Matte Shadow with Exponential Color Mapping

[jkaffenb]

Hi,
I am using a plane and applying a Vray Material Wrapper to it in order to have shadows on a background image without the plane showing up and it works fine with Linear Multiply color mapping, but when I switch to Exponential which doesn't give me the overbright light colored materials, I can see the plane.

Is there something that I am doing wrong or is this a bug? Any help would be greatly appreciated.

Thanks,
John

[img]ftp://ftp.hdrinc.com/4OMA/4cocolas/matte_shadow/matte_shadow_question-1a.jpg[/img]

[img]ftp://ftp.hdrinc.com/4OMA/4cocolas/matte_shadow/matte_shadow_question-2.jpg[/img]

[percydaman]

sucks dont it? I dont know of a good workaround either. anyone else?