Hdri as a matte pass and separate?

[refract]

Just curious if there is a way to set the Hdri to 'invisible', but have it output as a separate pass? I'm using the lightdome light with an Hdri pluggin in.
I think in a previous version of Vray I was able to set it to invisible, but it kept it with Alpha. Or no? I'm using the latest stable build released for my work.. no nightly
builds yet.
thx

[tashko.zashev]

Hi,
If you set Dome light to "Invisible" you will get alpha on it.
In your case you could try to set the HDR file as a Background texture and keep the "Invisible" option for Dome light on or you can use Multi-matte render element to extract the background (Dome light HDR) in separate pass.