Make Mesh intersection material transparent

Hello!
Once again I turn to the forum in hope of getting help.
My idea is:
I have several objects, and a separate object (for example a Cone). I want the objects to become half transparent on the place where the cone intersects them.
Basically the cone should be like a tool for insight into the object depths.
The cone itself should be invisible.
I am looking for either a material, or preferably a script way to implement this, since it should be usable in an add on.
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My idea was to determine the intersection surfaces ob the objects and lower the material’s alpha in the script. However I have no idea how to do that.
I would appreciate if anyone knows a way! Thank you!

Greetings, Aschenstern

I’d do it with booleans…
Duplicate your objects, and give them an transparent material.
Use a boolean modifier with the original objects, set to “difference”; And for the copies, also a boolean modifier set to “intersect”.
Creating a python script for doing this should be fairly easy.

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