Irrlicht Engine

Alright. I just solved, with the help of some other threads here, the infamous transparent material z-buffering problem as it existed in my project. However, I'm kinda curious-

Driver->setAllowZWriteOnTransparent(true);

apparently did nothing, while

Scenemanager->getParameters()->setAttribute ...

Alright. This is exactly the issue I'm running into, and it's driving me nuts, and I could really use an OpenGL solution since for my particular project (NDA, sorry) DirectX isn't going to be an option.

Obviously OpenGL can handle things correctly, as evidenced by Per Pixel Lighting example 11. But ...

Now that I can play with multitexturing and normal/parallax mapping (and the shaders I'm assuming get written implicitly for normal/parallax), I'm wondering if there's a quick way to tell Irrlicht to rebuild the parallax shader and/or update the relevant inputs manually, e.g. when I know the camera ...

Would I be right in hypothesizing that the Burning renderer doesn't do directional lights? I'm currently wrapping my head around the engine with some simple coding trials on a stock cube. I have a directional light made with

scene::ILightSceneNode* light2 =
smgr->addLightSceneNode(0, core ...