Zigzag boundary when render with OpenGL

Originator:zhoujingjin92
Number:rdar://6468254635 Date Originated:
Status:Open Resolved:
Product: Product Version:
Classification:Suggestion Reproducible:always
 
When render with openGL in SCNRenderer, there is zigzag boundary. 
Render with openGL, SCNRender as a filter in filer chains, the final result have obvious zigzag boundaries.

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