Transparacy not working corretly with hair?

[DrHemulen]

I've got a bit of an issue with hair. I'm getting "holes" in the hair models, where there isn't supposed to be any. It seems that Octane has a strange way of rendering layered objects with opacity masks. Here's an example (Harlow Hair from the DAZ store):



Notice the hole where the hair is thickest, over her left ear. Compare it with the DAZ render:



What's going on? Is Octane just giving up after a few layers and just discards the rest of the info for the model? I can't seen to find any "transparacy depth" or similar slider

It's an autogenerated material, but the transparacy mask is correctly applied (compared to the DAZ material).

OR is this a case of Octane doing things correctly, and the DAZ render relying on an artifact of the engine?

How's everybody else doing hair?

[birdovous]

I think the DAZ in your render shows exactly the same. Only in Octane you have different light model than in DAZ so it makes the transparent and semi transparent zones to be more prominent...

[SimonJM]

Just tried the 'experiment' and I what I get in Octane is just about what you have, which does not surprise me greatly as the ears are shadowed by the hair. I get a very similar result in DS when I use what I estimate to be a matching light setup (one Advanced Ambient, one Advanced Direct).
<edit>
Added a DS version with no lights (except the 'headlamp' with DS adds 'invisibly' when no other lights are present) which gives the same sort of look as you get.
</edit>
<edit2>
Of course, brain being fuzzed, I now have properly read your post ...! Yes, I see what you mean and yes, it does look wrong!
</edit2>
<edit3>
Done another DS render, this time with a simple backdrop which does show up the 'hole' which was being 'lost' in the grey default backdrop.
</edit3>

[DrHemulen]

Thanks, that one with the cyan background setteles it, it's just at quirk with that particular hair model apparently