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text is not transparent

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text is not transparent
« on: July 21, 2018, 20:16:02 »
I 'm new to LWJGL and feel it good. I build my UIObj  class use the method in bood "3d game development with LWJGL" chapter twelve and it should transparent because I have already add the following lines

but the two UI Obj seems not transparent when they overlap. Their background are glclearColor which I set at the beginning of the program.
Did anybody meet this situation?