@Override
    public void write(JmeExporter e) throws IOException {
        super.write(e);
        OutputCapsule capsule = e.getCapsule(this);
        capsule.write(width, "width", 0);
        capsule.write(height, "height", 0);
    }
Create a quad with the given width and height. The quad
is always created in the XY plane.

@param width The X extent or width
@param height The Y extent or width
@param flipCoords If true, the texture coordinates will be flipped
along the Y axis.
jme3-core/src/main/java/com/jme3/scene/shape/Quad.java