Are there any alternative renderers for untiy?

Hey,
I know this may sound stupid at first, but I’ve thought a lot about it. Couldn’t one implement an open source renderer like OGRE or Irrlicht in unity? We can access the mesh data and the materials/shaders. We are not forced to use the default camera but could instead just use an empty with a custom camera component on it.
I understand that since pretty much every renderer uses c++ (or something of similarly low level) such a plugin would require people to use unity pro.
But even so, I haven’t even found anyone ever trying this. Am I missing something obvious here? Wouldn’t it be useful to have open source access to the render engine?

cheers,
kiriri

You could implement one, it would be pretty straight forward. But I guess people buy Unity so they don’t have to bother doing that. You can either spend your time working on game engines, or making games.

Why would you want to use a slower engine with less features like ogre? I think you might not be aware of how much unity can do.