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我完全不理解opengl + glut工作.... 请解释他为什么这么做? =(OpenGL和GLUT uncomprehension
我有简单的代码
void display() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glPushMatrix(); ChessboardSurrogate.Draw(6,8,50, 0,0); // draw chessboard(6x8) in (0,0,0) edge per cell 50 glPopMatrix(); glPushMatrix(); //glutSolidCube(100); //!!!!! glPopMatrix(); glLoadIdentity(); gluLookAt( 0.0, 0.0, -testSet::znear*2, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0); glMultMatrixf(_data->m); // my transformation matrix glutSwapBuffers(); }
,我得到预期的结果。screenshot #1
然后我去掉glutSolidCube(100)。在任何情况下,我甚至推/弹出电流矩阵,后来重写它的身份矩阵 ....我认为,我会看到与cude相同的结果图像... 但是!我看THIS screenshot #2什么..... & *^@#$ %W HY?
如果我添加代码
glRotatef(angleX,1.0,0.0,0.0); glRotatef(angleY,0.0,1.0,0.0);
glutSwapBuffers前,比我会看到当场棋盘..... screenshot #3