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I have a simple scene where I have simple planes and textures using the alpha channel of the PNG as transparency.

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The way I created the files makes the Alpha channel 000 black and 255 pure white. Here is one texture if you want to examine it.

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When I prepare a scene using cycles, it works fine.

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I can add more planes this way.

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But when I add a third one, the intersection of the planes begin to form a shadow.

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Stacking 4 planes make the shadow obvious. It is rendered on the spot where the images are combined.

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Here is the blend file without textures.

What settings can I change? I changed bounce samples... but this is not about bouncing...

Any tips?

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  • $\begingroup$ did you increase the number for Transparent bounces? i.sstatic.net/WvPeA.png $\endgroup$
    – user1853
    Commented Jul 8, 2018 at 22:26

1 Answer 1

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Currently you have a maximum of 4 transparency bounces:

enter image description here

So after 4 transparent surfaces overlap you will get errors.

You need to increase the number of transparency bounces so that there are as many as transparent surfaces a ray has to go throuugh:

enter image description here

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