Planes displaying strange patterns

[boundary]

I am trying to build a white model - done this many times in SketchUp but first time in Rhino - first renders are showing strange patterns on some surfaces - does anyone know how to deal with this ? getting close to starting over in SketchUp. any help would be much appreciated

[boundary]

Ok so its only happening with RTX on not with CPU - things getting weirder!

[natalia.gruzdova]

Hello boundary,

Could you please share the scene so we could take a look? You can send it either by attaching it to your answer on forum or by opening a ticket.

Also please share which version of V-Ray you are currently using, a screenshot of the About V-Ray would be sufficient.