Hi,
When using V-Ray renderer, the
Raytrace mode will be used for
Fake Shadows (XShadow works exclusively with the Scanline renderer) and the light which casts raytraced shadows needs to be selected (VRaySun).
Let me mention, that raytraced shadows require
Forest Material to work, because this plugin does the job of hiding or rendering the shadow / texture for each plane. Be sure that the material applied to the Forest object uses the
Forest Material as a base.
Attaching a sample scene showing this set-up. Hope you'll find it useful.
Best regards,