How To instal:
place The 'Jorrit Schulte' Folder in your preset folder
and place the inside of the 'CustomEffect.xml' file in Preseteffects.xml inside the ae support files (right before </Effects>, all at the bottom)
This Preset Calculates the distance between two points, or layers (2D And 3D).
it could be handy for things like 3d tracked footage, if you wat to know the pixels between 2 nulls so you can create a right sized solid.
theres also a Cm/Inch option, that could be used if you want to know the real life size of something, but you have to have a object in you're scéne that you know the size of, like a door (about 2M) so you can define a px Per CM/Ince Value.
there are also some visualize options so you can see your distance.

Controlls Example:

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