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Rendering with Arnold in Houdini and Solaris using the HtoA plug-in.
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Solaris - dark edges on un-subdivided geometry

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Message 1 of 3
am_wilkins
170 Views, 2 Replies

Solaris - dark edges on un-subdivided geometry

Good day,

 

We've been having an issue with Arnold and Solaris which is causing "black edges" that look almost like "toon shader" _(but it's not a toon shader)_ edges on geometry that has no subdivisions/subdiv type (Linear/None).

 

In this example below, there is no render layers/passes etc. It's just the "beauty" render containing all the elements together. The issue happens within Houdini Hydra viewport and also rendering out an EXR.

 

This is a standard surface shader with nothing fancy, just Base and Specular.

 

01.jpg

 

We've tried all sorts of combinations to try and remove them:
• Normal Smoothing On and Off

• Subdiv Type: Linear and additional subdiv iterations


We don't want to do any catclark subdivisions, since the style is low poly.

Catclark however does solve the issue.

 

Additionally, adding the Houdini facet node with 'Cusp Polygons' enabled in a sopmodify resolves the issue, but we are not able to set this as a blanket option across all objects.
Nor this shouldn't be necessary...

 

We haven't noticed this issue with other render engines.

 

Any ideas what could be causing this?

 

 

All the best,

Amwilkins

--

Houdini Core Version 19.5.569
Arnold Core: 7.2.1.1

HotA: 6.2.1.1

CPU: AMD Ryzen TR 3990x

RAM: 128GB
GPU: NVIDIA RTX A4000
OS: Windows

2 REPLIES 2
Message 2 of 3
lee_griggs
in reply to: am_wilkins

Are the normals pointing outward? Can you upload a piece of geo that has this issue?

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 3 of 3
am_wilkins
in reply to: lee_griggs

Hello,

 

Thanks for the quick reply!

 

It appears like we've found the problem and it's on our end.

 

Although it appeared like the normals were fine in SOP level etc. the normal information was being removed from the USD prim in our asset setup. Preventing that from happening has solved the problem!

 

Will shout if anything funky related to this happens again, but otherwise calling this solved. :white_heavy_check_mark:

 


All the best,

Amwilkins

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