Show Tk2dsprite Above Ngui Show 2dtoolkit sprite on NGUI panel

idea

use a third camera to show the above ui tk2dSprite

setting

layers(camera depth) : Default(1),UILayer(10),AboveUILayer(20)

about clip

• Add UIViewport to AboveUILayer camera
• set source camera to UILayer camera
• add topleft,bottomright to clipping panel

known issues if clipped:

if tk2dSprite is a child of UIWidget,and UIWidget have a scale animation,these two will not scale like one object. because AboveUILayer camera viewport rect and orthographic size different from UILayer camera