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Tao Mao avatar image
Tao Mao asked ·

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:

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

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

Any thought of this?

Thanks!

imagealpha for geometry
22222-1333.jpg (22.4 KiB)
22222.jpg (282.7 KiB)
3333-3.jpg (337.8 KiB)
3333.jpg (315.2 KiB)
33333-2.jpg (191.3 KiB)
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Tao Mao avatar image
Tao Mao answered ·

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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Stephen Blair avatar image
Stephen Blair answered ·

Your png probably has premultipled alpha

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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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