Cauchy B Coeff might produce wrong results?
- Silverwing
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Cauchy B Coeff might produce wrong results?
Hi there,
I just rendered my glass scene again over night (17h) with a little dispersion.
However the Result is not giving me what I have expected.
Render algorithm was MLT-BiDir but it looks the same in Pathtracing-BiDir.
The Renderer was Indigo fo Cinema 4D 3.8.26.2
Cauchy B Coeff was 0.005
Here is the original render. Same Material but without the Cauchy B Coeff
It looks more natural (is not brighter then the background).
Also notice the silhouette of the glass thickens inside the glass is much more pronounced with the Cauchy B material.
Cheers,
Raphael
I just rendered my glass scene again over night (17h) with a little dispersion.
However the Result is not giving me what I have expected.
Render algorithm was MLT-BiDir but it looks the same in Pathtracing-BiDir.
The Renderer was Indigo fo Cinema 4D 3.8.26.2
Cauchy B Coeff was 0.005
Here is the original render. Same Material but without the Cauchy B Coeff
It looks more natural (is not brighter then the background).
Also notice the silhouette of the glass thickens inside the glass is much more pronounced with the Cauchy B material.
Cheers,
Raphael
Last edited by Silverwing on Mon Nov 16, 2015 4:31 am, edited 1 time in total.
You don´t dream in cryo.
- zeitmeister
- Posts: 2010
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Re: Cauchy B Coeff might broduce wrong results?
This is strange and definately shouldn't look that way. Did you check your scene scale?
Cheers, zeiti
Cheers, zeiti
Cheers, David
DAVIDGUDELIUS // 3D.PORTFOLIO
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Indigo 4.4.15 | Indigo for C4D 4.4.13.1 | C4D R23 | Mac OS X 10.13.6 | Windows 10 Professional x64
DAVIDGUDELIUS // 3D.PORTFOLIO
·
Indigo 4.4.15 | Indigo for C4D 4.4.13.1 | C4D R23 | Mac OS X 10.13.6 | Windows 10 Professional x64
Re: Cauchy B Coeff might broduce wrong results?
Hi
The scene was lit by an environment map?
The scene was lit by an environment map?
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- Silverwing
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Re: Cauchy B Coeff might broduce wrong results?
The Scene scale should match real world. I´m not sure if it fits exactly because I do not know exactly what scale is exported by cindigo. But at least in C4D everything is in scale.zeitmeister wrote:This is strange and definately shouldn't look that way. Did you check your scene scale?
Cheers, zeiti
Yes the scene is lit entirely by a HDRI 360° map.zeitmeister wrote:This is strange and definately shouldn't look that way. Did you check your scene scale?
Cheers, zeiti
I should mention that this is the result of a linear output. (Untonemapped EXR)
It looks perfect with Cauchy B set to 0.
Cheers,
Raphael
You don´t dream in cryo.
- thesquirell
- Posts: 428
- Joined: Fri Aug 29, 2014 3:49 am
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Re: Cauchy B Coeff might broduce wrong results?
Dear Raphael,
Cindigo will export in scale which is chosen in Render Setting, Enviroment, Scene scale. I think it just takes the numbers from the scene and it just takes them as they are, without conversion. But I am not sure about that. To avoid all the confusion about the scale etc. I make sure my project settings say the same scene scale as Scene scale in cindigo's render setting, which is the same as unit display in C4D's preferences. Play safe!
Would love to hear how this develops. Never had any problem with CBC before.
Cindigo will export in scale which is chosen in Render Setting, Enviroment, Scene scale. I think it just takes the numbers from the scene and it just takes them as they are, without conversion. But I am not sure about that. To avoid all the confusion about the scale etc. I make sure my project settings say the same scene scale as Scene scale in cindigo's render setting, which is the same as unit display in C4D's preferences. Play safe!
Would love to hear how this develops. Never had any problem with CBC before.
- zeitmeister
- Posts: 2010
- Joined: Tue Apr 22, 2008 4:11 am
- Location: Limburg/Lahn, Germany
- Contact:
Re: Cauchy B Coeff might broduce wrong results?
What Happens if you use the cindigo version before? And does it come correctly of you use a coefficient of 0.001?
Cheers, zeiti
Cheers, zeiti
Cheers, David
DAVIDGUDELIUS // 3D.PORTFOLIO
·
Indigo 4.4.15 | Indigo for C4D 4.4.13.1 | C4D R23 | Mac OS X 10.13.6 | Windows 10 Professional x64
DAVIDGUDELIUS // 3D.PORTFOLIO
·
Indigo 4.4.15 | Indigo for C4D 4.4.13.1 | C4D R23 | Mac OS X 10.13.6 | Windows 10 Professional x64
- Oscar J
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Re: Cauchy B Coeff might broduce wrong results?
Oh my. Though Indigo at least had its basics right.
Re: Cauchy B Coeff might broduce wrong results?
Hi, send over the scene, I'll take a look (eventually).
- Silverwing
- Posts: 71
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Re: Cauchy B Coeff might produce wrong results?
Yes that´s what I have been doing too. I checked the scene scale with the apperture. Whrong translations end up with the wrong DOF. So if the DOF is way to strong or not there with a Apperture 3.5 you know there is something off the scale.thesquirell wrote:Dear Raphael,
Cindigo will export in scale which is chosen in Render Setting, Enviroment, Scene scale. I think it just takes the numbers from the scene and it just takes them as they are, without conversion. But I am not sure about that. To avoid all the confusion about the scale etc. I make sure my project settings say the same scene scale as Scene scale in cindigo's render setting, which is the same as unit display in C4D's preferences. Play safe!
Would love to hear how this develops. Never had any problem with CBC before.
I have set the Scale to mm within C4D and within the Exporter.
I changed it to cm and to m just to see if it makes a difference. But unfortunately it does not. Cauchy B always has that magenta tint.
No I have not checked yet. Maybe I should.zeitmeister wrote:What Happens if you use the cindigo version before? And does it come correctly of you use a coefficient of 0.001?
Cheers, zeiti
I have instead exported it to the latest Indigo standalone v3.8.29
I added some pictures:
I will upload the scene later.
Cheers,
Raphael
You don´t dream in cryo.
- Silverwing
- Posts: 71
- Joined: Sun Aug 23, 2015 1:16 am
- Location: Ludwigsburg Germany
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Re: Cauchy B Coeff might produce wrong results?
As Promised here´s the scene.
I hope this *.pigs file works!
If not just write me a line!
GLASS-SCENE
Cheers,
Raphael
I hope this *.pigs file works!
If not just write me a line!
GLASS-SCENE
Cheers,
Raphael
You don´t dream in cryo.
Re: Cauchy B Coeff might produce wrong results?
Thank Sliverwing.
Looks like it's a problem with the combination of dispersion (single wavelength rendering), and non-post-process aperture diffraction.
Easy workaround - use post-process aperture diffraction only (or turn it off).
Looks like it's a problem with the combination of dispersion (single wavelength rendering), and non-post-process aperture diffraction.
Easy workaround - use post-process aperture diffraction only (or turn it off).
- Silverwing
- Posts: 71
- Joined: Sun Aug 23, 2015 1:16 am
- Location: Ludwigsburg Germany
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Re: Cauchy B Coeff might produce wrong results?
Oh such an easy fix. Thanks a lot for having a look at the scene!OnoSendai wrote:Thank Sliverwing.
Looks like it's a problem with the combination of dispersion (single wavelength rendering), and non-post-process aperture diffraction.
Easy workaround - use post-process aperture diffraction only (or turn it off).
Much appreciated!
Cheers,
Raphael
You don´t dream in cryo.
- Silverwing
- Posts: 71
- Joined: Sun Aug 23, 2015 1:16 am
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Re: Cauchy B Coeff might produce wrong results?
Sorry for being so picky.
Yes the Aperture Fix got rid of the coloring. But I still get this stange "Artifact" in the rendering with Chauchy B Coeff. The Silhouette of the glass gets much more pronounced (Marked Green). I think there is something off!
P.s. I used the old colored rendering for comparison. The test with the Aperture fix only gets rid of the color!
Cheers,
Raphael
Yes the Aperture Fix got rid of the coloring. But I still get this stange "Artifact" in the rendering with Chauchy B Coeff. The Silhouette of the glass gets much more pronounced (Marked Green). I think there is something off!
P.s. I used the old colored rendering for comparison. The test with the Aperture fix only gets rid of the color!
Cheers,
Raphael
You don´t dream in cryo.
Re: Cauchy B Coeff might produce wrong results?
That's no problem for being picky, good spotting
There's a known issue/limitation with the dispersion code that I should probably fix. It's to do with the computation of the fresnel reflection term and the actual (waveelength-dependent) IOR for the wavelength as opposed to the base wavelength.
There's a known issue/limitation with the dispersion code that I should probably fix. It's to do with the computation of the fresnel reflection term and the actual (waveelength-dependent) IOR for the wavelength as opposed to the base wavelength.
Re: Cauchy B Coeff might produce wrong results?
What if you increase cauchy B to a value such as 0.005?
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