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Fabrizio Bruno avatar image
Fabrizio Bruno asked ·

Arnold transmission C4D in render is black

hi, i have a problem with transmission, i'm trying to have water droplets on a can model, do you know why is black? i turned opaque of on my droplets and have transmission set to max on my material.schermata-2021-01-13-alle-180812.png

arnoldc4dtoa
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Lee Griggs avatar image
Lee Griggs answered ·

As I recommended earlier, you need to enable caustics for the drop shader.


1610694503387.png


1610694503387.png (1.3 MiB)
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i did it but nothing seems changing...

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Fabrizio Bruno avatar image
Fabrizio Bruno answered ·

here the project ->>>> https://we.tl/t-xb7EK7DaBu

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Fabrizio Bruno avatar image
Fabrizio Bruno answered ·

ok update, the problem seems appear whenever i put a ground plane ! but why? i need a ground for my animation....cant escape from this situation...schermata-2021-01-14-alle-151829.png


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Fabrizio Bruno avatar image
Fabrizio Bruno answered ·

the funny thing is that the droplets on te top of the can are transparent...look ate the screenshot.


the things seems to not change even if I apply another material on the can...schermata-2021-01-14-alle-150223.png


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Upload the scene somewhere, please.

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the C4D file you mean?

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Lee Griggs avatar image
Lee Griggs answered ·

It looks like it is because the drops geo are intersecting the can and therefore are refracting the dark interior of the can?

Other things to consider:

Opaque should be disabled (although this is automatically computed now).

What are the normals like?

Is transmission_ray_depth high enough?

Are the lights visible in transmission rays?

Is caustics (Advanced) enabled?

If that doesn't work, upload a simple scene somewhere.

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Fabrizio Bruno avatar image
Fabrizio Bruno answered ·

The point is I just did a sphere and a cloner on the subdivision surface and apply on that cloner a simple standard surface with transmission set to max. In maya I don’t have that problem but in cinema 4d I have it. The weird thing is that on the top of the can the droplets are fine, they are simply transparent how suppose to be. I’m frustrated..

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And my point is that we don't know any of your settings.

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Stephen Blair avatar image
Stephen Blair answered ·

What are the shader settings on those droplets?
I did a quick test in Maya and I didn't get dark droplets with this clear_water standard surface:

clear_water.ass.txt

Just save the file, remove the .txt, and load it with Arnold > Materials > Import


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