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很奇怪的: 关于 OpenGL drawing in a QGraphicsView.

--------------------编程问答-------------------- I revised the line to : glPolygonMode(GL_BACK, GL_LINE);  the problem still exists,

HHHOoooWWwwever, glPolygonMode(GL_FRONT, GL_LINE); sloved the problem and the two items come out to be as expected.

Why?
补充:移动开发 ,  Qt
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