In my last model ( Pendulum pentadecatriskell - 3D model by moroplogo (@moroplogo) [2417da1] - Sketchfab ) , there is a problem with the reflection of the pendulum on the translucid surface ( underlined in green on the screenshot ).
The reflection is done behind the pendulum and not in front .
For this surface , I use refraction.
When I choose an other opacity there is no reflection.
Thank you for your help !