Per further research per Emmanuel:

> If you're able to run Sweet Home 3D from code source, simply change implementation of getBackgroundColor and getForegroundColor in PlanComponent class. Otherwise, this might be difficult.

ref: https://www.sweethome3d.com/support/for ... 4173AC2B00

Relevant ticket:
https://sourceforge.net/p/sweethome3d/f ... uests/824/