Hello all,
what happens if I reduce the roughness value (limit with direct entry is 0,001) with the help of an value node?
Is it possible to reach lower roughness values with this trick?
Thank you.
BR
Reducing roughness by value
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Please upload a testscene that allows developers to reproduce the problem, and attach some images.
Please upload a testscene that allows developers to reproduce the problem, and attach some images.
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- Posts: 234
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Reducing roughness by value
OS - Windows 7 X64
CPU - Intel CORE i7
GPU1 - Variants of notebook card from nVidia
GPU2 - Variants of notebook onboard card from Intel
Lux - Latest possible relaease
CPU - Intel CORE i7
GPU1 - Variants of notebook card from nVidia
GPU2 - Variants of notebook onboard card from Intel
Lux - Latest possible relaease
Re: Reducing roughness by value
It is limited by the code to 1e-9: https://github.com/LuxCoreRender/LuxCor ... y2.cpp#L76lighting_freak wrote: ↑Thu Jun 25, 2020 9:24 am Is it possible to reach lower roughness values with this trick?
You can export the scene in text format to check how your node setup is exported.
Re: Reducing roughness by value
Yes, i use all the time 0.00000001 for glass with BiDirVM + Sun or Sun on HDRmap.
The BiDirVM renders sun black with clear glass.
The BiDirVM renders sun black with clear glass.
Re: Reducing roughness by value
Should I use 1e-9 in the Blender addon as well?
Re: Reducing roughness by value
I don't think so, 1e-9 is a limit coming from old Lux and it is too small: if you check few line after, there is a square of the number (and than a division too) and it is very likely to end as a 0 with FP32. Using so small numbers is asking for troubles.
Re: Reducing roughness by value
1e-8 is lowest that has worked for me.
Are there any other FP32 limitations for volume absorption in small scale rendering, like jewelry?
Like say a gemstone 2mm in size, sometimes you change transmission 2.5 times lower, but it goes from full transparent to pure black?
Are there any other FP32 limitations for volume absorption in small scale rendering, like jewelry?
Like say a gemstone 2mm in size, sometimes you change transmission 2.5 times lower, but it goes from full transparent to pure black?
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- Posts: 234
- Joined: Thu Jan 18, 2018 6:02 pm
Re: Reducing roughness by value
Hi,
Thanks for your help.
This one is a good question too.
I had some troubles in the past as well:
Thanks for your help.
This one is a good question too.
I had some troubles in the past as well:
BR
OS - Windows 7 X64
CPU - Intel CORE i7
GPU1 - Variants of notebook card from nVidia
GPU2 - Variants of notebook onboard card from Intel
Lux - Latest possible relaease
CPU - Intel CORE i7
GPU1 - Variants of notebook card from nVidia
GPU2 - Variants of notebook onboard card from Intel
Lux - Latest possible relaease