// 范例P96.cpp : Defines the entry point for the console application.// #include "stdafx.h"#include <gl/glut.h> void display(){ glClear(GL_COLOR_BUFFER_BIT);     //清除所有像素 glColor3f(1.0,1.0,1.0);       //设置画笔白色 /*在缓存中绘制4对顶点坐标的矩形*/ GLdouble eqn[4]={0.0,1.0,0.0,0.0}; GLdouble eqn2[4]={1.0,0.0,0.0,0.0}; GLdouble eqn3[4]={0.0,0.0,1.0,0}; glPushMatrix(); glTranslatef(0.0,0.0,-5.0);      //模型变换  /*裁掉下半部分(y坐标小于0的部分)*/ glClipPlane(GL_CLIP_PLANE0,eqn);     glEnable(GL_CLIP_PLANE0);     /*裁掉左半部分(x坐标小于0的部分)*/ glClipPlane(GL_CLIP_PLANE1,eqn2); glEnable(GL_CLIP_PLANE1);  glRotatef(90.0,1.0,0.0,0.0); glutWireSphere(1.0,20,16); glPopMatrix();  glFlush();          //立即显示出来} void init(){ glClearColor(0.0,0.0,0.0,0.0);     //用黑色清除背景 glShadeModel(GL_FLAT);}void reshape(int w,int h){ glViewport(0,0,(GLsizei)w,(GLsizei)h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(30,(GLfloat)w/(GLfloat)h,0.1,20.0); glMatrixMode(GL_MODELVIEW);}int main(int argc,char ** argv){ glutInit(&argc,argv); glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB); glutInitWindowSize(500,500);     //初始化窗口大小 glutInitWindowPosition(100,100);    //初始化窗口位置 glutCreateWindow("hello");      //创建标题为“hello”的窗口 init();           //调用初始化函数 glutDisplayFunc(display);      //注册回调函数 glutReshapeFunc(reshape); glutMainLoop();         //进入主循环处理事件  return 0;}

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