1 files changed, 25 insertions, 0 deletions

diff --git a/thirdparty/thekla_atlas/nvmesh/TriMesh.cpp b/thirdparty/thekla_atlas/nvmesh/TriMesh.cpp
new file mode 100644
index 0000000000..bf10a474fb
--- /dev/null
+++ b/thirdparty/thekla_atlas/nvmesh/TriMesh.cpp
@@ -0,0 +1,25 @@
+// This code is in the public domain -- Ignacio Castaņo <castano@gmail.com>
+
+#include "TriMesh.h"
+
+using namespace nv;
+
+
+/// Triangle mesh.
+Vector3 TriMesh::faceNormal(uint f) const
+{
+    const Face & face = this->faceAt(f);
+    const Vector3 & p0 = this->vertexAt(face.v[0]).pos;
+    const Vector3 & p1 = this->vertexAt(face.v[1]).pos;
+    const Vector3 & p2 = this->vertexAt(face.v[2]).pos;
+    return normalizeSafe(cross(p1 - p0, p2 - p0), Vector3(0.0f), 0.0f);
+}
+
+/// Get face vertex.
+const TriMesh::Vertex & TriMesh::faceVertex(uint f, uint v) const
+{
+    nvDebugCheck(v < 3);
+    const Face & face = this->faceAt(f);
+    return this->vertexAt(face.v[v]);
+}
+