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假设我们要使某一24位色的Texture（不带Alpha）对应的特定颜色在render时透明，可以先调用makeColorKeyTexture创建一个 1 bit alpha channel of the texture，然后把MaterialType设为EMT_TRANSPARENT_ALPHA_CHANNEL就搞定了。废话不多说了， 请看代码：

 scene::IAnimatedMesh* meshRabbit = smgr->getMesh("../../media/mouse22.ms3d");
 scene::IAnimatedMeshSceneNode* anodeRabbit = smgr->addAnimatedMeshSceneNode(meshRabbit);
 if(anodeRabbit)
 {
  driver->setTextureCreationFlag(video::ETCF_ALWAYS_16_BIT ,true);
  irr::video::ITexture* pTexture = driver->getTexture("../../media/wenli.jpg");
  driver->makeColorKeyTexture(pTexture,  core::position2d< s32 >(300,30));
 
  anodeRabbit->setMaterialTexture(0, pTexture);
  anodeRabbit->setMaterialType(video::EMT_TRANSPARENT_ALPHA_CHANNEL  );
  anodeRabbit->setPosition(core::vector3df(70,20,-60));
  anodeRabbit->setMaterialFlag(video::EMF_LIGHTING, false);
  anodeRabbit->setRotation(core::vector3df(0,180.0f,0));
  anodeRabbit->setAnimationSpeed(25*30);
 }

当然如果Texture本身就带alpha channel的话就不需要再makeColorKeyTexture了，另外还有两种模式可以尝试： EMT_TRANSPARENT_ADD_COLOR 和  EMT_TRANSPARENT_ALPHA_CHANNEL_REF。