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Rendering with Arnold in CINEMA 4D using the C4DtoA plug-in.
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Image alpha channel

3 REPLIES 3
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Message 1 of 4
Tao_Mao
788 Views, 3 Replies

Image alpha channel

Hi Guys, I met a really confusing issue.

I use arnold in c4d to render a massive images together with cloner, but the edges looks not right and really hard. Like below:

4810-22222-1333.jpg

my material setting is like this, for some reason Arnold detect the alpha channel from the image inversely, so I inverse the alpha channel

4811-22222.jpg

However, when I use the standard render engine in C4d with the built in material, it looks right....

4812-3333-3.jpg

4813-3333.jpg

4814-33333-2.jpg

Any thought of this?

Thanks!

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3 REPLIES 3
Message 2 of 4
Stephen.Blair
in reply to: Tao_Mao

Your png probably has premultipled alpha



// Stephen Blair
// Arnold Renderer Support
Message 3 of 4
Tao_Mao
in reply to: Tao_Mao

I think I've found the reason, I increased the ray depth and it became normal. The default ray depth is not enough for this kind of density objects.


Thanks.

Message 4 of 4
Tao_Mao
in reply to: Stephen.Blair

I think I've found the reason, I increased the ray depth and it became normal. The default ray depth is not enough for this kind of density objects.


Thanks.

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