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Rendering with Arnold in CINEMA 4D using the C4DtoA plug-in.
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Why isn't the alpha working in Arnold for Cinema 4D v5?

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Message 1 of 16
demodunk
759 Views, 15 Replies

Why isn't the alpha working in Arnold for Cinema 4D v5?

 
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15 REPLIES 15
Message 2 of 16
lee_griggs
in reply to: demodunk

Can you please provide more information? Which file format are you using? PNG?

Lee Griggs
Arnold rendering specialist
AUTODESK
Message 3 of 16
demodunk
in reply to: demodunk

I've tried both png, tiff and psd and nothing seems to work.

I've attached a simple scene file.

alpha-test.zip

Message 4 of 16

Seems like a bug. It works if you move the base material after the polygon selection tag.

1892-alpha-issue.png

Message 5 of 16
demodunk
in reply to: demodunk

Hmmm.. doesn't work for me. I get white, scaled cirkels where the red i supposed to be.

screen-shot-2018-06-28-at-112757.png

Message 6 of 16

I'm not sure it's Arnold's fault, I've got the same result with the standard renderer.

Message 7 of 16
demodunk
in reply to: demodunk

Working now after I removed the actual alpha from the black and white pic.

Really strange...

screen-shot-2018-06-28-at-113515.png

Message 8 of 16
demodunk
in reply to: demodunk

Thank's for taking a look at my file.

You know if there is any way to file a bug report regarding the stacking order?

Message 9 of 16

This forum post stands as a bugreport. I'll try to fix it for the next release.

Message 10 of 16
demodunk
in reply to: demodunk

Aha, ok, thank's!

Message 11 of 16
demodunk
in reply to: demodunk

So, just found another bug...
I changed the bump height on the base material to 0,05 and the alpha disappeared.

Changed it back to 0.1 that I had before and still the alpha is gone. Had to press re-do a couple of times to get it back.

This seems like a pretty buggy software.

Message 12 of 16
demodunk
in reply to: demodunk

Happens when I change other parameters too.
Turns out I needed to close the IPR window and open it again.

Message 13 of 16

That's strange, I'll try to reproduce it.

Also note, that instead of material stacking, you can use the layer shader, which gives you more control and kinda the recommended way with Arnold.

alpha-test-v2.zip

Message 14 of 16
demodunk
in reply to: demodunk

Thank's I tried that but I never got that to work either.

Message 15 of 16

Your original scene should work now with this wip build, please give it a go if you have some time:

https://safeshare.solidangle.com/index.php/s/ljxlVTXMM3eaGLz

password: c4dtoawip

I'm also working on some other issues regarding the native decal workflow reported earlier.

Message 16 of 16

The fix is now available in 2.3.1.3.

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