How to Depthless black material/particle effect?

[toltuk]

I do not know what the correct term for this is, but basically I’m trying to get it to where If you had a skull or hood, you would not be able to see inside of them even if you walked up and turned on a flashlight to see inside.
All for use inside cc4 and iclone.

Example image not actual project.

[thebiz.movies]

Not sure if this is what you are looking for but you might consider using the exclude effect to turn off all the lighting and IBL on the surface/mesh that want the depthless black on. I use this to turn a character into a shadow in this video:

IClone8 Tips - Using Exclude Effect Feature

[toltuk]

YES. Thank You.