public void TestMultiplyByInverse()
{
var inputMatrix = new FinMatrix4x4();
inputMatrix[0, 0] = 2;
inputMatrix[0, 1] = 5;
inputMatrix[0, 2] = 0;
inputMatrix[0, 3] = 8;
inputMatrix[1, 0] = 1;
inputMatrix[1, 1] = 4;
inputMatrix[1, 2] = 2;
inputMatrix[1, 3] = 6;
inputMatrix[2, 0] = 7;
inputMatrix[2, 1] = 8;
inputMatrix[2, 2] = 9;
inputMatrix[2, 3] = 3;
inputMatrix[3, 0] = 1;
inputMatrix[3, 1] = 5;
inputMatrix[3, 2] = 7;
inputMatrix[3, 3] = 8;
var inverseMatrix = inputMatrix.CloneAndInvert();
var actualMatrix = inputMatrix.CloneAndMultiply(inverseMatrix);
var expectedMatrix = new FinMatrix4x4().SetIdentity();
for (var r = 0; r < 4; r++)
{
for (var c = 0; c < 4; c++)
{
Assert.AreEqual(expectedMatrix[r, c], actualMatrix[r, c], .0001f);
}
}
}
public void TestInvert()
{
var inputMatrix = new FinMatrix4x4();
inputMatrix[0, 0] = 2;
inputMatrix[0, 1] = 5;
inputMatrix[0, 2] = 0;
inputMatrix[0, 3] = 8;
inputMatrix[1, 0] = 1;
inputMatrix[1, 1] = 4;
inputMatrix[1, 2] = 2;
inputMatrix[1, 3] = 6;
inputMatrix[2, 0] = 7;
inputMatrix[2, 1] = 8;
inputMatrix[2, 2] = 9;
inputMatrix[2, 3] = 3;
inputMatrix[3, 0] = 1;
inputMatrix[3, 1] = 5;
inputMatrix[3, 2] = 7;
inputMatrix[3, 3] = 8;
var actualMatrix = inputMatrix.CloneAndInvert();
var expectedMatrix = new FinMatrix4x4();
expectedMatrix[0, 0] = 172f / 179;
expectedMatrix[0, 1] = -343f / 179;
expectedMatrix[0, 2] = 14f / 179;
expectedMatrix[0, 3] = 80f / 179;
expectedMatrix[1, 0] = -185f / 179;
expectedMatrix[1, 1] = 422f / 179;
expectedMatrix[1, 2] = 12f / 179;
expectedMatrix[1, 3] = -136f / 179;
expectedMatrix[2, 0] = -1f / 179;
expectedMatrix[2, 1] = -49f / 179;
expectedMatrix[2, 2] = 2f / 179;
expectedMatrix[2, 3] = 37f / 179;
expectedMatrix[3, 0] = 95f / 179;
expectedMatrix[3, 1] = -178f / 179;
expectedMatrix[3, 2] = -11f / 179;
expectedMatrix[3, 3] = 65f / 179;
for (var r = 0; r < 4; r++)
{
for (var c = 0; c < 4; c++)
{
Assert.AreEqual(expectedMatrix[r, c], actualMatrix[r, c], .0001f);
}
}
}