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Rendering with Arnold in Houdini and Solaris using the HtoA plug-in.
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AA issue with toon shader (htoa)

6 REPLIES 6
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Message 1 of 7
alainh3d
332 Views, 6 Replies

AA issue with toon shader (htoa)

toon-test.jpg


I get different qualities of AA on the edges of my objects.

Is it possible to get clean edges everywhere?

Thanks a lot.

Alain

link to file: https://wetransfer.com/downloads/121b74ed87dbf6853c0815e89754372420220302121124/8ace6f22b8daacb817d0...

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6 REPLIES 6
Message 2 of 7
lee_griggs
in reply to: alainh3d

Why contour: 4? Try increasing Camera (AA) samples. What resolution?

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 3 of 7
alainh3d
in reply to: alainh3d

Hello Lee and thank you for your response.

So I put the contour filter back to default (2) and crancked up the AA samples to 12 + Max Cam AA to 20. Resolution is 2500 x 2500 pixels. But the result is the same... I still get jagged edges.

However, it might be a compositing issue... As I opened the exr in Photoshop.

I just did a test in Fusion and the result is much better. Not perfect but way better than Photoshop.

Any thoughts on this?

Regards,

Alain


Message 4 of 7
alainh3d
in reply to: alainh3d

Well I think I found the bug... I comped the 2 passes (toon outline + Beauty) wrongly...

When you see the result in HTOA Renderview, it's fine. but if you want the outline + the beauty pass, you need to render them out separetly.

And the issue I have is the Alpha being post-multiplied... I think.

In Fusion if I flatten the exr (no Alpha), I get the result but if I want to comp it separetly, then the same issue happens as in Photoshop. I hope this makes sense.

Could someone please tell me how I could comp the 2 passes in a correct way? Fusion and Photoshop?

I would appreciate!

Thanks a lot.

Alain

fusion-comp.jpg



Message 5 of 7
alainh3d
in reply to: alainh3d

Finally I found a way to comp it, both in Photoshop and Fusion...

So it was a compositing issue and not Arnold's.

Cheers.

Alain


Message 6 of 7
lee_griggs
in reply to: alainh3d

Great. How did you comp it in the end?
Lee Griggs
Arnold rendering specialist
AUTODESK
Message 7 of 7
alainh3d
in reply to: lee_griggs

Sorry Lee, I just saw your question today...

Here is the solution...

Cheers.

Alain

final_comp.jpg

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