question about map moding

[SwordArTJBF]

Can I use heightmap data and the provinces BMP file from an EU4 mod with IR? If so, is there anything else I’d have to do to get the game to recognize the provinces? Or would it simply take the RGB colors from the .bmp file and attach them to vanilla province data?

 

[Jakov_Jijka]

Everything is a little more complicated, it compares the colors with the values from the defenition.csv file, and if there is no such color on province.bmp, the game just crashes.
heightmap does not crash, but most likely a couple of provinces will plunge under water