Rendering nothing but shadows

hobhobuk

Hey,

 

I know this has been discussed previously but any topics found had outdated links in or solutions not suitable for iRay.

Is this possible?  I basically just want to render the shadow without any of the model or enviroment.  Is there maybe a iRay shader which will completly hide the model while still somehow grabbing the shadows on the ground?

Or maybe any render pass options?

Thanks! :)