具体的方法是将投影方式切换为平行投影，然后进行2D绘制，最后将其映射到二维屏幕之上。

注：2D透明场景信息面板即为下图3D绘图区下方紫色透明区域

核心代码如下：

void GLArea::displayInfo(){	// Enter in 2D screen Mode again	glMatrixMode(GL_PROJECTION);	glPushMatrix();	glLoadIdentity();	glOrtho(-1,1,-1,1,-1,1);	glMatrixMode(GL_MODELVIEW);	glPushMatrix();	glLoadIdentity();	glPushAttrib(GL_ENABLE_BIT);	glDisable(GL_DEPTH_TEST);	glDisable(GL_LIGHTING);	glDisable(GL_TEXTURE_2D);	glEnable(GL_BLEND);	glBlendFunc(GL_ONE,GL_SRC_ALPHA);        // set display info pane color    	glColor(logAreaColor);        //  barHeight is the height of pane	glBegin(GL_QUADS);    glVertex2f(-1.f,barHeight);     glVertex2f(-1.f,-1.f);    glVertex2f( 1.f,-1.f);          glVertex2f( 1.f,barHeight);	glEnd();

// Render text is dismiss	// Closing 2D	glPopAttrib();	glPopMatrix(); // restore modelview	glMatrixMode(GL_PROJECTION);	glPopMatrix();	glMatrixMode(GL_MODELVIEW);}

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希望对你有用！  Good Luck.