> Are your meshes forming closed shapes? If a mesh forms a shaped surface 
> without any back, any ray entering it get refracted and is considered 
> traveling inside something with an ior of 1.2. Now, it encounter the 
> second mesh, also having an ior of 1.2. So, the ior before and after the 
> surface is the same resulting in no further refraction.

Probably should have inside_vector in the meshes just to be safe, as well.

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