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Rendering with Arnold in CINEMA 4D using the C4DtoA plug-in.
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Hello there, I'm new to Arnold render. I'm getting jagged areas through the transparency in my render. Any ideas on what could be causing it please? Example and settings attached. Thanks an advance.

7 REPLIES 7
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Message 1 of 8
lewis.curry
221 Views, 7 Replies

Hello there, I'm new to Arnold render. I'm getting jagged areas through the transparency in my render. Any ideas on what could be causing it please? Example and settings attached. Thanks an advance.

3351-screen-shot-2019-03-06-at-115218.png

3352-jagged.jpg

7 REPLIES 7
Message 2 of 8
lee_griggs
in reply to: lewis.curry

Those settings are ridiculously high. It looks more like a geo issue. What happens when you hide the front geo? Is it still there? Could it be coincidental geometry? Do you have Subdivision Iterations on any of them?

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 3 of 8
lewis.curry
in reply to: lewis.curry

Hi Lee. Thanks for reaching out. I'll double check that! It looked okay originally.
The renders will be used in hi res print. What settings would you recommend, whilst avoiding grain.

Message 4 of 8
lewis.curry
in reply to: lewis.curry

That seems to have been the issue @Lee Griggs
How embarrassing! Thanks for that.3359-screen-shot-2019-03-06-at-125927.png

Message 5 of 8
lee_griggs
in reply to: lewis.curry

Glad you fixed it. All of the 4's concern me. Especially for Diffuse Ray Depth. These will be very expensive to render. For a scene like this, I imagine 4 light samples would be enough and maybe you can drop the others.

What happens when you use the default settings with Camera (AA): 5 and 3 or 4 light samples?

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 6 of 8
lewis.curry
in reply to: lewis.curry

Thanks Lee. I've tried some lower settings. Halved the render time, but I have some black areas in the transparency.

3360-screen-shot-2019-03-06-at-160050.png

3361-screen-shot-2019-03-06-at-160205.png

Message 7 of 8
lee_griggs
in reply to: lewis.curry

Increasing Transmission Ray Depth should eliminate the black areas. Tutorial example here.

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 8 of 8
lewis.curry
in reply to: lee_griggs

Thanks @Lee Griggs

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