rt backface culling

2025-01-29 21:55:11 +01:00
parent 09660ab642
commit 44b147084b
7 changed files with 65 additions and 25 deletions
@@ -0,0 +1,34 @@
+import RayTracingData;
+import Scene;
+import VertexData;
+import MaterialParameter;
+import StaticMeshVertexData;
+
+[shader("anyhit")]
+void anyhit(inout RayPayload hitvalue, in BuiltInTriangleIntersectionAttributes attr)
+{
+    const float3 barycentricCoords = float3(1.0f - attr.barycentrics.x - attr.barycentrics.y, attr.barycentrics.x, attr.barycentrics.y);
+
+    InstanceData inst = pScene.instances[InstanceID()];
+    MeshData m = pScene.meshData[InstanceID()];
+
+    // offset into the index buffer
+    uint indexOffset = m.firstIndex;
+    // added to indices to reference correct part of global mesh pool
+    uint vertexOffset = pScene.meshletInfos[m.meshletOffset].indicesOffset;
+
+    uint vertexIndex0 = vertexOffset + pRayTracingParams.indexBuffer[indexOffset + 3 * PrimitiveIndex() + 0];
+    uint vertexIndex1 = vertexOffset + pRayTracingParams.indexBuffer[indexOffset + 3 * PrimitiveIndex() + 1];
+    uint vertexIndex2 = vertexOffset + pRayTracingParams.indexBuffer[indexOffset + 3 * PrimitiveIndex() + 2];
+
+    VertexAttributes attr0 = pVertexData.getAttributes(vertexIndex0);
+    VertexAttributes attr1 = pVertexData.getAttributes(vertexIndex1);
+    VertexAttributes attr2 = pVertexData.getAttributes(vertexIndex2);
+
+    FragmentParameter f0 = attr0.getParameter(inst.transformMatrix, inst.inverseTransformMatrix);
+    FragmentParameter f1 = attr1.getParameter(inst.transformMatrix, inst.inverseTransformMatrix);
+    FragmentParameter f2 = attr2.getParameter(inst.transformMatrix, inst.inverseTransformMatrix);
+
+    FragmentParameter params = FragmentParameter.interpolate(f0, f1, f2, barycentricCoords);
+
+}