Help with Understanding Displacement

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Help with Understanding Displacement

Postby RSgraphics » Sat Jun 23, 2018 8:01 pm

RSgraphics Sat Jun 23, 2018 8:01 pm
Hey everyone.

I have a project due Monday. Very simple scene (download attached). Its a parametric cube and I'm having the following issues:

1. Once I bevel the edges, the displacement map separates at the edges. I understand this is because I'm breaking the UV's once I bevel and tried using box mode but that just makes every side of the box have the displacement instead of just the front face. I've tried making the object editable and selecting just the front polygons but i still get the funky edges.

I'm hoping someone can download the scene and fix the Displacement to only show on one side and to have nice edges and also explain if my work flow is incorrect.. I uploaded my file and screen shots to help.

Thank you,
Robert.

OTOY HELP.zip
File for Review
(80.21 MiB) Downloaded 8 times
Last edited by RSgraphics on Sat Jun 23, 2018 8:05 pm, edited 1 time in total.
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Re: Help with Understanding Displacement

Postby RSgraphics » Sat Jun 23, 2018 8:02 pm

RSgraphics Sat Jun 23, 2018 8:02 pm
Here are the screen shots
Attachments
OTOY HELP DISP ON ALL SIDES.PNG
OTOY HELP BAD EDGES.PNG
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Re: Help with Understanding Displacement

Postby jayroth » Sat Jun 23, 2018 9:09 pm

jayroth Sat Jun 23, 2018 9:09 pm
Displacements in Octane can be a little tricky at times. In this case, the parametric cube is part of the problem, as the face vertexes of the cube are NOT welded together. You will need to convert your cube to an editable object, and optimize your points. This will weld the cube into a single cohesive object, which Octane will have better luck displacing. That said, there are still potential issues, to my recollection. You might need to adjust the displacement midpoint option to either 0 or 1 (defaults to 0.5). That should get you mostly there, but you may still have trouble. Searching the Cinema forums for displacement will get you more information.

Good luck!
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Re: Help with Understanding Displacement

Postby niestudio » Sat Jun 23, 2018 10:07 pm

niestudio Sat Jun 23, 2018 10:07 pm
try changing this displacement dropdown to follow geometric normal.
It closes the gaps here

closed_gaps.jpg
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Re: Help with Understanding Displacement

Postby RSgraphics » Sat Jun 23, 2018 11:10 pm

RSgraphics Sat Jun 23, 2018 11:10 pm
jayroth wrote:Displacements in Octane can be a little tricky at times. In this case, the parametric cube is part of the problem, as the face vertexes of the cube are NOT welded together. You will need to convert your cube to an editable object, and optimize your points. This will weld the cube into a single cohesive object, which Octane will have better luck displacing. That said, there are still potential issues, to my recollection. You might need to adjust the displacement midpoint option to either 0 or 1 (defaults to 0.5). That should get you mostly there, but you may still have trouble. Searching the Cinema forums for displacement will get you more information.

Good luck!



Yeah I tried all the usual settings. But this is beyond that. I tried with and without parametric objects and both had similar issues. The C4D cube is auto welded together by C4D. However a cylinder wont be auto welded as you described.
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Re: Help with Understanding Displacement

Postby RSgraphics » Sat Jun 23, 2018 11:11 pm

RSgraphics Sat Jun 23, 2018 11:11 pm
niestudio wrote:try changing this displacement dropdown to follow geometric normal.
It closes the gaps here

closed_gaps.jpg



Niestudio, which version are you running? Im using C4DR16 and octane 3.08. My version doesnt have that menu selection.
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Re: Help with Understanding Displacement

Postby niestudio » Sun Jun 24, 2018 12:08 am

niestudio Sun Jun 24, 2018 12:08 am
I'm on 3.08 too, but R17. Not sure if there's a difference from R16 to R17.
Can you post a screenshot of your displacement tab?
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Re: Help with Understanding Displacement

Postby RSgraphics » Sun Jun 24, 2018 1:04 am

RSgraphics Sun Jun 24, 2018 1:04 am
Here you go
Attachments
Displacement Tab.PNG
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Re: Help with Understanding Displacement

Postby niestudio » Sun Jun 24, 2018 1:10 am

niestudio Sun Jun 24, 2018 1:10 am
Perhaps you have an older release of 3.08
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Re: Help with Understanding Displacement

Postby RSgraphics » Sun Jun 24, 2018 1:17 am

RSgraphics Sun Jun 24, 2018 1:17 am
Oh i see. Its 3.06.

Im a little hesitent to upgrade. Dang maybe i should go for it.
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