Nope. First thing I checked. CV counts at each vertex are 1. There is no 
non-manifold geometry that I can find related to the objects with the anomaly.

Besides, if it were the geometry, I would expect that removing the texture 
would not remove the anomaly. If there is no texture, the bug is not present.

Thanks


From: [email protected] 
[mailto:[email protected]] On Behalf Of Jordi Bares
Sent: Friday, June 01, 2018 9:36 AM
To: Official Softimage Users Mailing List. 
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 <[email protected]>
Subject: Re: A pain in the Arnold...

I would suggest you double check the geometry, is it possible you have double 
triangles?

jb

On 1 Jun 2018, at 14:32, Ponthieux, Joseph G. (LARC-E1A)[LITES II] 
<[email protected]<mailto:[email protected]>> wrote:

The original shader was a Lambert material with an image and a texture 
placement.

Replacing the shader elements with like for like makes no difference.

Replacing the file and Lambert nodes with aiImage and aiStandardSurface also 
made no difference.

I also replaced the SG and deleted the texture placement. No change.

Bummer. Thanks anyway!

joey

From: 
[email protected]<mailto:[email protected]>
 [mailto:[email protected]] On Behalf Of Ponthieux, 
Joseph G. (LARC-E1A)[LITES II]
Sent: Friday, June 01, 2018 9:06 AM
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Subject: RE: A pain in the Arnold...

No. In part because the scene has over 900 shaders. The thought of having to 
edit every one to make Arnold happy is not a pleasant one. I’ll look into 
though. Stay tuned. Thanks

Joey



From: 
[email protected]<mailto:[email protected]>
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Subject: Re: A pain in the Arnold...

Hmmm... have you tried rebuilding the shaders???

On Thu, May 31, 2018 at 2:14 PM, Ponthieux, Joseph G. (LARC-E1A)[LITES II] 
<[email protected]<mailto:[email protected]>> wrote:
Howdy yall,

I thought I would post here before I escalate this but… Arnold on Maya 2018 is 
producing an error in render…

I’ve got an ESRI City Engine scene imported into Maya 2018, It was working fine 
under Maya 2017 and rendering fine in Mental Ray. But mental Ray is gone now.


1.       It renders in the Maya Software render fine.

2.       In Arnold it produces what looks like triangulation (Tessellation) 
errors rendering some triangles darker than others.

3.       It only produces the problem on materials with texture maps.

4.       Disconnecting the textures from the diffuse color removes the problem. 
But removes the texture also. But this seems to indicate its not a lighting, 
normals, or shading error.

5.       I’ve turned literally everything in Arnold settings off or neutral and 
no change.

6.       Its not shadows, nor anti-aliasing, nor duplicate polygons, nor a bad 
mesh.

7.       Forcing a triangulate on the mesh can make different triangles darker 
but the problem does not go away.

8.       All reflections, shadows, motion blur, etc have been turned off in 
Maya and Arnold for Render Settings and Object. No change.

Any thoughts?

Thanks
Joey


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