GLfloat        xtri;                        GLfloat        ytri; GLfloat        ztri; int DrawGLScene(GLvoid)                                // 从这里开始进行所有的绘制 {
       glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    // 清除屏幕及深度缓存     glLoadIdentity();                    // 重置模型观察矩阵     glTranslatef(-0.0f,0.0f,-6.0f);                // 左移 1.5 单位，并移入屏幕 6.0     glRotatef(xtri,1.0f,0.0f,0.0f);                // 绕Y轴旋转金字塔     glRotatef(ytri,0.0f,1.0f,0.0f);                // 绕Y轴旋转金字塔         glRotatef(ztri,0.0f,0.0f,1.0f);                // 绕Y轴旋转金字塔     glBegin(GL_TRIANGLES);                    // 开始绘制金字塔的各个面                 glColor3f(1.0f,0.0f,0.0f);            // 红色         glVertex3f( 0.0f, 1.0f, 0.0f);            // 三角形的上顶点 (前侧面)         glColor3f(0.0f,1.0f,0.0f);            // 绿色         glVertex3f(-1.0f,-0.0f, 1.0f);            // 三角形的左下顶点 (前侧面)         glColor3f(0.0f,0.0f,1.0f);            // 蓝色         glVertex3f( 1.0f,-0.0f, 1.0f);            // 三角形的右下顶点 (前侧面)                  glColor3f(1.0f,0.0f,0.0f);            // 红色         glVertex3f( 0.0f, 1.0f, 0.0f);            // 三角形的上顶点 (右侧面)         glColor3f(0.0f,0.0f,1.0f);            // 蓝色         glVertex3f( 1.0f,-0.0f, 1.0f);            // 三角形的左下顶点 (右侧面)         glColor3f(0.0f,1.0f,0.0f);            // 绿色         glVertex3f( 1.0f,-0.0f, -1.0f);            // 三角形的右下顶点 (右侧面)                  glColor3f(1.0f,0.0f,0.0f);            // 红色         glVertex3f( 0.0f, 1.0f, 0.0f);            // 三角形的上顶点 (后侧面)         glColor3f(0.0f,1.0f,0.0f);            // 绿色         glVertex3f( 1.0f,-0.0f, -1.0f);            // 三角形的左下顶点 (后侧面)         glColor3f(0.0f,0.0f,1.0f);            // 蓝色         glVertex3f(-1.0f,-0.0f, -1.0f);            // 三角形的右下顶点 (后侧面)                  glColor3f(1.0f,0.0f,0.0f);            // 红色         glVertex3f( 0.0f, 1.0f, 0.0f);            // 三角形的上顶点 (左侧面)         glColor3f(0.0f,0.0f,1.0f);            // 蓝色         glVertex3f(-1.0f,-0.0f,-1.0f);            // 三角形的左下顶点 (左侧面)         glColor3f(0.0f,1.0f,0.0f);            // 绿色         glVertex3f(-1.0f,-0.0f, 1.0f);            // 三角形的右下顶点 (左侧面)     glEnd();                        // 金字塔绘制结束     glBegin(GL_QUADS);                    // 开始绘制金字塔的底部                glColor3f(0.0f,1.0f,0.0f);            // 绿色         glVertex3f(-1.0f, 0.0f,1.0f);            // 四边形的右上顶点 (顶面)         glColor3f(0.0f,0.0f,1.0f);            // 蓝色         glVertex3f(1.0f, 0.0f,1.0f);            // 四边形的左上顶点 (顶面)         glColor3f(0.0f,1.0f,0.0f);            // 绿色         glVertex3f(1.0f, 0.0f, -1.0f);            // 四边形的左下顶点 (顶面)         glColor3f(0.0f,0.0f,1.0f);            // 蓝色         glVertex3f( -1.0f, 0.0f, -1.0f);            // 四边形的右下顶点 (顶面)     glEnd();     xtri+=0.8f;                            ytri+=0.5f;     ztri+=0.9f; return TRUE;                                //  一切 OK }