diff -r 767592024ec5 -r 4c41bfe2ec6e src/matrix.cpp
--- a/src/matrix.cpp	Sun Jan 26 01:06:27 2020 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,81 +0,0 @@
-/*
- *  LDForge: LDraw parts authoring CAD
- *  Copyright (C) 2013 - 2020 Teemu Piippo
- *
- *  This program is free software: you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-#include "matrix.h"
-#include "vertex.h"
-
-Matrix4x4 combine(const Matrix3x3& topLeft, const Point3D& translation)
-{
-	return {{
-		{topLeft(0, 0), topLeft(0, 1), topLeft(0, 2), translation.x},
-		{topLeft(1, 0), topLeft(1, 1), topLeft(1, 2), translation.y},
-		{topLeft(2, 0), topLeft(2, 1), topLeft(2, 2), translation.z},
-		{0, 0, 0, 1}
-	}};
-}
-
-/*
- * Computes the determinant of a 3×3 matrix with each variable passed in row-major order.
- */
-qreal math::det(qreal a, qreal b, qreal c, qreal d, qreal e, qreal f, qreal g, qreal h, qreal i)
-{
-	return a*e*i + b*f*g + c*d*h - a*f*h - b*d*i - c*e*g;
-}
-
-/*
- * Computes the determinant of a 2×2 matrix.
- */
-qreal math::det(const Matrix<2, 2>& matrix)
-{
-	return matrix(0, 0) * matrix(1, 1) - matrix(0, 1) * matrix(1, 0);
-}
-
-/*
- * Computes the determinant of a 3×3 matrix.
- */
-qreal math::det(const Matrix3x3& matrix)
-{
-	return math::sum(
-		+matrix(0, 0) * matrix(1, 1) * matrix(2, 2),
-		-matrix(0, 0) * matrix(1, 2) * matrix(2, 1),
-		-matrix(0, 1) * matrix(1, 0) * matrix(2, 2),
-		+matrix(0, 1) * matrix(1, 2) * matrix(2, 0),
-		+matrix(0, 2) * matrix(1, 0) * matrix(2, 1),
-		-matrix(0, 2) * matrix(1, 1) * matrix(2, 0));
-}
-
-/*
- * Computes the determinant of a 4×4 matrix.
- */
-qreal math::det(const Matrix4x4& matrix)
-{
-	qreal sum = 0;
-
-	for (int column : {0, 1, 2, 3})
-	{
-		int column_1 = (column >= 1) ? 0 : 1;
-		int column_2 = (column >= 2) ? 1 : 2;
-		int column_3 = (column >= 3) ? 2 : 3;
-		sum += ((column % 1) ? -1 : 1) * math::det(
-			matrix(1, column_1), matrix(1, column_2), matrix(1, column_3),
-			matrix(2, column_1), matrix(2, column_2), matrix(2, column_3),
-			matrix(3, column_1), matrix(3, column_2), matrix(3, column_3));
-	}
-
-	return sum;
-}