Render result is lined

Can somebody tell me what causes this lined render result and how to fix it? Thanks!

Hi @Madis_Peterson , At first I thought that could be a planar mapping method set for the objects but the far wall doesn’t match what we see on the sides. I’m now thinking it’s shadows from the wavy slatted ceiling object. Post a 3dm or at least part that shows the issue if you need more help please.

It has something to do with the linear lights I think. 3dm model is here.

gym.3dm (11.2 MB)

gym_bj.3dm (11.1 MB)
I’d use rectangular or point lights depending on the look you prefer.