+Unity Runtime codeHEADmaster

1 files changed, 42 insertions, 0 deletions

diff --git a/Runtime/Filters/Mesh/MeshUtility.h b/Runtime/Filters/Mesh/MeshUtility.h
new file mode 100644
index 0000000..748c874
--- /dev/null
+++ b/Runtime/Filters/Mesh/MeshUtility.h
@@ -0,0 +1,42 @@
+#ifndef MESHUTILITY_H
+#define MESHUTILITY_H
+
+#include "Runtime/Math/Vector3.h"
+#include "Runtime/Math/Matrix4x4.h"
+#include "Runtime/Math/Quaternion.h"
+#include "Runtime/Filters/Mesh/LodMesh.h"
+#include "Runtime/Utilities/StrideIterator.h"
+#include "Runtime/Utilities/dynamic_array.h"
+
+struct Tangent;
+
+// Calculate normals for the mesh, given vertex array and triangle list (3 indices per triangle).
+void CalculateNormals( StrideIterator<Vector3f> verts, const UInt32* indices, int vertexCount, int triangleCount, StrideIterator<Vector3f> outNormals );
+
+float CalculateSurfaceArea (const Matrix4x4f& objectToWorld, const Mesh::TemporaryIndexContainer& triangles, dynamic_array<Vector3f>& vertices);
+
+// Use this to generate a normal from an tangent basis quickly
+inline Vector3f NormalFromQuatTangentBasis (const Quaternionf& lhs)
+{
+	float x = lhs.x * 2.0F;
+	float y = lhs.y * 2.0F;
+	float z = lhs.z * 2.0F;
+	float xx = lhs.x * x;
+	float yy = lhs.y * y;
+	float xz = lhs.x * z;
+	float yz = lhs.y * z;
+	float wx = lhs.w * x;
+	float wy = lhs.w * y;
+
+	Vector3f res;
+	res.x = xz - wy;
+	res.y = yz + wx;
+	res.z = 1.0f - xx - yy;
+	AssertIf (!CompareApproximately (res, RotateVectorByQuat(Inverse (lhs), Vector3f::zAxis)));
+	return res;
+}
+
+//bool HasDegenerateTriangles (const Vector3f* verts, const MeshData &meshData, float degenerateArea = 0.0001);
+
+
+#endif