/// <summary>
/// Gets the total transform of the specified visual.
/// </summary>
/// <param name="viewport">The viewport.</param>
/// <param name="visual">The visual.</param>
/// <returns>The transform.</returns>
public static GeneralTransform3D GetTransform(this Viewport3D viewport, Visual3D visual)
{
if (visual == null)
{
return(null);
}
foreach (var ancestor in viewport.Children)
{
if (visual.IsDescendantOf(ancestor))
{
var g = new GeneralTransform3DGroup();
// this includes the visual.Transform
var ta = visual.TransformToAncestor(ancestor);
if (ta != null)
{
g.Children.Add(ta);
}
// add the transform of the top-level ancestor
g.Children.Add(ancestor.Transform);
return(g);
}
}
return(visual.Transform);
}
public static Point?From3Dto2D(Visual3D space, Visual surface, Camera perspectiveCamera, Point3D target)
{
PerspectiveCamera cmr = perspectiveCamera as PerspectiveCamera;
Point? rlt = new Point();
Vector3D look = cmr.Transform.Transform(cmr.LookDirection);
Vector3D d = target - cmr.Transform.Transform(cmr.Position);
double angle = AngleBetween(d, look);
GeneralTransform3DTo2D gt = space.TransformToAncestor(surface);
rlt = gt.Transform(target);
if (Math.Abs(angle) < cmr.FieldOfView / 2)
{
return(rlt);
}
return(null);
}