opengl绘制桌子

#include <GL/glut.h>
 #include"math.h"

   GLint winWidth = 600, winHeight = 600;   

   GLfloat x = -40.0, y = 200.0, z = 250;  
   GLfloat xref = 50.0, yref = 50.0, zref = 50.0;  
   GLfloat Vx = 0.0, Vy = 1.0, Vz = 0.0;          

   GLfloat xwMin = -20.0, ywMin = -20.0, xwMax = 20.0, ywMax =20.0;

   GLfloat dnear = 20.0, dfar = 400.0; 

   void init (void)
   {
      glClearColor (1.0, 1.0, 1.0, 0.0);   //背景颜色
      glMatrixMode (GL_MODELVIEW);
      gluLookAt (x, y, z, xref, yref, zref, Vx, Vy, Vz);
      glMatrixMode (GL_PROJECTION);
      glFrustum (xwMin, xwMax, ywMin, ywMax, dnear, dfar);

  GLfloat mat_specular[]={0.0,0.0,1.0,0.0};
  GLfloat light_position[]={70.0,80.0,80.0,1.0};   //光的位置
  GLfloat white_light[]={1.0,0.2,0.8,1.0};  //  
  GLfloat light0_ambient[]={0.2,0.8,0.2,1.0};     //环境光的光照

  glLightfv(GL_LIGHT0,GL_POSITION,light_position);  //指定光源位置
  glLightfv(GL_LIGHT0,GL_DIFFUSE,white_light);    //漫反射
  glLightfv(GL_LIGHT0,GL_SPECULAR,white_light);   //镜面反射
                   glLightfv(GL_LIGHT0,GL_AMBIENT,light0_ambient);  //环境光