Shadow pass with matted objects

[Eric-S]

Hi I'm trying to get a render with matted object but I would like to have a shadow pass in the openExr buffer.

Right now are work around is the render the fumefx with the matted object using opacity black hole in the shader. Then Re-Render a other pass with fumefx and the objects not matted. But I need to render 2 time the fumefx. In a stereo show thats 4 time the render...

anyone knows how to do 1 render and to have fumefx Matted and with a shadow pass?

thanks,
Eric