Irrlicht Engine

Haha, I can see why. , yeah placing terrain should be quick, it's a quite major thing to do after all .

Also, I can't see why the polygon count limit for static meshes are there. Is this continued in to irrlicht?

As many have said before, it's one great tool. The only thing it lacks before you can start doing some real level editing is terrain, which I know (by the terrain button), will come. I've just one idea for how it might work. Loading height maps and stuff do work, but making a true earth sculptor ...