Okay, I think I know what is the issue here.
If you want to apply the material to area of polygons, you first need to apply a base material to the entire model and not just the group.
You can see that I have material 1 as a base color and material 2 for the selected group of polygons.

Before that ...

Hi aoktar, yes I have. The standard and the physical.
The problem ONLY forms when using Octane.

Hi everyone,

I'm having a bit strange problem. I'm using Cinema cloner and the Plain MoGraph Effect to animate some segments appear and disappear.
At the beginning of the animation, the cylinders that I'm using for the animation are at the hight 0.00cm and they are slowly growing to their full ...