OpenGL3D圖形繪制

GLfloat        xtri;                        
GLfloat        ytri;
GLfloat        ztri;
int DrawGLScene(GLvoid)                                // 從這里開始進行所有的繪制
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    // 清除屏幕及深度緩存
    glLoadIdentity();                    // 重置模型觀察矩陣
    glTranslatef(-0.0f,0.0f,-6.0f);                // 左移 1.5 單位，並移入屏幕 6.0

    glRotatef(xtri,1.0f,0.0f,0.0f);                // 繞Y軸旋轉金字塔
    glRotatef(ytri,0.0f,1.0f,0.0f);                // 繞Y軸旋轉金字塔
        glRotatef(ztri,0.0f,0.0f,1.0f);                // 繞Y軸旋轉金字塔

    glBegin(GL_TRIANGLES);                    // 開始繪制金字塔的各個面
        
        glColor3f(1.0f,0.0f,0.0f);            // 紅色
        glVertex3f( 0.0f, 1.0f, 0.0f);            // 三角形的上頂點 (前側面)
        glColor3f(0.0f,1.0f,0.0f);            // 綠色
        glVertex3f(-1.0f,-0.0f, 1.0f);            // 三角形的左下頂點 (前側面)
        glColor3f(0.0f,0.0f,1.0f);            // 藍色
        glVertex3f( 1.0f,-0.0f, 1.0f);            // 三角形的右下頂點 (前側面)
         
    
        glColor3f(1.0f,0.0f,0.0f);            // 紅色
        glVertex3f( 0.0f, 1.0f, 0.0f);            // 三角形的上頂點 (右側面)
        glColor3f(0.0f,0.0f,1.0f);            // 藍色
        glVertex3f( 1.0f,-0.0f, 1.0f);            // 三角形的左下頂點 (右側面)
        glColor3f(0.0f,1.0f,0.0f);            // 綠色
        glVertex3f( 1.0f,-0.0f, -1.0f);            // 三角形的右下頂點 (右側面)
         
    
        glColor3f(1.0f,0.0f,0.0f);            // 紅色
        glVertex3f( 0.0f, 1.0f, 0.0f);            // 三角形的上頂點 (后側面)
        glColor3f(0.0f,1.0f,0.0f);            // 綠色
        glVertex3f( 1.0f,-0.0f, -1.0f);            // 三角形的左下頂點 (后側面)
        glColor3f(0.0f,0.0f,1.0f);            // 藍色
        glVertex3f(-1.0f,-0.0f, -1.0f);            // 三角形的右下頂點 (后側面)
         
    
        glColor3f(1.0f,0.0f,0.0f);            // 紅色
        glVertex3f( 0.0f, 1.0f, 0.0f);            // 三角形的上頂點 (左側面)
        glColor3f(0.0f,0.0f,1.0f);            // 藍色
        glVertex3f(-1.0f,-0.0f,-1.0f);            // 三角形的左下頂點 (左側面)
        glColor3f(0.0f,1.0f,0.0f);            // 綠色
        glVertex3f(-1.0f,-0.0f, 1.0f);            // 三角形的右下頂點 (左側面)
    glEnd();                        // 金字塔繪制結束

    glBegin(GL_QUADS);                    // 開始繪制金字塔的底部        
        glColor3f(0.0f,1.0f,0.0f);            // 綠色
        glVertex3f(-1.0f, 0.0f,1.0f);            // 四邊形的右上頂點 (頂面)
        glColor3f(0.0f,0.0f,1.0f);            // 藍色
        glVertex3f(1.0f, 0.0f,1.0f);            // 四邊形的左上頂點 (頂面)
        glColor3f(0.0f,1.0f,0.0f);            // 綠色
        glVertex3f(1.0f, 0.0f, -1.0f);            // 四邊形的左下頂點 (頂面)
        glColor3f(0.0f,0.0f,1.0f);            // 藍色
        glVertex3f( -1.0f, 0.0f, -1.0f);            // 四邊形的右下頂點 (頂面)
    glEnd();

    xtri+=0.8f;                        
    ytri+=0.5f;
    ztri+=0.9f;

    return TRUE;                                //  一切 OK
}