Default Clamp value #62691

New Issue

Marco · 2019-03-17T21:05:09+01:00

Marco commented

2019-03-17 21:05:09 +01:00

System Information
Operating system: Ubuntu 18.04 64bit
Graphics card: AMD RX 580 (8GB)

Blender Version
Broken: 2.80.49, cc5bdf0293, 2019-03-16

Short description of error

This is not a bug, I would like to have the Clamp Indirect value in Cycles to be 0 instead of 10.
In 2.8 the default value is 10, while in 2.7 it was 0.
Please can you make it 0 as i was getting 2 different results with the same project file (one saved in 2.7 and the other in 2.8) and i was't finding the issue.

**System Information** Operating system: Ubuntu 18.04 64bit Graphics card: AMD RX 580 (8GB) **Blender Version** Broken: 2.80.49, cc5bdf029324, 2019-03-16 **Short description of error** ![screenshot.png](https://archive.blender.org/developer/F6840174/screenshot.png) This is not a bug, I would like to have the Clamp Indirect value in Cycles to be 0 instead of 10. In 2.8 the default value is 10, while in 2.7 it was 0. Please can you make it 0 as i was getting 2 different results with the same project file (one saved in 2.7 and the other in 2.8) and i was't finding the issue.

Marco commented

2019-03-17 21:05:09 +01:00

Added subscriber: @nacioss

William Reynish commented

2019-03-17 21:12:26 +01:00

Added subscriber: @WilliamReynish

William Reynish commented

2019-03-17 21:12:26 +01:00

Changed status from 'Open' to: 'Archived'

William Reynish closed this issue

2019-03-17 21:12:26 +01:00

William Reynish self-assigned this 2019-03-17 21:12:26 +01:00

William Reynish commented

2019-03-17 21:12:26 +01:00

As you say yourself, this is not a bug, but different defaults.

Opening old files with certain clamp values should not, and does not change or override the clamp value. I just tested this, and it does not happen. If you experience this, it is a bug, but in your report it is not quite clear if you are having that particular issue or not.

As you say yourself, this is not a bug, but different defaults. Opening old files with certain clamp values should not, and does not change or override the clamp value. I just tested this, and it does not happen. If you experience this, it is a bug, but in your report it is not quite clear if you are having that particular issue or not.

Marco commented

2019-03-17 21:22:06 +01:00

Nono, the clamp value remained 0 from Blender 2.7.

So, i have an addon that generates skies, since i was getting, as you can see, darker results in Blender 2.8, then i wanted to find out why:
So the left window shows the generated sky in a new 2.8 project, the right window shows Blender 2.79 with the same values in the addon.
Then i started searching what was wrong, until i found that the clamp value of Blender 2.8 was 10 instead of 0.
I really think you should set it 0 as default for new users not getting into trouble like me.

Nono, the clamp value remained 0 from Blender 2.7. ![screen.jpg](https://archive.blender.org/developer/F6840240/screen.jpg) So, i have an addon that generates skies, since i was getting, as you can see, darker results in Blender 2.8, then i wanted to find out why: So the left window shows the generated sky in a new 2.8 project, the right window shows Blender 2.79 with the same values in the addon. Then i started searching what was wrong, until i found that the clamp value of Blender 2.8 was 10 instead of 0. I really think you should set it 0 as default for new users not getting into trouble like me.

William Reynish commented

2019-03-17 21:29:48 +01:00

Added subscriber: @brecht

William Reynish commented

2019-03-17 21:29:48 +01:00

@brecht: Thoughts on default clamp values?

Brecht Van Lommel commented

2019-03-17 23:10:09 +01:00

It was an intentional change, I don't think it's better overall to go back to 0.

D2769: Cycles: change defaults for filter glossy, clamp and branched path AA.

It was an intentional change, I don't think it's better overall to go back to 0. [D2769: Cycles: change defaults for filter glossy, clamp and branched path AA.](https://archive.blender.org/developer/D2769)

Brecht Van Lommel commented

2019-03-17 23:13:22 +01:00

Also, exposure -6.781 is a really extreme value, would not recommend to use that in practice.

Marco commented

2019-03-17 23:22:15 +01:00

Brecht, you wrote it, "in production files the clamp is enabled".
Most work i do is not for a short film, i do still images and having Clamp 0 is necessary. By the way, you said you set it to 10 because of noise, well i don't think it is the case since there is the Denoisier. And anyway having it set to 0 as default could prevent people with no experience to see weird results.

Brecht, you wrote it, "in production files the clamp is enabled". Most work i do is not for a short film, i do still images and having Clamp 0 is necessary. By the way, you said you set it to 10 because of noise, well i don't think it is the case since there is the Denoisier. And anyway having it set to 0 as default could prevent people with no experience to see weird results.

Marco commented

2019-03-17 23:24:45 +01:00

I have exposure -6.781 there because i'm dealing with real world Sun and Sky values such as 700 of strength for Sun and 60 for Sky. Since the measurement unit of the strength value is W/m2

Brecht Van Lommel commented

2019-03-17 23:32:22 +01:00

Also for still images do people overwhelmingly use clamping, and it's standard in other renderers to enable it by default.

Clamp still helps significantly even when using denoising.

If you're going to adjust exposure then you should simply adjust clamp accordingly too.

Also for still images do people overwhelmingly use clamping, and it's standard in other renderers to enable it by default. Clamp still helps significantly even when using denoising. If you're going to adjust exposure then you should simply adjust clamp accordingly too.

Marco commented

2019-03-19 00:52:13 +01:00

Then what about the caustics enabled by default?

Don't tell me they are enabled in the production files.
And i still don't agree to keep Clamp = 10

Then what about the caustics enabled by default? ![caustics.png](https://archive.blender.org/developer/F6846638/caustics.png) Don't tell me they are enabled in the production files. And i still don't agree to keep Clamp = 10

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Default Clamp value #62691