Selectively add a post effect to a person AND a 3D object without affecting the background

Let's say you are making a lens where you want to apply a post effect to the user but not to the background. For example, maybe you want the user to be in black and white but keep the background in color. This is pretty straightforward to do using a segmentation texture as a mask.

But now let's say you have some 3D accessory you want to add to the user such as glasses or a hat that extend past the outline of the person. Lens Studio doesn't create masks for 3D objects, so how do you selectively apply your post effect to both the person and the object? The solution is to create our own mask for the 3D object.

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