I have been able so far to create a star system containing a homestar, homeworld, 1 uncolonized planet. I mixed and matched some of the continent graphics for a unique homeworld appearance. Now the only way I have gotten it to work as a selectable starting system is to add in the custom system info into starsystemdefs and use the replace method in my my docs mod folder. If i try to use the add method by adding a suffix to starsystemdefs containing only the custom system info i get CTD.
So is StarSystemDefs locked or hardcoded to where the add method will not function, and if so are there other xml's that are similar?
Question, did you one, create a custom ContinentDefs xml and two did you place your heightmap in the Custom Heightmaps folder in the game's main gfx folder? If not than there's your problem. The heightmap must go into the main Custom Heightmaps folder for the game, not one in the mods folders, otherwise it will CTD. You may also find answers in the falling thread.
https://forums.galciv3.com/466441/page/1/#3557864
