I haven’t hidden the ground grid, it just may not be well visible (you can see it in the new film ). The model is quite big, I had to enlarge it because when I exported it to .obj file and tried to use in a game prototype, it was too small and collision detection didn’t let camera to move (I checked with Irrlicht/FreeBasic and AppGameKit).
Zooming in and out doesn’t show more of the clipped building (as you can see here: https://youtu.be/pglLjxEXxUQ ) and AFAIR there wasn’t such effect in 0.91 version.
I hope it helps.