Projections are a simplified API for using transforms that simulate a 3-D effect in Silverlight rendering by projecting the object on a plane, then transforming that plane.
To establish a projection, you set the Projection property on any UIElement. In XAML, you set this using property element syntax, with value of an object element that is either PlaneProjection or Matrix3DProjection.
ProjectionMatrix is the only settable property of Matrix3DProjection. In XAML, you use property element syntax, with value of an object element that is a Matrix3D, and individual properties of Matrix3D set on the Matrix3D object element as attributes.