Create real matte shadow vray 3.6 3dsmax problem

[etiennestereo]

Hi guys,

I recently got an issue with my production. Maybe someone could help me handle this.

So in fact, here is my problem shown on a test scene :

Here is the scene



This is the render I would like to get

here is my background :



And I would like to render my teapot (in this example) with all the background objects in Matte Shadow
For this purpose, I used VrayMtlWrapper and here is the result I got




As you can see on the donut who has a VrayLightMtl, we have a shadow...

So the composite result I get is :



Did I miss a thing ? Do you have an advice that can give me the result I want ?

Or maybe someone can give me the workflow to adopt for this kind of stuff ?

Thanks for your time

Best regards

Etienne