Wrapper Material not working

[boundary]

I have created a simple test scene in order to try and use the Wrapper material as a way of producing shadows onto an environment. I have an HDR in the environment map and although the material is correctly rendering as transparent no shadows are being rendered? I have followed all of the videos and tutorials I can find and even updated my Vray to 3.6 but still no luck! - its driving me nuts! any help would be appreciated.

Image A is a screen shot showing the wrapper material mid way through render - shadows are good
Image B shows the completed render - no shadows are rendered.

[Mousa_SA]

Be sure that you have added the HDR image as Background under the "Environment" tab, currently the Wrapper material is only working with GPU mode if Dome Light is used, and try to use "Matte_Shadow_Receiver" material from "Diagrammatic" category.

Hope this helps.

[teknoel]

Switching to GPU rendering got my wrapper material working so thanks for that advice!! hopefully this workflow can be improved in the future.