Vray shadow mattes

[syberand]

I have a particle system I want to render out for itself and add later on. My problem comes when I want to include the shadows. You can see my settings and hopefully my problem. Is there a way to only get the shadows from the particles and not the other objects in the scene?

[hermit.crab]

I presume everything except the particle system is shaded with the VRayMtlWrapper? If yes, try turning the "No GI on other mattes" option.

[syberand]

Already enabled. And yes, I only want the shadows on the one object and the shadows it cast. Using vray 5.something

[hermit.crab]

Just noticed we are in the GPU forum, pardon. Sorry to say, in GPU the "No GI on other mattes" option is always off (we should grey it out like in Maya). I'm not sure if there's another workaround except rendering in CPU.

[syberand]

ah okay, thanks. Grey out would be nice, could have saved an hour of searching