PhotonGI cash problem

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PetrT
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PhotonGI cash problem

Post by PetrT » Fri Aug 27, 2021 12:50 pm

Hi
Have problem with PhotonGI cash
Why shading become broken?
Is it well known fact
PhotonPGI_CASH.png
with cash
NoCash.png
without cash

win 10
last build luxcore
Blender 2.93
Lightning
Env (Flat color)

Photon Cash params
007.png

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Dade
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Re: PhotonGI cash problem

Post by Dade » Fri Aug 27, 2021 2:56 pm

Can you post an as simple as possible test scene to reproduce the problem ?
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PetrT
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Re: PhotonGI cash problem

Post by PetrT » Fri Aug 27, 2021 5:34 pm

After unchecking Enviroment Cashe shading become normal

and when i try collect small of scene in new project
problem has gone even if Enviroment Cashe is on

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Dade
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Re: PhotonGI cash problem

Post by Dade » Sat Aug 28, 2021 12:14 am

There must be something in this particular scene triggering the problem, you could try to progressively remove stuff in order to isolate the source of the problem.
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PetrT
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Re: PhotonGI cash problem

Post by PetrT » Sat Aug 28, 2021 7:24 am


kintuX
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Re: PhotonGI cash problem

Post by kintuX » Sat Aug 28, 2021 7:24 pm

Use of PhotonGI Cache makes results a bit darker.
Not sure, but I think it was already mentioned...

0 - no caches (reference)
000_Caches_Off.jpg

1 - PGI (darker)
001_PGI.jpg
2 - PGI + ENV (darker)
002_pgi+env.jpg
3 - PGI+ENV+DLS (darker)
003_pgi+env+dls.jpg
4 - ENV (bright as reference w/o caches)
004_env.jpg

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Dade
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Re: PhotonGI cash problem

Post by Dade » Mon Aug 30, 2021 10:19 am

I'm looking in a Disney material related problem and I will check this as soon as I have finished there.

Have you tried to just disable PGI for the material of the bed ?
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kintuX
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Re: PhotonGI cash problem

Post by kintuX » Mon Aug 30, 2021 12:34 pm

Dade wrote:
Mon Aug 30, 2021 10:19 am
I'm looking in a Disney material related problem and I will check this as soon as I have finished there.

Have you tried to just disable PGI for the material of the bed ?
There's no Disney material used.
Bed & Pillows use Velvet, Walls - Matte, Floor & Structural framing - Glossy+Matte
Disabling PGI on a bed (Velvet) material helps a bit but not fully. And disabling it on Floor, slightly darkens a bit...
I'm thinking it might be Blender's "fix" for color values causing this by influencing Glossines Threshold... or it's just how this scene is set (I haven't gone through all details, since it's a bit of disorganized mess :roll:

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Sharlybg
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Re: PhotonGI cash problem

Post by Sharlybg » Mon Aug 30, 2021 1:30 pm

Have you tried to just disable PGI for the material of the bed ?
Just try what he is saying. It should work fine without speed penalty. Just disable Cache on the darkening material.
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Dade
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Re: PhotonGI cash problem

Post by Dade » Mon Aug 30, 2021 2:09 pm

kintuX wrote:
Mon Aug 30, 2021 12:34 pm
There's no Disney material used.
I mean I'm busy with a different topic and I will look into this one as soon as I have finished.
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