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vray issue with multiple layers of glass
show user profile  rob@dynamic
Hi,

I have been having this issue recently and its really bugging. No matter what I've tried i can't fix it.

When rendering with multiple layers of glass I keep getting artifacts in the glass (highlighted in red).

Tried everything to fix but no luck. I've tried whacking up render setting, increasing max depth (as high as 500)

Any ideas guys?


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read 1052 times
3/27/2015 12:15:59 PM (last edit: 3/27/2015 12:15:59 PM)
show user profile  herfst1
Tried increasing the subdivs for refraction? I'd knock them up to a minimum of 64 and see what happens.
read 1048 times
3/27/2015 12:32:00 PM (last edit: 3/27/2015 12:32:00 PM)
show user profile  mike_renouf
I agree with Herfst. Even with 1.0 refractive and reflective glossiness, it still bugs out on me sometimes if the subdivs are too low.




read 1035 times
3/27/2015 1:03:20 PM (last edit: 3/27/2015 1:03:20 PM)
show user profile  rob@dynamic
i've tried that. all the way up to 260 and still no improvement:-(


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read 1032 times
3/27/2015 1:04:58 PM (last edit: 3/27/2015 1:05:15 PM)
show user profile  herfst1
The easiest way to work out exactly what is going on is with render elements, check your reflection, refraction, shadows, total lighting etc. The noise will be on one of those passes.
read 1029 times
3/27/2015 1:27:48 PM (last edit: 3/27/2015 1:27:48 PM)
show user profile  BishBashRoss
No prizes for guessing which one in this case though.

Edit.

What is that darker area there? difficult to tell exactly what I'm looking at in that area.





read 1024 times
3/27/2015 2:03:06 PM (last edit: 3/27/2015 2:06:22 PM)
show user profile  herfst1
Yep, got my money on reflections (didn't see they were set to 8 subdivs before).
read 1021 times
3/27/2015 2:06:49 PM (last edit: 3/27/2015 2:06:49 PM)
show user profile  BishBashRoss
8 is fine as glossiness is set to 1 I reckon. Why no fresnel reflections tho?

Wondering why IOR is set so low, is that something you arch vis peeps do?





read 1020 times
3/27/2015 2:16:06 PM (last edit: 3/27/2015 2:16:06 PM)
show user profile  herfst1
Interesting. Could you explain why 100% glossiness requires less subdivs?
read 1013 times
3/27/2015 2:26:39 PM (last edit: 3/27/2015 2:26:39 PM)
show user profile  BishBashRoss
It makes sense if you think about it it from a path tracing point of view. Imagine a ray sent from the camera to a surface, bouncing off and then hitting another. the more blurred the reflections the more rays you need to send out per pixel because they are reflecting a larger area.

That's how I understand it anyway.


Rob, have you tried using a more standard glass material to see if that helps?








read 1010 times
3/27/2015 2:36:36 PM (last edit: 3/27/2015 2:36:36 PM)
show user profile  herfst1
Ah, I get it. Yeah, that makes sense. Good to know. Will help make my initial sub-div estimates closer to the optimised amount. Cheers.
read 1004 times
3/27/2015 2:50:36 PM (last edit: 3/27/2015 2:50:36 PM)
show user profile  Error404
Also try lowering the cutoff threshold on the reflection and refraction as well, the dimmer the reflactions get, the lower the cutoff threshold will need to be.

www.DanielBuck.net - www.DNSFail.com

read 997 times
3/27/2015 3:55:08 PM (last edit: 3/27/2015 3:56:40 PM)
show user profile  rob@dynamic
thanks for all the comments guys.

So i'm making progress...

I've increased the Max Transp. Levels which has got red of the black artifacts, now just the white ones to figure out:-(


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read 986 times
3/27/2015 4:39:21 PM (last edit: 3/27/2015 4:39:21 PM)
show user profile  rob@dynamic
also,.

Switching from adaptive subdiv to adaptive fixes it completely...

Why is this?


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read 980 times
3/27/2015 4:44:58 PM (last edit: 3/27/2015 4:44:58 PM)
show user profile  donvella
use chamfer boxes for glass panes, or just chamefer those edges should fix the white line.

adaptive is good for reducing noise in large areas like ceilings,planes etc. adaptive takes a bit of playing with the settings to reduce noise, adjusting subdivs of lights, render settings, materials etc (preferred method, more control and faster render...). If you want a quick fix you could just change the color threshold in the AA settings to .005 (and leave ur noise at default 0.1 in system settings).




read 949 times
3/28/2015 7:41:53 AM (last edit: 3/28/2015 7:43:14 AM)
 
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