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Goeran Thorén avatar image
Goeran Thorén asked ·

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

alpha for geometry
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Lee Griggs avatar image
Lee Griggs answered ·

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

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Goeran Thorén avatar image
Goeran Thorén answered ·

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

I've attached a simple scene file.

alpha-test.zip


alpha-test.zip (1.8 MiB)
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Peter Horvath avatar image
Peter Horvath answered ·

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


alpha-issue.png (13.7 KiB)
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Goeran Thorén avatar image
Goeran Thorén answered ·

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


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Peter Horvath avatar image
Peter Horvath answered ·

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

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Goeran Thorén avatar image
Goeran Thorén answered ·

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

Really strange...

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


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Goeran Thorén avatar image
Goeran Thorén answered ·

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?

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Peter Horvath avatar image
Peter Horvath answered ·

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

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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.

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Goeran Thorén avatar image
Goeran Thorén answered ·

Aha, ok, thank's!

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Goeran Thorén answered ·

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.

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