z- depth matte particle problem

[ralf_breninek]

Hello every body,

I think I have seen a similar problem here already but cannot find that thread again.

My problem is, I am using a plane with a diffuse Octane Material which has got an C4D gradient in its Opacity chanel to produce a smoke puff. I then use the plane as a thinking particle. Unfortunaltey the z-depth pass shows parts of the clouds as if they are further back. Specular, Glossy, Diffuse depth dont seem to have an effect.

Has anyone got an idea on how to overcome this?


Cheers
Ralf