FAQ
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Q: How to make terrain flat?
A: Use only two settings from the Terrain tab: Crater Density % (set it to 0), and Height Multiplier % (I usually set it to 1). That will give you a completely flat map. I'd recommend setting height multiplier and the other one to at least 10% (play around to find a setting that suits you), otherwise, you won't have any hills to build a mine against. Also, you will see lots of rock props around that flat terrain. Once you build over them (you should be able to) they disappear.

Q: Nothing happens when I run the editor.
A: Make sure you have at least Java 8 installed on your system (download). If you do, right-click on the editor file (*.jar extension), select "Open With..." and select "Java Runtime SE".

Q: At what address on the hard drive should the user place the file "jPBCE-Planetbase-challenge-editor-1.*.jar"?
A: It should work from any location on the hard drive.

Q: To work with this program, the user first needs to install something other than Java8?
A: No. Java 8 is the only requirement as it is a standalone app. I chose JAVA so it the editor can be run on any OS.