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diff --git a/thirdparty/thekla_atlas/nvmath/Plane.h b/thirdparty/thekla_atlas/nvmath/Plane.h
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+++ b/thirdparty/thekla_atlas/nvmath/Plane.h
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+// This code is in the public domain -- Ignacio Castaņo <castano@gmail.com>
+
+#pragma once
+#ifndef NV_MATH_PLANE_H
+#define NV_MATH_PLANE_H
+
+#include "nvmath.h"
+#include "Vector.h"
+
+namespace nv
+{
+    class Matrix;
+
+    class NVMATH_CLASS Plane
+    {
+    public:
+        Plane();
+        Plane(float x, float y, float z, float w);
+        Plane(const Vector4 & v);
+        Plane(const Vector3 & v, float d);
+        Plane(const Vector3 & normal, const Vector3 & point);
+        Plane(const Vector3 & v0, const Vector3 & v1, const Vector3 & v2);
+
+        const Plane & operator=(const Plane & v);
+
+        Vector3 vector() const;
+        float offset() const;
+        Vector3 normal() const;
+
+        void operator*=(float s);
+
+        Vector4 v;
+    };
+
+    Plane transformPlane(const Matrix &, const Plane &);
+
+    Vector3 planeIntersection(const Plane & a, const Plane & b, const Plane & c);
+
+
+} // nv namespace
+
+#endif // NV_MATH_PLANE_H