Matte blocking light on rendered object, but not shadow

[davision]

Okay, I have a compositing problem. There may be an easy answer for this -- but I'm just not seeing it.

A simple scene explains my problem.

I have a renderable teapot that I want to composite into a photo.

I have placed a matte cylinder to block some of the VraySun light that is hitting the teapot.

I have a matte plane to catch the shadow of the teapot.

The problem is that the teapot shadow silhouette is "perfect" -- in other words, it seems to me that the light being blocked by the cylinder should prevent the teapot from casting a shadow in that area. For instance the lid of the teapot is in the matte cylinder's shadow so it is receiving no sunlight -- yet the lid is casting a shadow on the floor.

Is there a way to fix this in vray? Basically I need the shadow of the teapot to be partially "subtracted" or blocked by the matte cylinder.

If not in vray - what is the easiest way to create a composite of what I want.

See attached image to see the problem.

[Kai Hopermann]

Hey davision, try to uncheck "No Gi on other mattes" in the VrayMtlWrapper...
and it should appear like this

[davision]

Thanks Kai. But that's not what I need... I am compositing into a photo. And the cylinder is acting like an actual pillar in the photo in that it's blocking light. The photo already shows the shadow cast by the pillar -- so I don't a rendered shadow from the pillar too. Instead I need shadow of the teapot "subtracted" in the spot where the pillar's shadow "should" be.