Hello,
i have a question about conforming hairs.
When the scalp doesnt fit the head exactly due to scaling/morphing, i experience a slightly darker edge then the usual skin along the forehead.
I was able to track it down to the ambient occlusion in my lights.
Is there a possibility to EXCEPT a single material from AO, that looks quite easier then to plug an AO node in all other textures and leaving that one out :D

Thanks.

You can make a figure/actor/prop "Invisible to raytracing", which will stop it creating any AO. However, if you are using raytrace shadows it will no longer create any direct shadows either, which can be a problem.

The "Invisible to raytracing" option is in the body/actor/prop Properties palette.

(edited to add:) also, invisible to raytracing means it won't show in such things as Reflection, Refraction..

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)

what if the scalp itself is just made invisible ( uncheck visible in its properties, asuming the conforming hair has scalp as a separate prop)
You  then  have the HEAD body part  that can  have the AO applied and the hairparts themselves should cause shadows on the head, no?

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I did an 8 hour render last weekend, and I forgot to tick the Visible in Raytracing on a figure. doh!

But, it made a good illustration of Visbile in Raytracing, if you look at the shiny floor. 
Dude on the left isn't casting a reflection.

oops, forgot to attach the image

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I would be a bit miffed if I had no reflection. Having only half a shadow is bad enough.

I found out about RT and reflections when some hide/show clothing parts for Rhiannon's Elsa Wylde produced AO artifacts. I set up two mirrors at an angle to show the artifacts from all sides in a forum thread picture. Then somebody suggested making the clothes invisible to raytracing.

Sure enough, my next render came out with one clothed Elsa and three nudes. I put the pic in my gallery (Mirror mirror on the.... eeeeek!).

Well, that's my story, and I'm sticking to it.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)