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Bump map artefacts
Posted: Tue Jun 09, 2020 7:59 pm
by Igor_K
hi Paul , All,
I have noticed sometimes I have artefacts on Bump map. See render below:
You can see (depending on camera angle) that there are some shading/lighting artefacts (edges marked with green).
If we compare to the Polysurface, you can see that artefacts appear directly along surface edges:
BTW, surface was created with TSplines for Rhino5. Is this the core of the problem, maybe??
So, why those artefacts appear?? Is it related in any way to "Shadow terminator" issue ?? or something else??
Attaching Rhino6 file:
Thanks,
Igor
Re: Bump map artefacts
Posted: Tue Jun 09, 2020 11:03 pm
by face_off
What version of the plugin are you using please?
Paul
Re: Bump map artefacts
Posted: Wed Jun 10, 2020 12:41 am
by Igor_K
Paul, I'm using Octane version: 2020.1.0.121 - Enterprise
Re: Bump map artefacts
Posted: Wed Jun 10, 2020 7:27 am
by whersmy
Might be a scene scale issue? Can you check the rayepsilon slider in Kernel?
Re: Bump map artefacts
Posted: Wed Jun 10, 2020 12:12 pm
by face_off
I didn't get any artifacts when I rendered your scene. I could be a shadow from your environment map.
Paul
Re: Bump map artefacts
Posted: Wed Jun 10, 2020 12:54 pm
by Igor_K
Might be a scene scale issue? Can you check the rayepsilon slider in Kernel?
I tried to adjsut Ray Epsilon slider - no effect on the result, still seeing artifacts.
I didn't get any artifacts when I rendered your scene. I could be a shadow from your environment map.
I've tried with multiple different HDRi . With some of them its less visible (but still present).
Any other guesses?
Re: Bump map artefacts
Posted: Wed Jun 10, 2020 3:48 pm
by whersmy
Can you export an .orbx?
Maybe try a 32-bit image? With displacement it can make a difference.
Also the Uv`s are proper, right?
Re: Bump map artefacts
Posted: Wed Jun 10, 2020 6:25 pm
by Igor_K
whersmy
orbx attached
I'm using tri-planar mapping here and Octane noise texture for bump.
Re: Bump map artefacts
Posted: Thu Jun 11, 2020 7:12 am
by whersmy
Looked it into it, and yes, it is weird. It becomes way better visible when using a really small scale noise texture. When using a larger scale (though probably not the user-case) it`s not visible.
I never really had this issue before
Re: Bump map artefacts
Posted: Thu Jun 11, 2020 3:35 pm
by Igor_K
whersmy
Thanks for checking!
Paul, maybe you can share .orbx file with Octane dev team to investigate?? I still not entirely sure whether its Octane issue or geometry issue (like I mentioned, geometry created with tSplines for Rhino5 and its not very "clean" CAD surfacing, more like a " quick concept" quality), so maybe its issue of bad geometry. I just want to know whats casing the issue and how to avoid it in the future.
Thanks.