Matrix.Invert Method

Matrix Invert Method

Delta Engine Documentation

Namespace: DeltaEngine.Datatypes
Assembly: DeltaEngine (in DeltaEngine.dll) Version: 1.1.1.0 (1.1.1)

Syntax

public static Matrix Invert(
	Matrix matrix
)

public static Matrix Invert(
	Matrix matrix
)

Public Shared Function Invert ( 
	matrix As Matrix
) As Matrix

Public Shared Function Invert ( 
	matrix As Matrix
) As Matrix

public:
static Matrix Invert(
	Matrix matrix
)

public:
static Matrix Invert(
	Matrix matrix
)

static member Invert : 
        matrix : Matrix -> Matrix

static member Invert : 
        matrix : Matrix -> Matrix

Parameters

matrix: Type: DeltaEngine.Datatypes Matrix

Return Value

Type: Matrix

Remarks

Tests: DeltaEngine.Tests.Datatypes.MatrixTests

Examples

4 unit tests call DeltaEngine.Datatypes.Matrix.Invert(DeltaEngine.Datatypes.Matrix)

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[Test]
public void Invert()
{
    var expected1 = new Matrix(1, 0, 0, 0, 0, 0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 1);
    var expected2 = new Matrix(0, 0, 1, 0, 0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 0, 1);
    var expected3 = new Matrix(0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1);
    Assert.IsTrue(Matrix.Invert(Matrix.CreateRotationX(90.0f)).IsNearlyEqual(expected1));
    Assert.IsTrue(Matrix.Invert(Matrix.CreateRotationY(90.0f)).IsNearlyEqual(expected2));
    Assert.IsTrue(Matrix.Invert(Matrix.CreateRotationZ(90.0f)).IsNearlyEqual(expected3));
}

[Test]
public void Invert()
{
    var expected1 = new Matrix(1, 0, 0, 0, 0, 0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 1);
    var expected2 = new Matrix(0, 0, 1, 0, 0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 0, 1);
    var expected3 = new Matrix(0, -1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1);
    Assert.IsTrue(Matrix.Invert(Matrix.CreateRotationX(90.0f)).IsNearlyEqual(expected1));
    Assert.IsTrue(Matrix.Invert(Matrix.CreateRotationY(90.0f)).IsNearlyEqual(expected2));
    Assert.IsTrue(Matrix.Invert(Matrix.CreateRotationZ(90.0f)).IsNearlyEqual(expected3));
}

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[Test]
public void InvertTranspose()
{
    var source = new Matrix(-4, 0, 0, 0, -1, 2, 0, 0, -4, 4, 4, 0, -1, -9, -1, 1);
    var expected1 = new Matrix(-0.25f, -0.125f, -0.125f, -1.5f, 0, 0.5f, -0.5f, 4, 0, 0, 0.25f,
        0.25f, 0, 0, 0, 1);
    Assert.IsTrue(Matrix.InverseTranspose(source).IsNearlyEqual(expected1));
}

[Test]
public void InvertTranspose()
{
    var source = new Matrix(-4, 0, 0, 0, -1, 2, 0, 0, -4, 4, 4, 0, -1, -9, -1, 1);
    var expected1 = new Matrix(-0.25f, -0.125f, -0.125f, -1.5f, 0, 0.5f, -0.5f, 4, 0, 0, 0.25f,
        0.25f, 0, 0, 0, 1);
    Assert.IsTrue(Matrix.InverseTranspose(source).IsNearlyEqual(expected1));
}

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[Test]
public void InvertingTwiceReturnsTheOriginal()
{
    matrix = Matrix.CreateRotationY(60.0f);
    Assert.IsTrue(Matrix.Invert(Matrix.Invert(matrix)).IsNearlyEqual(matrix));
}

[Test]
public void InvertingTwiceReturnsTheOriginal()
{
    matrix = Matrix.CreateRotationY(60.0f);
    Assert.IsTrue(Matrix.Invert(Matrix.Invert(matrix)).IsNearlyEqual(matrix));
}