给场景添加一个背景

相当于一个Overlay一样的二维的平面, 不过是把它放到开始渲染, 放在模型后面

 

Ogre::Rectangle2D *rect3d = new Ogre::Rectangle2D(true);
    rect3d->setCorners(-1.0f, 1.0f, 1.0f, -1.0f);
    rect3d->setMaterial("Examples/OgreLogo");

    MaterialPtr material=MaterialManager::getSingleton().getByName("Examples/OgreLogo");

    material->getTechnique(0)->getPass(0)->setDepthCheckEnabled(false);
    material->getTechnique(0)->getPass(0)->setDepthWriteEnabled(false);

    rect3d->setRenderQueueGroup(RENDER_QUEUE_SKIES_EARLY+1);
    rect3d->setBoundingBox(Ogre::AxisAlignedBox(-100000.0*Ogre::Vector3::UNIT_SCALE, 100000.0*Ogre::Vector3::UNIT_SCALE));
    Ogre::SceneNode* node = mSceneMgr->getRootSceneNode()->createChildSceneNode("GridSN");
    node->attachObject(rect3d);