Piero: Cycles Hair Shape Settings in Blender 2.90

[Ingmar Franz]

Interesting that this intersection line turns white when switching off “Cast Shadows” for the “Point Lamp” in the example file here:

[bkol]

Hmm, yeah, turning off shadows for the area lights in my file works a bit, too. The lines are still dark, but less noticeable. 

[Ingmar Franz]

Setting the number of maximum bounces for “Transparency” from 8 to 20 helps reducing black areas:

1) Before

2) After

“Transparency” is not affected by the “Max Bounces Total” setting!

[Ingmar Franz]

I would have expected that turning off  the visibility of the transparent plane  for “Shadow Rays” in the example file here would make this line disappear but it unfortunately doesn’t:

[bkol]

@duerer Wow, yes, that helps a lot! Combined with turning off shadows, it looks MUCH better. Thank you!

[spikeyxxx]

Okay, you’ve already figured out that turning of Shadows (in both feathers and bird) helps.

I’ve reduced it to the basics and gave the feathers a Transparent Shader and you were absolutely right @bkol that the lines are caused by the intersections.

With Shadows off:

compared to with Shadows on:

Increasing the resolution and the filter size also makes it a little better, but seeing that this is for an animation, it’s not worth the extra render times:

I’d actually sooner opt for a lower resolution, which also improves it a bit (maybe in combination with a denoiser ?)

Anyway, I’ve been trying things out and I didn’t find a way to completely remove those artefacts, sorry.

[bkol]

I haven’t tried rendering at a higher resolution yet, but I can bump it up considerably using e-cycles, and see what that does. I’m actually not going to animate it, as it’s for a picture book, so higher resolution shouldn’t be a problem. Thank you so much, @spikeyxxx , between you and @duerer, it’s looking really good! Undoubtedly I’ll have more questions before I’m finished, so most likely be hearing from me again.

[Author]

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