hou to fix the mesh generator creat a flat planet instead of a sephere?

[JL13sky]

Dear sir,i want to creat a earth on a flat planet ,not on a sephere.I watched your video， the Sahara Eye in your video also mentions how to do it, but I don't find it in your code. It seems to be the script "heightmapvis.cs". Hope to hear from you, thank you！