/// <summary>
/// Gets a vector pointing out along a given pixel coordinate on the screen.
/// </summary>
/// <param name="point">The screen position in pixels.</param>
public Vector3 ScreenPointToWorldDirection(Vector2 point)
{
ValidateDispose();
Vector3 clipPoint = new Vector3(
2.0f * ((point.X / m_resolutionX) - 0.5f),
2.0f * (-((point.Y / m_resolutionY) - 0.5f)),
1.0f
);
Vector3 worldPoint = Vector3.TransformPerspective(clipPoint, ProjectionMatrix.Inverted() * ViewMatrixInverse);
return((worldPoint - Transform.Position).Normalized());
}
public Ray3d GetMouseRay()
{
var start = new Vector4d((Window.Mouse.X / (double)Window.Width - 0.5) * 2.0, ((Window.Height - Window.Mouse.Y) / (double)Window.Height - 0.5) * 2.0, 0.0, 1.0);
var end = new Vector4d((Window.Mouse.X / (double)Window.Width - 0.5) * 2.0, ((Window.Height - Window.Mouse.Y) / (double)Window.Height - 0.5) * 2.0, -1.0, 1.0);
var IPV = ProjectionMatrix.Inverted() * ViewMatrix.Inverted();
start = Vector4d.Transform(start, IPV);
start /= start.W;
end = Vector4d.Transform(end, IPV);
end /= end.W;
end -= start;
return(new Ray3d(new Vector3d(start.X, start.Y, start.Z), new Vector3d(end.X, end.Y, end.Z).Normalized()));
}