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I'm trying to reproduce David's answer here, and make variations.

When I assign a material other than transparent to the Boolean Difference cutting Cube, as in the attached blend file, the cutting shape stops being invisible.

I would like to have a way to materialize the precise area which is being cut through and keep the Cube invisible: either by representing a "fill" material as in the previous question, or by making the inside edge of the Sphere a different material.

Desired result 1

enter image description here

Desired result 2

enter image description here

Can the "cut" area be materialized with a different material, either the "fill" of the shape receiving the cut or the line along which it is cut?

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    $\begingroup$ If the boolean object doesn't have any materials, the first is used. Here is a modifier stack which produces your desired effect. $\endgroup$ – Leander Dec 13 '18 at 22:34
  • $\begingroup$ @Leander Thanks! I'm in Cycles! Sorry for not mentioning, I'l add the Cycles tag too. Your setup works with Cycles but not the "Inside" color (a fun add!) $\endgroup$ – MicroMachine Dec 13 '18 at 23:59
  • $\begingroup$ Doesn't make a difference, the screenshot only features the materials tab to show the stack of the 3 materials, the settings could also be cycles materials. $\endgroup$ – Leander Dec 14 '18 at 0:00
  • $\begingroup$ @Leander Make the GIF an answer! 👍 $\endgroup$ – MicroMachine Dec 14 '18 at 0:47

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