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transparency masking?

By Kang on Wed, 06/20/2012 - 17:09

I want to make only a part of AR object visible. For example, as in the attached image, a part of brown object is shown only on the red circle and the rest of the object is not visible. How can I implement such a masking effect in opengl es 2.0? I'm a newbie to opengl es. Please help me detailed advice or instructions. Thanks in advance.