gluLookAt、glViewport()、glOrtho和gluPerspective參數分析

一、 gluLookAt和投影      void gluLookAt(GLdouble eyex,GLdouble eyey,GLdouble eyez,GLdouble centerx,GLdouble centery,GLdouble centerz,GLdouble upx,GLdouble upy,GLdouble upz);   gluLookAt的前三個參數定義了觀察點的位置,但同時
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