Author Topic: Noise pattern: bug or... -- (scene included) --  (Read 12454 times)

2014-08-05, 17:46:55
Reply #15

higgledyhiggles

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2014-08-05, 19:46:13
Reply #16

maru

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I can see there are some little errors in this scene like doubled vertices near window holes but I don't know if they are affecting performance. This is a pretty hard lighting situation and there are reflective materials everywhere, this must be the case. Would it render any faster in some other renderer?
Marcin Miodek | chaos-corona.com
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2014-08-05, 21:03:38
Reply #17

cecofuli

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Ok, I didn't see that. Yes, not easy scene, but I found the same noise pattern problem in all my scene with white wall.
Also, I found other three different annoying situations, impossible to solve with Corona:

(*) In an room (SPA), after one hour, everything was almost enough, but a glossy surface on a vase was very noisy and, the noise pattern, was incredibly visible (Corona needs an adaptation options or some improvement to solve the noise pattern flickering)
(*) In a room, with a lot of bottle, the flickering on the glass, due lights reflection, was impressive. As other user wrote, like in this thread or in this thread, the "solution" (not real solution, because impossible to remove, right now) was to change the glass glossy from 1 to 0.95 or 0.9. Also, I changed the Rays from 25 to 12. But, again, after one hour for frame, the flickering was still there.
(*) White walls, close to a lights (as a led stripe) very noisy (the noise patter is very vibrant) in animation. If I level up a LSM sample to 16 i cannot resolve the problem.

I tryed to remove this in AE, vith a denoise plugin. 

As you can see in my frame, there are a crazy noise patter mutation every frame and the bright pixel mutation  on the reflection/refraction produced by the lights.
« Last Edit: 2014-08-05, 21:29:19 by cecofuli »

2014-08-06, 18:12:35
Reply #18

cecofuli

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Ok, finally I can show you how "dirty"is the noise patter calculation, in Corona.



VIDEO DOWNLOAD

(*) On the left side, the pattern correction
(*) On the right side, the original RAW animation


What I did, in After Affect with a noise reduction plugin, is  to stabilized the noise.
Look carefully! Inside the plugin, I didn't touch any noise reduction parameter (in fact it's zero).
The plugin compares the 3th frames before and after the frame analyzed. Next, it attempts to stabilize the noise pattern.
Maybe a little bit of noise reduction. I don't know exactly how it works behind the hood ^__^
I think Corona need something like that. This isn't a real noise reduction. It's called "noise stabilization".
Maybe, the algorithm behind "Time dependent" VRay option does this task. I don't know.


« Last Edit: 2014-08-08, 14:51:34 by cecofuli »

2014-09-01, 11:23:20
Reply #19

cecofuli

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2014-09-01, 11:53:51
Reply #20

Ondra

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unfortunately not. I will probably get to it in a debugging session before commercial version launch
Rendering is magic.How to get minidumps for crashed/frozen 3ds Max | Sorry for short replies, brief responses = more time to develop Corona ;)

2014-09-01, 11:59:46
Reply #21

cecofuli

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Augh =(  ok!
I understand. In the meantime, I'll work with denoise in post. Thanks! ;-)

2014-12-08, 22:12:22
Reply #22

Ondra

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Implemented/Fixed
Rendering is magic.How to get minidumps for crashed/frozen 3ds Max | Sorry for short replies, brief responses = more time to develop Corona ;)