Realtime cross section of thousands of objects?

For CAD it’s usual business to make cuts… so naturaly CAD-software is design to make them…
Polygon-modeling sofware usually is used to built what you will see in the endproduct and not for cutting it away.
Anyway: There was something like this:

… but it seems to this one isn’t working for nowadays blender…

…ohh wait… just had to look at this website:

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