对不同物体进行模型变换glPushMatrix不能嵌套

   意思是，假如对三个物体要进行同样的平移操作，我本来的思路是给加一次变换就行~~如下代码：

glPushMatrix();   
    glTranslatef(3200,-2500,0);
    glRotatef(90,1.0,0.0,0.0);
    glRotatef(-175,0.0,1.0,0.0);

    glPushMatrix();
    　　DrawObject1();
    glPopMatrix();
    glPushMatrix();
    　　DrawObject2();
    glPopMatrix();

    glPushMatrix();
    　　DrawObject3();
    glPopMatrix();        
glPopMatrix();

结果是只有第一个物体进行了模型变换，第二个和第三个都木有。so,只能这样了：

 glPushMatrix();
     glTranslatef(3200,-2500,0);
     glRotatef(90,1.0,0.0,0.0);
     glRotatef(-175,0.0,1.0,0.0);
     DrawObject1();
    glPopMatrix();


    glPushMatrix();
     glTranslatef(3200,-2500,0);
     glRotatef(90,1.0,0.0,0.0);
     glRotatef(-175,0.0,1.0,0.0);
     DrawObject2();
    glPopMatrix();

    glPushMatrix();
     glTranslatef(3200,-2500,0);
     glRotatef(90,1.0,0.0,0.0);
     glRotatef(-175,0.0,1.0,0.0);
     DrawObject3();
    glPopMatrix();        

小问题，记录下来~~