Weird pattern - opacity map on simple planes when viewed behind eachother

[tom182]

Hi
My scene is simple planes with texture map and opacity map applied to give effect of a powder coated steel mesh paneling (footbridge over a railway line) looks fine in material editor but when rendered from a view where one  panel is behind the other I am getting a weird pattern - actually it looks like the texture/opacity map only a lot bigger. only happens when viewing one panel behind another. The attached image will illustrate this.
any ideas as to what is causing this?
thanks
Tom

[Njen]

It is the Moiré effect, looks perfectly normal to me. It can be combatted a little with more samples.

[Nekrobul]

1 - try to increase image resolution

2 - wait for more pases to be done

3 - might want to decrease GI/AA balance to something like 8-4

4 - DoF might help too if thise panels are used in long range

If the effect still be there than it should be so? =D

[tom182]

this is where I show my newbieness with Corona (swapped over from VRay)
I am using PT+PT
Increased Render size from 1600*1068 to 3000*2002
Upped Pass Limit from 100 to 300
samples: GI vs. AA balance = 16, light samples multip = 4
does the above look OK?
I think i am coming around to the idea that it is correct due to Moire
thanks,

[pokoy]

Crazy - I've seen exactly this effect on a bridge I used to pass when on my daily commute and wondered if it would be reproducible in CG. Turns out it works, what you see here happens in real life, too.

[romullus]

Rendering for more passes or more samples probably won't help much, if at all. Rendering to as high resolution as your RAM permits and then downscaling, should help significantly.

[maru]

samples: GI vs. AA balance = 16, light samples multip = 4

I'd advise to revert to defaults (16/2).
https://coronarenderer.freshdesk.com/support/solutions/articles/5000515640

Lowering GIvsAA may actually make some sense as you will get nicer AA faster, at some cost of GI quality.