Light linking with V-Ray Sun/Sky

V-Ray V-Ray for Maya Issues
, , ,
1

Hi,

We’re using V-Ray Sun and Sky with physical camera. I can turn off shadows in the render stats of the object, but light linking to transform1/VRayGeoSun doesn’t work at all - for shading group or geometry. I’m wondering if the link with VRaySky needs to be broken, but it doesn’t show up as a light. I tried using a vrayobjectproperties set but that doesn’t have any way to effect direct lighting (the shadows are direct / in the lighting render element). Is there a way to do this, and if not, is it in the works? I can make a separate render layer, but that’s a definite compromise - I feel this is essential for sun and sky. Thanks,

Jens

2

We reported that issue to the developers.
For now as a workaround you can duplicate the objects VRayMtl and set the opacity of the duplicated one to black. Then open the shading group of the original VRayMtl, go to Attribute>V-Ray>Material Override and set the duplicated VRayMtl in the Shadow material slot.

Thanks for the feedback.

3

Hi Zdravko,

Thank you for this workaround, although it doesn’t seem to solve the problem when you need an object to cast shadows from a light but not the sun. From my quick test this seems to do the same thing as turning off the ‘cast shadows’ render stat.

Jens

4

Unfortunately V-Ray doesn’t support shadow liking (only light linking).
At this point this can’t be implemented.

5

Hello again,

I believe you’re already working on a fix, as what I’m asking about is not shadow linking. Let me explain my request with an example. I have cube A, cube B, a VRayRectLight and VRaySun/sky. Currently using the relationship editor to set light linking for VRaySun/sky does not work. No matter what, I can’t ‘turn off’ VraySun or sky for cube B. So in this scenario I’d like cube A to be affected by the sun/sky and the VRayRectLight, and cube B affected by only the VRayRectLight. Let’s say VraySun is hitting cube B and casting an ugly shadow onto cube A. If I could unlink VraySun from cube B, it would no longer be illuminated from the sun, and it would also not cast a shadow from the sun. Cube B would still be receiving light and casting shadow form the VRayRectLight, though. The only way around this currently is to make a separate render layer for cube B. Thanks.