I have this Heightmap that I created and when I try to put it in Roblox it renders the layout but the ground isn’t flat. Here are some pictures of what I’m talking about. If you have any tutorials on how to make a heightmap the correct way, it would be very helpful.
I’m guessing this happens due to image resolution being lower than terrain voxel size or whatever it’s called. You could try using the smooth tool and maybe the flatten tool.
I think the problem is that you are painting the heightmap vs importing either computer generated terrain or real world terrain. I think in order to use your drawn heightmap, you should apply a blur filter to your image before you import it. Those spiky peaks are due to bright pixels being next to less bright pixels(in close proximity).
like this:
That will make smoother elevation transitions.