ogre render to texture 设置透明

这个问题其实就是 rtt+texture设置透明

代码如下

    Ogre::TexturePtr rtt_texture = Ogre::TextureManager::getSingleton().createManual("RttTex", Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME, 
        Ogre::TEX_TYPE_2D, mWindow->getWidth(), mWindow->getHeight(), 0, Ogre::PF_R8G8B8, Ogre::TU_RENDERTARGET);

    Ogre::RenderTexture *renderTexture = rtt_texture->getBuffer()->getRenderTarget();

    renderTexture->addViewport(mCamera);
    renderTexture->getViewport(0)->setClearEveryFrame(true);
    renderTexture->getViewport(0)->setBackgroundColour(Ogre::ColourValue::Black);
    renderTexture->getViewport(0)->setOverlaysEnabled(false);


    renderTexture->update();
    renderTexture->writeContentsToFile("start.png");

    mMiniScreen = new Ogre::Rectangle2D(true);
    mMiniScreen->setCorners(0.5f, -0.5f, 1.0f, -1.0f);
    mMiniScreen->setBoundingBox(Ogre::AxisAlignedBox(-100000.0f * Ogre::Vector3::UNIT_SCALE, 100000.0f * Ogre::Vector3::UNIT_SCALE));


    Ogre::SceneNode* miniScreenNode = mSceneMgr->getRootSceneNode()->createChildSceneNode("MiniScreenNode");

    miniScreenNode->attachObject(mMiniScreen);

    Ogre::MaterialPtr renderMaterial = Ogre::MaterialManager::getSingleton().create("RttMat", Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
    Ogre::Technique* matTechnique = renderMaterial->createTechnique();
    matTechnique->createPass();
    renderMaterial->getTechnique(0)->getPass(0)->setLightingEnabled(false);
    renderMaterial->getTechnique(0)->getPass(0)->createTextureUnitState("RttTex");

    renderMaterial->getTechnique(0)->getPass(0)->setSceneBlending(Ogre::SBT_TRANSPARENT_ALPHA);//SBT_TRANSPARENT_COLOUR

    //material->getTechnique(0)->getPass(0)->setTransparentSortingEnabled(true);

    renderMaterial->getTechnique(0)->getPass(0)->getTextureUnitState(0)->setAlphaOperation(Ogre::LBX_MODULATE, Ogre::LBS_TEXTURE, Ogre::LBS_MANUAL,1.0, 0.1); // 0.8为透明度
    
    mMiniScreen->setMaterial("RttMat");

    Ogre::TexturePtr rtt_texture = Ogre::TextureManager::getSingleton().createManual("RttTex", Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME, 
        Ogre::TEX_TYPE_2D, mWindow->getWidth(), mWindow->getHeight(), 0, Ogre::PF_R8G8B8, Ogre::TU_RENDERTARGET);

    Ogre::RenderTexture *renderTexture = rtt_texture->getBuffer()->getRenderTarget();

    renderTexture->addViewport(mCamera);
    renderTexture->getViewport(0)->setClearEveryFrame(true);
    renderTexture->getViewport(0)->setBackgroundColour(Ogre::ColourValue::Black);
    renderTexture->getViewport(0)->setOverlaysEnabled(false);


    renderTexture->update();
    renderTexture->writeContentsToFile("start.png");

    mMiniScreen = new Ogre::Rectangle2D(true);
    mMiniScreen->setCorners(0.5f, -0.5f, 1.0f, -1.0f);
    mMiniScreen->setBoundingBox(Ogre::AxisAlignedBox(-100000.0f * Ogre::Vector3::UNIT_SCALE, 100000.0f * Ogre::Vector3::UNIT_SCALE));


    Ogre::SceneNode* miniScreenNode = mSceneMgr->getRootSceneNode()->createChildSceneNode("MiniScreenNode");

    miniScreenNode->attachObject(mMiniScreen);

    Ogre::MaterialPtr renderMaterial = Ogre::MaterialManager::getSingleton().create("RttMat", Ogre::ResourceGroupManager::DEFAULT_RESOURCE_GROUP_NAME);
    Ogre::Technique* matTechnique = renderMaterial->createTechnique();
    matTechnique->createPass();
    renderMaterial->getTechnique(0)->getPass(0)->setLightingEnabled(false);
    renderMaterial->getTechnique(0)->getPass(0)->createTextureUnitState("RttTex");

    renderMaterial->getTechnique(0)->getPass(0)->setSceneBlending(Ogre::SBT_TRANSPARENT_ALPHA);//SBT_TRANSPARENT_COLOUR

    //material->getTechnique(0)->getPass(0)->setTransparentSortingEnabled(true);

    renderMaterial->getTechnique(0)->getPass(0)->getTextureUnitState(0)->setAlphaOperation(Ogre::LBX_MODULATE, Ogre::LBS_TEXTURE, Ogre::LBS_MANUAL,1.0, 0.1); // 0.8为透明度
    
    mMiniScreen->setMaterial("RttMat");

终于会插入代码了 不用一点点 回车了 。。

这段内容比较多 除了 取出rtt 设置 透明 还有些别的内容

这段内容 是单独设置纹理透明的：

方法一 材质脚本模板:

material Template/TransparentTexture
 {
   technique
   {
     pass
     {
       lighting off
       scene_blend alpha_blend
       depth_write off
 
       texture_unit
       {
         texture image.png
         alpha_op_ex source1 src_manual src_texture 0.5      
       }
     }
   }
 }
 
方法二 程序代码:

material->getTechnique(0)->getPass(0)->setSceneBlending(Ogre::SBT_TRANSPARENT_ALPHA);//SBT_TRANSPARENT_COLOUR

//material->getTechnique(0)->getPass(0)->setTransparentSortingEnabled(true);

material->getTechnique(0)->getPass(0)->getTextureUnitState(0)->setAlphaOperation(Ogre::LBX_MODULATE, Ogre::LBS_TEXTURE, Ogre::LBS_MANUAL,1.0, 0.8); // 0.8为透明度