/// <summary>
/// Gets the object space to world space transformation for the given Visual3D
/// </summary>
/// <param name="visual3DStart">The visual whose world space transform should be found</param>
/// <param name="viewport">The containing Viewport3D for the Visual3D</param>
/// <returns>The world space transformation</returns>
internal static Matrix3D GetWorldTransformationMatrix(Visual3D visual3DStart, out Viewport3DVisual viewport)
{
DependencyObject dependencyObject = visual3DStart;
Matrix3D worldTransform = Matrix3D.Identity;
while (dependencyObject != null)
{
Visual3D visual3D = dependencyObject as Visual3D;
// we reached the top
if (visual3D == null)
{
break;
}
Transform3D transform = (Transform3D)visual3D.GetValue(Visual3D.TransformProperty);
if (transform != null)
{
transform.Append(ref worldTransform);
}
dependencyObject = VisualTreeHelper.GetParent(dependencyObject);
}
if (dependencyObject != null)
{
viewport = (Viewport3DVisual)dependencyObject;
}
else
{
viewport = null;
}
return(worldTransform);
}