Generating 3D terrain

I am trying to generate 3D terrain from .png file using GeoMipTerrain and setHeightfield
How many bit png image should be used to get high quality terrain

Usually 16-bit pngs are used as heightfield images.
If you use 8-bit, the precision will most likely not be enough and you will get “stairs” on your terrain.

Yes 16 bit unsigned png image works best as heightfield. Thankyou.