public void Invert_NotInvertible_ThrowsInvalidOperationException()
{
// Arrange
var mat = new Matrix4f(
new Vector4f(1, 2, 3, 4),
new Vector4f(5, 6, 7, 8),
new Vector4f(9, 10, 11, 12),
new Vector4f(13, 14, 15, 16));
// Act
TestDelegate invert = () => mat.Invert();
// Assert
Assert.That(invert, Throws.InvalidOperationException);
}
public void Invert_ReturnsInvertedMatrix()
{
// Arrange
var mat = new Matrix4f(
new Vector4f(4, 0, 0, 0),
new Vector4f(0, 0, 2, 0),
new Vector4f(0, 1, 2, 0),
new Vector4f(1, 0, 0, 1) );
// Act
var resultMat = mat.Invert();
var results = new[] {resultMat.Row(0), resultMat.Row(1), resultMat.Row(2), resultMat.Row(3)};
// Assert
Assert.That(results, Is.EquivalentTo(new []
{
new Vector4f(0.25f, 0, 0, 0),
new Vector4f(0, -1, 1, 0),
new Vector4f(0, 0.5f, 0, 0),
new Vector4f(-0.25f, 0, 0, 1)
}));
}
