I have a problem. I did some renderings and unfortunately I had these vertical black stripes on my facade. Is there someone who can help me? I was just in the twilight zone. It’s not a texture issue because it’s just a color.
Halo,
What is your modelling software? Is your model far from the origin in the modelling software or in D5?
If you move the model closer to the origin, the issue should be resolved. 
Thank you, I’ll try 