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Rendering with Arnold in 3ds Max using the MaxtoA plug-in.
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[TOON SHADER] How to prevent arnold from drawing outlines on specular reflections ?

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Message 1 of 3
perat.sylvain
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[TOON SHADER] How to prevent arnold from drawing outlines on specular reflections ?

I made a simple scene just to try to understand and fix the problem : it's just a teapot and a directional light. I applied a toon shader on the teapot, set the treshold angle to 20, and plugged a ramp with 3 tones in the base tonemap attribute. Everthing is fine. Then, if i start to add a bit of specular, then arnold draw an outline of the reflections. How can i prevent that ? I tried unchecking shader difference in the edge detection tab, switching between the 3 normal type modes, pluging an ai_utility node in mask color, plugging a ramp in the specular tonemap ... nothing worked. Any ideas ? Because on some of the images on the toon documentation page, they managed to get some specular reflections without the outlines.

No specular :

1392-fine.jpg

Specular weight : 0.1 :

1393-wrong.jpg

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Message 2 of 3
lee_griggs
in reply to: perat.sylvain

Does increasing the angle_threshold reduce the effect?

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 3 of 3

It reduces it a bit, but even at 180 in angle treshold, some outlines remains on specular reflection :

Angle treshold : 180

1398-180angle.jpg

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