Hello DIALux community,

I have a question regarding the 3D models that I import into DIALux. I am simplyfying my models on Rhino and save as 3ds file. I use those files in DIALux, I just drag and drop them into the model.

When I get a raytrace image, I sometimes have an issue on the surface of the imported model. It's like a black stain on them as you can see in the image below (On the table top and the library). How can I get rid of it?

Thank you in advance,