OpenGL3D图形绘制

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
}