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diff --git a/thirdparty/thekla_atlas/nvmath/Matrix.h b/thirdparty/thekla_atlas/nvmath/Matrix.h
deleted file mode 100644
index 506bdad1ca..0000000000
--- a/thirdparty/thekla_atlas/nvmath/Matrix.h
+++ /dev/null
@@ -1,113 +0,0 @@
-// This code is in the public domain -- castanyo@yahoo.es
-
-#pragma once
-#ifndef NV_MATH_MATRIX_H
-#define NV_MATH_MATRIX_H
-
-#include "Vector.h"
-
-// - Matrices are stored in memory in *column major* order.
-// - Points are to be though of as column vectors.
-// - Transformation of a point p by a matrix M is: p' = M * p
-
-namespace nv
-{
-    enum identity_t { identity };
-
-    // 3x3 matrix.
-    class NVMATH_CLASS Matrix3
-    {
-    public:
-        Matrix3();
-        explicit Matrix3(float f);
-        explicit Matrix3(identity_t);
-        Matrix3(const Matrix3 & m);
-        Matrix3(Vector3::Arg v0, Vector3::Arg v1, Vector3::Arg v2);
-
-        float data(uint idx) const;
-        float & data(uint idx);
-        float get(uint row, uint col) const;
-        float operator()(uint row, uint col) const;
-        float & operator()(uint row, uint col);
-
-        Vector3 row(uint i) const;
-        Vector3 column(uint i) const;
-
-        void operator*=(float s);
-        void operator/=(float s);
-        void operator+=(const Matrix3 & m);
-        void operator-=(const Matrix3 & m);
-
-        void scale(float s);
-        void scale(Vector3::Arg s);
-        float determinant() const;
-
-    private:
-        float m_data[9];
-    };
-
-    // Solve equation system using LU decomposition and back-substitution.
-    extern bool solveLU(const Matrix3 & m, const Vector3 & b, Vector3 * x);
-
-    // Solve equation system using Cramer's inverse.
-    extern bool solveCramer(const Matrix3 & A, const Vector3 & b, Vector3 * x);
-
-
-    // 4x4 matrix.
-    class NVMATH_CLASS Matrix
-    {
-    public:
-        typedef Matrix const & Arg;
-
-        Matrix();
-        explicit Matrix(float f);
-        explicit Matrix(identity_t);
-        Matrix(const Matrix3 & m);
-        Matrix(const Matrix & m);
-        Matrix(Vector4::Arg v0, Vector4::Arg v1, Vector4::Arg v2, Vector4::Arg v3);
-        //explicit Matrix(const float m[]);	// m is assumed to contain 16 elements
-
-        float data(uint idx) const;
-        float & data(uint idx);
-        float get(uint row, uint col) const;
-        float operator()(uint row, uint col) const;
-        float & operator()(uint row, uint col);
-        const float * ptr() const;
-
-        Vector4 row(uint i) const;
-        Vector4 column(uint i) const;
-
-        void zero();
-        void identity();
-
-        void scale(float s);
-        void scale(Vector3::Arg s);
-        void translate(Vector3::Arg t);
-        void rotate(float theta, float v0, float v1, float v2);
-        float determinant() const;
-
-        void operator+=(const Matrix & m);
-        void operator-=(const Matrix & m);
-
-        void apply(Matrix::Arg m);
-
-    private:
-        float m_data[16];
-    };
-
-    // Solve equation system using LU decomposition and back-substitution.
-    extern bool solveLU(const Matrix & A, const Vector4 & b, Vector4 * x);
-
-    // Solve equation system using Cramer's inverse.
-    extern bool solveCramer(const Matrix & A, const Vector4 & b, Vector4 * x);
-
-    // Compute inverse using LU decomposition.
-    extern Matrix inverseLU(const Matrix & m);
-
-    // Compute inverse using Gaussian elimination and partial pivoting.
-    extern Matrix inverse(const Matrix & m);
-    extern Matrix3 inverse(const Matrix3 & m);
-
-} // nv namespace
-
-#endif // NV_MATH_MATRIX_H