Use ogre rtt in cegui 0.8

本文介绍如何使用Ogre与CEGUI实现实时更新渲染目标纹理的过程。包括设置Ogre纹理、配置CEGUI图像及其区域,并确保窗口正确渲染更新后的纹理。还特别注意了在帧窗口中避免使用自动渲染表面选项。

Ogre rtt in cegui  0.8


It's easy to display ogre rtt in cegui, but something should be taking care of.

1. set up ogre texture

mpOgreTexture = &static_cast<CEGUI::OgreTexture&>(getOgreRenderer()->createTexture("OgreTexture"));

mpOgreTexture->setOgreTexture(ogreRtt);   

2. set up cegui image, don't forget the image area.

mpImage = static_cast<CEGUI::BasicImage*>(&CEGUI::ImageManager::getSingleton().create("BasicImage",imageName));

mpImage ->setTexture(mpOgreTexture);

CEGUI::Rectf imageArea(0.0f, 0.0f, yourRttWidth, yourRttHeight);

mpImage->setArea(imageArea);

mpImage->setAutoScaled(CEGUI::ASM_Disabled);

3. set image property of your cegui window at last.

mpimgTex->setProperty("Image", imageName);


Be careful
      If your cegui window resides in FrameWindow, you must turn AutoRenderingSurface to false, 
      otherwise cegui will use imagery cash to display rtt.
      If you change rtt to another one at realtime, you need to call,
            mpimgTex->invalidate();
      this tell cegui to change texture, otherwise it will sill use display previous rtt.


       

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