Author Topic: severe noise & fireflies on 360 spherical  (Read 3499 times)

2020-04-18, 12:34:38

JEK5019

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hello -

so i've been rendering this scene (4 cameras) for the last week - at varying times (9 hrs to 12 hrs each)

I've also been reviewing various posts on the corona forum and then attempt various adjustments on each new render - all off which have led to failure. 😒

anyway - I have officially surrendered and now seek the help from my fellow coronans.

the first 3 images are from 2 days ago - fairly clean but some noise and def some fireflies. I've been tooling with GIvsAA, light samples, etc.. none of which have worked for me.

on the following image - I had concluded that maybe it had to do with my window mats - where I decided to make them (thin) no refraction. but now heavy noise... 😢

I have included some snapshots of my render setup. also - at each window location - I am using a backplate (corona rayswitch) as you can see attached. the hdri is peter gutherie's (2003 dusk blue).

i would be more than happy to upload the file for those who would prefer to examine the scene. it's just under 400 megs zipped - fyi.

looking forward to solutions - all the best!

jón


« Last Edit: 2020-04-18, 12:39:24 by JEK5019 »

2020-04-18, 22:21:31
Reply #1

JEK5019

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okay -

so i discovered a part of the problem. which was caustics in glass materials.

i had used a grey material override in trying to discern my scene - but also allowing glass & light to be preserved.

i decided in haste to remove all caustics from my scene - as I've been needing to finish (4) 360 images since last week.

rendering a 360 tonight at about 9 hours - noise limit @ 5% - 8000 x 4000. will update tomorrow morning the results!

2020-04-19, 18:04:39
Reply #2

3dboomerang

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Hey,

That's your HDRI talking. Try lowering the MAX SAMPLE INTENSITY to 1 instead of 25 and see those points dissapear.. Certain areas might get a TAD darker, but honestly, it's not worth the headache. Solve it with lowering contrast and such in the tools on the VFB.

On the bright side, you can remove denoiser, it takes up space and time you need. And change the Image Filter to "High Quality" - Since this works really nice but doesn't work with a desnoiser in the game. So win/win.

Grts!

2020-04-19, 18:20:21
Reply #3

JEK5019

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hey thanks 3dboomerang. that sounds promising - i'll give it a shot and get back with thie results!

2020-04-19, 19:53:38
Reply #4

JEK5019

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ok wow! i'm only 40 min into the render and it's way cleaner - this cuts down my renders tremendously - & no fireflies - much thanks 3dboomerang!


2020-04-19, 19:57:27
Reply #5

PROH

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Hi. IIRC the High Quality image filter does NOT work well with 360* - because it makes visible seems. Therefore "Tent" should be used for 360* images.

But I might be wrong :)

Edit: found this thread https://forum.corona-renderer.com/index.php?topic=28887.msg168300#msg168300

2020-04-19, 19:59:51
Reply #6

3dboomerang

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Yes.. I think you are ... I'm using High quality filtering. Check this out:

https://kuula.co/share/79wgD

This is a 360 rendered from a WIP i'm doing... No seams?... Renderer in 360° Spherical mode. Easy peanuts?

Note:
The forum you're referring to is talking about cubemaps. That's like rendering an unfolded-dice object with 6 planes.
I'm referring to rendering in a 360° Spherical Pano. No seems here?

Grts
« Last Edit: 2020-04-20, 11:56:54 by 3dboomerang »

2020-04-19, 21:39:14
Reply #7

PROH

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Thanks for correcting me. Great news :)

2020-04-19, 21:56:19
Reply #8

JEK5019

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aside from removing the fireflies - it has also boosted renders by at least 85% - insane.

i was tackling this myself for 1.2 weeks - i wish i had visited the forums much earlier :D

hey 3dboomerang - i was checking out your kuula 360 - how are getting that bokeh lighting effect? if you don't mind mt asking.

2020-04-20, 00:02:12
Reply #9

3dboomerang

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hey 3dboomerang - i was checking out your kuula 360 - how are getting that bokeh lighting effect? if you don't mind mt asking.

That would be post-vfx you can apply when uploading a 360°-pano to Kuula. There's a few options like that. Not much, but it helps sometimes :)

Glad ur helped!

Grts

2020-04-20, 10:52:19
Reply #10

JEK5019

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good to know & thanks again. 👍👏

2020-04-21, 17:09:14
Reply #11

maru

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Hey,

That's your HDRI talking. Try lowering the MAX SAMPLE INTENSITY to 1 instead of 25 and see those points dissapear.. Certain areas might get a TAD darker, but honestly, it's not worth the headache. Solve it with lowering contrast and such in the tools on the VFB.

On the bright side, you can remove denoiser, it takes up space and time you need. And change the Image Filter to "High Quality" - Since this works really nice but doesn't work with a desnoiser in the game. So win/win.

Grts!

I wouldn't recommend this. This way you kill most of the GI, especially if it's strong when using the default settings. It's not just "the image will be darker".
Looking OP's render settings, I would also recommend lowering Light Samples Multiplier. There is simply no need to boost it so high. It will only result in slower rendering without any visible benefit.

Generally, in cases like this, I would suggest:
- uploading the scene for us to check - https://corona-renderer.com/upload
- optionally - contacting support at https://coronarenderer.freshdesk.com/support/tickets/new (this guarantees faster feedback and more accurate diagnosis of the issue)

Marcin Miodek | chaos-corona.com
3D Support Team Lead - Corona | contact us

2020-04-21, 20:27:27
Reply #12

JEK5019

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thanks, maru -

it certainly achieved cutting down render times in some regard - but indeed, the GI is marginalized as a result.

I think it might be best to submit this through support - it would be helpful to sort this thoroughly so I don't encounter the problem again in the future.

all the best!

2020-04-22, 09:18:49
Reply #13

3dboomerang

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Maru, is there any other way to get rid of excessive fireflies from an HDR lighting?

I understand this isn't ideal, but then again, what's our alternative when we see this in our scene?

2020-05-01, 14:49:29
Reply #14

JEK5019

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hello maru -

i was curious - as i had uploaded my scene about 2 weeks back to contact support via https://coronarenderer.freshdesk.com/support/tickets/new

how long does it usually take in getting feedback? i can only assume at this point that this is quite normal? 🤷‍♂️