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reading flm files

http://forums.luxcorerender.org/viewtopic.php?t=3299

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Re: reading flm files

Posted: Mon Mar 29, 2021 10:19 am
by bartek_zgo
I think I found something. Could you explain me what is the difference between 2 approaches?
In the scene I have to radiance groups.
In the first approach I define 2 image pipelines. In first one I enable radiance group 0 and disable 1. In second pipeline 0 is disabled 1 is enabled

Code: Select all

film.imagepipelines.1.0.type = "NOP"
film.imagepipelines.1.radiancescales.0.enabled = 1
film.imagepipelines.1.radiancescales.0.globalscale = 1
film.imagepipelines.1.radiancescales.0.rgbscale = 1 1 1
film.imagepipelines.1.radiancescales.1.enabled = 0
film.outputs.5.type = "RGB_IMAGEPIPELINE"
film.outputs.5.filename = "/home/node/matadorNode/tmp/0_FI_68803_271618_0000_multilight_0.exr"
film.outputs.5.index = 1
film.imagepipelines.2.0.type = "NOP"
film.imagepipelines.2.radiancescales.0.enabled = 0
film.imagepipelines.2.radiancescales.1.enabled = 1
film.imagepipelines.2.radiancescales.1.globalscale = 1
film.imagepipelines.2.radiancescales.1.rgbscale = 1 1 1
film.outputs.6.type = "RGB_IMAGEPIPELINE"
film.outputs.6.filename = "/home/node/matadorNode/tmp/0_FI_68803_271618_0000_multilight_1.exr"
In the second approach I save radiance groups directly:

Code: Select all

film.outputs.6.index = 2
film.outputs.7.type = "RADIANCE_GROUP"
film.outputs.7.filename = "/home/node/matadorNode/tmp/0_FI_68803_271618_0000_radiance_group_0.exr"
film.outputs.7.id = 0
film.outputs.8.type = "RADIANCE_GROUP"
film.outputs.8.filename = "/home/node/matadorNode/tmp/0_FI_68803_271618_0000_radiance_group_1.exr"
The images are different. I thought they will be identical. How can I convert images writen as output RADIANCE_GROUP to images saved by image pipelines?

Why I wan to do this? If I merge this 2 images written by image pipelines I get the same result as render output. If I merge 2 radiance groups, I get something different.

Re: reading flm files

Posted: Mon Mar 29, 2021 1:24 pm
by Dade
As I have already told you, indexes start from 0, not 1. You need to start from "film.imagepipelines.0", not "film.imagepipelines.1".

Re: reading flm files

Posted: Mon Mar 29, 2021 1:53 pm
by bartek_zgo
Dade, this is not an issue. I start form 0 but I didn't want to post everything:

Code: Select all

film.imagepipelines.0.0.type = "NOP"
film.imagepipelines.0.1.type = "INTEL_OIDN"
film.imagepipelines.0.2.type = "TONEMAP_LUXLINEAR"
film.imagepipelines.0.2.sensitivity = "100"
film.imagepipelines.0.2.exposure = 0.04
film.imagepipelines.0.2.fstop = 22
film.imagepipelines.0.3.type = "TONEMAP_LINEAR"
film.imagepipelines.0.3.scale = "0.39"
film.outputs.0.type = "RGB_IMAGEPIPELINE"
film.outputs.0.filename = "/home/node/matadorNode/tmp/0_FI_68803_271618_0000.exr"
film.outputs.0.index = 0
film.outputs.1.type = "MATERIAL_ID"
film.outputs.1.filename = "/home/node/matadorNode/tmp/0_FI_68803_271618_0000_idmaterial.png"
film.outputs.2.type = "OBJECT_ID"
film.outputs.2.filename = "/home/node/matadorNode/tmp/0_FI_68803_271618_0000_idobject.png"
film.outputs.3.type = "ALBEDO"
film.outputs.3.filename = "/home/node/matadorNode/tmp/0_FI_68803_271618_0000_albedo.exr"
film.outputs.4.type = "AVG_SHADING_NORMAL"
film.outputs.4.filename = "/home/node/matadorNode/tmp/0_FI_68803_271618_0000_avgShadingNormal.exr"
film.imagepipelines.1.0.type = "NOP"
film.imagepipelines.1.radiancescales.0.enabled = 1
film.imagepipelines.1.radiancescales.0.globalscale = 1
film.imagepipelines.1.radiancescales.0.rgbscale = 1 1 1
film.imagepipelines.1.radiancescales.1.enabled = 0
film.outputs.5.type = "RGB_IMAGEPIPELINE"
film.outputs.5.filename = "/home/node/matadorNode/tmp/0_FI_68803_271618_0000_multilight_0.exr"
film.outputs.5.index = 1
film.imagepipelines.2.0.type = "NOP"
film.imagepipelines.2.radiancescales.0.enabled = 0
film.imagepipelines.2.radiancescales.1.enabled = 1
film.imagepipelines.2.radiancescales.1.globalscale = 1
film.imagepipelines.2.radiancescales.1.rgbscale = 1 1 1
film.outputs.6.type = "RGB_IMAGEPIPELINE"
film.outputs.6.filename = "/home/node/matadorNode/tmp/0_FI_68803_271618_0000_multilight_1.exr"
film.outputs.6.index = 2
film.outputs.7.type = "RADIANCE_GROUP"
film.outputs.7.filename = "/home/node/matadorNode/tmp/0_FI_68803_271618_0000_radiance_group_0.exr"
film.outputs.7.id = 0
film.outputs.8.type = "RADIANCE_GROUP"
film.outputs.8.filename = "/home/node/matadorNode/tmp/0_FI_68803_271618_0000_radiance_group_1.exr"
film.outputs.8.id = 1

Re: reading flm files

Posted: Mon Mar 29, 2021 2:18 pm
by Dade
bartek_zgo wrote: ↑Mon Mar 29, 2021 1:53 pm Dade, this is not an issue. I start form 0 but I didn't want to post everything:
It is, you are not defining the radiance scales of image pipeline "0". You must.

Re: reading flm files

Posted: Tue Mar 30, 2021 6:11 am
by bartek_zgo
In the documentation it is written that it takes default value "1". I will prepare a zip with scene for you

Re: reading flm files

Posted: Tue Mar 30, 2021 7:03 am
by bartek_zgo
Here you can find my scene: https://files.fm/u/uaw4n44j8

I have noticed one issue that I'm currently investigating. This zip was created on linux, and rendered with luxcore 2.5rc1. And the result is strange. I thought that file multilight_0.exr will be identical to radiance_group_0.exr.

What is strange, on my windows machine I have luxcore_2.5alpha0 and the files looks almost identical! I will try to install latest version on my windows machine too.

Re: reading flm files

Posted: Tue Mar 30, 2021 7:43 am
by bartek_zgo
OK. Forget about difference between windows and linux. I think they are the same. I have vary powerful machine with linux and I render until 1024 spp, on windows machine I have a small laptop so I stopped render after 16 samples. So at the beginning multilight_*.exr == radiance_group_*.exr. More time the render takes, radiance_group_0.exr becomes more green, and radiance_group_1.exr becomes more cyan.
So I'm asking again. With my settings what is the difference between multilight_0.exr and radiance_group_0.exr. Should they be identical or not? If not, how to convert radiance_group_0.exr to multilight_0.exr?

Re: reading flm files

Posted: Tue Mar 30, 2021 7:53 am
by bartek_zgo
Here is a preview of files that I'm talking about. In previous post you can find link to zip that contains scene + exr files.
luxcore_multilight.PNG

Re: reading flm files

Posted: Tue Mar 30, 2021 9:45 am
by bartek_zgo
I found out, that I can save different image pipelines using film->SaveOutput and passing properties with index=X. That could solve my problem. But is it possible to give some names to this pipelines? I open flm file after merge. I found that there are 10 or 20 pipelines inside. Can I name them? Identifying by id is not very nice. Let say that during scene creation I add film.imagepipelines.1.name = "light_1". Can I read this information from flm file?
Still it wold be nice to understand why this images are different.

Re: reading flm files

Posted: Tue Mar 30, 2021 10:31 am
by Dade
bartek_zgo wrote: ↑Tue Mar 30, 2021 9:45 am Still it wold be nice to understand why this images are different.
I have told you why and how to fix the problem multiple times and you continue to do what you want so, I will do one last time than you are on your own.

Image pipeline names are tags (like textures, materials, etc.). Not numbers. The numbers are just a convention I used in my examples. So, for instance, "1" is different from "01" and "ABC" is a valid name.
However they are reference by position so, in the context of references, "0" is the first one defined (even if its tag name is "1").
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