I am creating a scene with plastic toy cars in a stylized look. For cartoon black outlines, I am using solidify modifier with a black material offset.
This outline works for everything but the transparent plastic, when I add the modifier, the object loses the "back side" of the transparency. I can see the car in the plastic wrapper, but I don't see what's on the other side.
I want the plastic wrapper to have the same black outline, but however I tweak the transparency settings, I am always getting an undesired result.
Can anyone please help me how to reach this effect?
Second picture shows my settings of the outline material.


