public void CanCreateOrthographicMatrix()
{
const float width = 10;
const float height = 10;
const float zNearPlane = 2;
const float zFarPlane = 20;
Matrix3D projectionMatrix = Matrix3D.CreateOrthographic(width, height, zNearPlane, zFarPlane);
AssertMatricesAreEqual(Matrix.OrthoRH(width, height, zNearPlane, zFarPlane), projectionMatrix);
}
/// <summary>
/// Creates the WorldViewProjection matrix from the perspective of the
/// light using the cameras bounding frustum to determine what is visible
/// in the scene.
/// </summary>
/// <returns>The WorldViewProjection for the light</returns>
private static Matrix3D CreateLightViewProjectionMatrix(Model model, Vector3D lightDirection)
{
// Matrix with that will rotate in points the direction of the light
Matrix3D lightRotation = Matrix3D.CreateLookAt(Point3D.Zero, -lightDirection, Vector3D.Up);
/*// Get the corners of the frustum
* Point3D[] frustumCorners = _cameraFrustum.GetCorners();
*
* // Transform the positions of the corners into the direction of the light
* for (int i = 0; i < frustumCorners.Length; i++)
* frustumCorners[i] = Point3D.Transform(frustumCorners[i], lightRotation);*/
// Find the smallest box around the points
//AxisAlignedBoundingBox lightBox = new AxisAlignedBoundingBox(frustumCorners);
AxisAlignedBox3D lightBox = model.SourceScene.Bounds;
lightBox.Transform(lightRotation);
//lightBox = lightBox.Transform(Matrix3D.CreateScale(2f));
Vector3D boxSize = lightBox.Max - lightBox.Min;
Vector3D halfBoxSize = boxSize * 0.5f;
// The position of the light should be in the center of the back
// pannel of the box.
Point3D lightPosition = lightBox.Min + halfBoxSize;
lightPosition.Z = lightBox.Min.Z;
// We need the position back in world coordinates so we transform
// the light position by the inverse of the lights rotation
lightPosition = Point3D.Transform(lightPosition, Matrix3D.Invert(lightRotation));
// Create the view matrix for the light
Matrix3D lightView = Matrix3D.CreateLookAt(lightPosition, -lightDirection, Vector3D.Up);
// Create the projection matrix for the light
// The projection is orthographic since we are using a directional light
Matrix3D lightProjection = Matrix3D.CreateOrthographic(boxSize.X * 2, boxSize.Y * 2, -boxSize.Z, boxSize.Z);
return(lightView * lightProjection);
}
public override Matrix3D GetProjectionMatrix(float aspectRatio)
{
return(Matrix3D.CreateOrthographic(Width, Width / aspectRatio,
NearPlaneDistance, FarPlaneDistance));
}
