在meshLab的3D场景中绘制2D透明信息面板

来源:互联网 时间:1970-01-01

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);}
----------------

希望对你有用!  Good Luck.


相关阅读:
Top