I have a small problem when working with matte objects and shadows being cast onto them when using any form of GI.
This is a quick example of a dummy scene with a VRay Sun & Sky in it.
The render comes out like this:
Now I am rendering our the plane alone and as a second pass the sphere with the plane set to a matte object (alpha -1, affect alpha, shadows).
The result looks like this:
2 things are looking different.
1-) the color bleeding is slightly off in the comped image.
2-) the shadows have lost their color and are darker.
Has anyone found a solution to this? I’m having the same issue.
Surely there’s an easy / correct way to use the Matte/Shadow object properties for compositing.
VRay seems to be attempting to store this GI-influenced shadow color and GI bouncing as a RGB colored Alpha channel (not just greyscale) - which you can see in the VRay VFB.
However, most file formats and compositing packages I know of only allow for a greyscale 0-1 alpha channel… so I’m not sure how to use this data at the moment.
Looks like matte objects are not affected by Gi in the shadow area.
This is a known issue. For the moment we are discussing different approaches to workaround it.
