求助，从一段c＋＋代码转c＃，在线等

void _stdcall display (void){ 
// glClearColor(1.0,0.0,1.0,1.0); //设置背景颜色 
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); //设置背景颜色 
glColor3f(1.0,1.0,0.0);//设置绘制图形所用颜色 //设置图形转换信息 
glLoadIdentity();            //清空矩阵 
glTranslatef(0.0,-1.0,-5.0); //把圆柱体向Y负方向平移1单位，向Z负方向平移5单位 
glRotatef(15.0,1.0,0.0,0.0); //把圆柱体绕X轴旋转15° 
//具体绘制图形 
for(int i=0;i <N;i++) 
drawSurface(&bottomVertex[i][0],&bottomVertex[i+1][0],&topVertex[i+1][0],&topVertex[i][0]); 
//绘制最后一个缺口 
drawSurface(&bottomVertex[N-1][0],&bottomVertex[0][0],&topVertex[0][0],&topVertex[N-1][0]); 
glFlush();//结束图形绘制的顶点给定，并最终输出至显示器完成图形的显示 
} 
void drawSurface(double *v1,double *v2,double *v3,double *v4) 
{ 
glBegin(GL_POLYGON);//绘制侧面 
glNormal3dv(v1); 
glVertex3dv(v1); glNormal3dv(v2); 
glVertex3dv(v2); glNormal3dv(v2); 
glVertex3dv(v3); glNormal3dv(v1); 
glVertex3dv(v4); 
glEnd(); 
glBegin(GL_TRIANGLES);//绘制上底 
glNormal3d(0.0,1.0,0.0);//法线向上 
glVertex3dv(v3); glNormal3d(0.0,1.0,0.0); 
glVertex3dv(O2); glNormal3d(0.0,1.0,0.0); 
glVertex3dv(v4); 
glEnd(); 
//因为下底面不接受光照，所以完全可以不绘制下底以加快速度 
/* glBegin(GL_TRIANGLES);//绘制下底 
glNormal3d(0.0,-1.0,0.0);//法线向下 
glVertex3dv(v2); glNormal3d(0.0,-1.0,0.0); 
glVertex3dv(O1); glNormal3d(0.0,-1.0,0.0); 
glVertex3dv(v1); 
glEnd(); 
*/ 
}