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MaxtoA: Arnold Subdivision Pinching

5 REPLIES 5
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Message 1 of 6
eduardo.ramirez
457 Views, 5 Replies

MaxtoA: Arnold Subdivision Pinching

HI Everyone, I hope you guys are doing Ok.

I was doing some testing with subdivision on a learning scene, And I've not been able to correct the subdivision using the catmull-clark algorith that comes with the renderer.

I would like to use that one in part because it seems to be a lot faster than opensubdiv that comes with 3dstudio Max.

I was wondering if somebody could advise me on what might Ive been missing.

This is the desired result: Using OpenSubdiv Modifier

2298-opensubdiv.png

But when disable the opensubdiv modifier and enable the Catmull-clark for the objects, Im getting this results:

2299-arnoldcatclark.png

As you can see there is some pinching on the edges.

I try modifing the creases, but I didnt seem to do much, The object is all quad and it subdivides well with opensubdiv modifier.

I hope someone could advice me.

Im using 3dsmax 2019.1 and Arnold 5.2.0.0 (2.1.945.0)

Thanks a lot.

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5 REPLIES 5
Message 2 of 6
RGhost77
in reply to: eduardo.ramirez

This is known limitation,which still don't fixed.

Check this thread:

https://forums.autodesk.com/t5/3ds-max-shading-lighting-and/arnold-for-max-update/m-p/8224594

For now, I recommend do not use Arnold subdivs. You can use Opensubdiv modifier instead.


Royal Ghost | veda3d.com
Message 3 of 6

Dang!! It´s been around more than a Year!!!!! 😞

Maybe I should start to learning Maya ASAP, (Hopefully wont be abandoned, as it runs on Linux and major studios still use it for that reason. A Lot more stable OS)

Its seems unlike it to be fixed soon. 2019 came and the problem is still there.

Thanks for your comments.

Message 4 of 6

We just released MAXtoA-2.3.33 , that exports shapes with subdivision/displacement to quads instead of triangles, fixing the reported problem.
See the doc page for details

Message 5 of 6
simon
in reply to: eduardo.ramirez

Hi everyone,

I have a similar problem using the Subdivision option of the "Arnold properties modifier" in 3ds max 2019.3 Update (MAXtoA 2.3.33). Perhaps it´s a bug with refractions?
Did you try to use other materials (no glass)?

I try to use Displacement (by map) and Subdivision on a bottle.
As you can see, the bottle rendered in blue looks ok but rendered with glass material it shows ugly distortions. Tried all the different settings for Type (Linear, Catmull-Clark) and UV Smoothing etc.

But even when I use OpenSubDiv or TurboSmooth instead of Arnold Subdivision there are distortions!

Message 6 of 6
Stephen.Blair
in reply to: simon

Please ask a new question. This question was about MAXtoA getting triangles, not quads, from 3ds Max, which caused subdivision problems. If you're using 2.3.33, then this isn't the same issue.



// Stephen Blair
// Arnold Renderer Support

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