Arnold has some interesting terminology...not sure if its foul language but I 
kicked an ass file. However, it does not crash but it doesn’t render the 
highlights either.

Similar happened from within XSI and the render region...sometimes it will 
render when scrubbing in the timeline back to the original frame. Even when it 
renders, it doesn’t render the hilights.

With kick, it renders straight away but no hilights are rendered when MB is 
turned on.

 

Both XSI and kick give these error:
' ERROR : [arnold] [polymesh] : different number of motion keys in 
vertex/normal arrays: #normal keys: 1, #vertex keys: 2

' ERROR : [arnold] [polymesh] : different number of motion keys in 
vertex/normal arrays: #normal keys: 1, #vertex keys: 2

' ERROR : [arnold] [polymesh] : different number of motion keys in 
vertex/normal arrays: #normal keys: 1, #vertex keys: 2

 

What seemes like an issue with scene geometry isn’t actually related to a 
polymesh in the scene. It happens even if all geometry is deleted. Three errors 
with three lights in the scene....

I suspect it to be the arnold area lights itself. Maybe when arnold is building 
a geometry for the visible area lights to render them.

 

I might dig into that further and post it on the more appropriate channels 
regarding arnold. But so far it seems like an arnold issue.

 

Sven

 

From: [email protected] <[email protected]> On Behalf Of Sven 
Constable
Sent: Friday, August 11, 2023 12:02 AM
To: [email protected]
Subject: RE: SItoA/Arnold bug with motion blur and transmissive lights

 

Hi Stephen,

 

thanks for chiming in. I will try an ass export.

 

Sven

 

From: [email protected] <mailto:[email protected]>  
<[email protected] <mailto:[email protected]> > On Behalf Of 
Stephen Blair
Sent: Thursday, August 10, 2023 10:54 PM
To: [email protected] <mailto:[email protected]> 
Subject: Re: SItoA/Arnold bug with motion blur and transmissive lights

 

Hi Sven

 

I don't see any tickets for "quad light motion blur", so it's not a known issue.

 

If you could export an ass file and kick it, then it could be an Arnold bug. 
Except if there are a bunch of SItoA shaders in the scene...

 

Stephen

Arnold Renderer Support

 

On Thu, Aug 10, 2023 at 2:47 PM Sven Constable <[email protected] 
<mailto:[email protected]> > wrote:

Hi,

 

anybody still here? :)

 

Recently I was working on an old  test scene again to compare arnold and 
redshift (and even mr for a good amount of fun). Well, in that particular scene 
arnold crashes when using motion blur. I nailed it down to settings in the 
light shader (arnold quad light).

The values in the light shader for camera visibilty as well as transmission 
visibility are both zero by default. Maybe for a reason. Then it renders but 
changing them to any other value will crash arnold when using motion blur. 
Unfortunatly you would need transmission visibility for correct reflections in 
the glass.

Not sure if its an arnold or SItoA bug. I’m using SItoA 7.2.2.0.

 

I worked around it using grids for the transmissive highlights and switched off 
anything but the specular transmission for the grids. A bit awkward... that’s 
what I would expect from mental ray, not arnold. :(

Does anyone know if it’s a known bug, limitation or maybe something else?

 

You can see the issue here (the glass model has a 360 rotation over 50 frames)

www.imagefront.de/tmp/testscene_armadillo_comparison.jpg 
<http://www.imagefront.de/tmp/testscene_armadillo_comparison.jpg> 

 

Sven

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