Spring RTS Engine

Where does bitmap1-bitmap5 and bitmapnuke point to? Where is it defined and can it be overwritten?

you mean e.g.
etc?

You'll want to look at

https://github.com/spring/spring/blob/m ... t.cpp#L768

and

https://github.com/spring/spring/blob/m ... B.cpp#L120

And your local script includes (exptype.h is the OTA one iirc).

Btw, I think BITMAP1 etc are ignored, but I may be mistaken.