[SOLVED] Maya: XGen -> each hairstrand id in arnold (via AOV)

goekbenjamin

Hey
In Unreal engine
(https://docs.unrealengine.com/en-us/Resources/Showcases/PhotorealisticCharacter#hairauthoring)
you can take advantages for hair texture when you use an "Unique ID"-Map (which will assign different color-shades to single hair strands)

Now i was wondering, is it possible to arnold-render XGen-Hair somehow so i can generate this map?
Like with an AOV? Each hair strand gets another color variation and show that in the render?

How would you do that? Is that even possible though?

oglu

Maybe this could help.
http://www.youtube.com/watch?v=_ZUY2XFm94Q

goekbenjamin

oglu said:

Maybe this could help.
http://www.youtube.com/watch?v=_ZUY2XFm94Q

That looks super promising Christoph!
Vielen Dank!

I will have a look and try to reproduce it and will post a result here after that.

goekbenjamin

This suggestion worked great, thanks again @oglu !

Luribb

Seems like the link is broken Would it be possible for you to explain how you solved it?

goekbenjamin

Luribb said:

Seems like the link is broken Would it be possible for you to explain how you solved it?

i am so sorry, i barely cant remember also, I see I have forgotten to post my result as I stated in the previous post...damn

Neox

Luribb said:

Seems like the link is broken Would it be possible for you to explain how you solved it?

if you just need a lot of random values but not each individual hair, you can take a up to 4x4 randomly colored grid as texture and apply that to the converted mesh, as the UVs are created the way they are you would have 16 random colors scattered over the entire asset, not one ID per hair, but pretty random

https://polycount.com/discussion/225558/xgen-eyelashes-eyebrows-best-way-to-convert-to-hair-cards

Luribb

Ah no problem @goekbenjamin ! Thanks for the tip @Neox!
I ended up creating a render override with the AiColorjitter, works pretty good!