o.position = UnityObjectToClipPos(v.vertex);
                 o.index = index;
                 return o;
@@ -41,6 +47,7 @@ Shader "OIT/TrianglesIdDepth"
             struct PrimitiveDepth
             {
                 float depth;
+                float isfront;
                 uint a;
                 uint b;
                 uint c;
@@ -52,30 +59,16 @@ Shader "OIT/TrianglesIdDepth"
             void geom(triangle VSOut IN[3], uint primID : SV_PrimitiveID, inout TriangleStream<GSOut> triStream)
             {
                 PrimitiveDepth o;
-                o.depth = (IN[0].position.z + IN[1].position.z + IN[2].position.z) / 3;
+                float3 A = IN[0].position.xyz;
+                float3 B = IN[1].position.xyz;
+                float3 C = IN[2].position.xyz;
+                o.depth = (A.z + B.z + C.z) / 3;
                 o.a = IN[0].index;
                 o.b = IN[1].index;
                 o.c = IN[2].index;
-                // if (o.a > o.b)
+                
-                // {
+                o.isfront = IN[0].vface;
-                //     uint tmp = o.b;
+
-                //     o.b = o.a;
-                //     o.a = tmp;
-                // }
-                //
-                // if (o.a > o.c)
-                // {
-                //     uint tmp = o.c;
-                //     o.c = o.a;
-                //     o.a = tmp;
-                // }
-                //
-                // if (o.b > o.c)
-                // {
-                //     uint tmp = o.b;
-                //     o.b = o.c;
-                //     o.c = tmp;
-                // }
                 primitiveBuffer[primID] = o;
                 
                 for (int i = 0; i < 3; ++i)