Thank you for your answer!

Yes, you are right) text on the wall exists but they are under a black layer but without a little white background as on the sweethome3d editor.

check screenshot - link

but I think I need a programmer who has a lot of experience contributing to this application and maybe can make me a point about why it is as is.

what bout the code it is from my friend jar and I am gonna rename the variables. I am developing a very useful plugin for myself maybe for the public.