Hello everyone. I can’t solve this problem for like month, so I will be glad for any advice. I try to place objects on real photography, so in order to make objects reflection on the floor/walls, I need to apply matte wrapper material to floor/walls as a shadow catcher and make the walls invisible to reveal the photo. Basically as they show in the video: Vray For Sketchup #5/4 - Material Wrapper in vray for sketchup - YouTube .
I follow the instructions, yet my wrapper material doesn’t catch any shadow. It does reflect materials, when i use a very glossy material as a base to the wrapper, yet still no shadows. Any ideas, where should be the issue?
Is the material’s texture from a PNG or a JPG ?
I known that PNG images in SketchUp don’t ‘receive shadows’, but JPG ones do ?
Is there a setting to affect this ? Vray is not my métier…
Material’s texture is from Vray’s library, so there yould be no reason for the wrapper to reflect material, but not to catch shadows 
But thank you for your reply 
Looks like a Vray material setting…
Honestly, I don’t even have CUDA/RTX option, I have only CPU/GPU and I always render on CPU. But thank you for your response
I’ve already tried every setting combination, still no success… I’ve been struggling with it for couple weeks now and have tried every guide I was able to find on the internet…
You’re welcome!
Try switching from one to another and see if it works. (CPU > GPU, or GPU > CPU)
As you saw in the animated GIF, it is possible, and it’s working.
Okay, so after some playing with the CPU/GPU and different settings: on CPU rendering there are no shadows, but reflection is fine, on GPU matte catches shadows, but doesn’t reflect objects
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