Inconsistent / Unusable Alpha w/ Matte Objects

[ShaunDon]

Can someone tell me why V-Ray still does this to me? Here's a pass of an exterior canopy I'm rendering for an animation, however some of the building geometry runs through the ground -- it's uneven terrain, there's simply no better way to do it in production. So when I want these columns rendered on their own pass and terminating at the ground level, I select all my ground layer objects and in their V-Ray properties check off Matte Object and set the alpha to -1.0.

V-Ray has NEVER done this correctly for as long as I've been using it, and I know I've posted on it before. As you can see, for some ungodly reason my curbs -- even though it says in their properties when I check again that they are set to matte with no alpha -- still render in the alpha channel. Anybody know how to fix this?

Thanks guys,
Shaun

[voltron7]

This usually applies to glass, so it's Just a long shot Shaun, but does the material for the curbs have affect alpha checked? Sorry if this is not helping, I've not experienced this (or tested for) this problem...

JR

[Kr0no]

Just put affect alpha to 0...

[ShaunDon]

Thanks guys -- guess the email notification isn't working, I didn't realize anyone had responded. I'll try the alpha set to 0 rather than -1... I just don't get why that works fine for the pavement, grass, paint lines, etc., but not the curbs. It's suspect...

Shaun

[vlado]

Also make sure there aren't any double faces.

Best regards,
Vlado