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I know there are a million answers on here about measuring the length of a curve (like this one, which is pretty much what I want to do) but I feel like this situation is a tiny bit different. I have a scene like this:
enter image description here

Which is the real top of a skull, imported in "real" units. I'd love to measure the circumference of that hole in the skull and return the length in centimeters, preferably by drawing on it. I was drawing a curve by eyeball and using the CurveTools addon to get the length, but as you can imagine, its often hard to tell if you're in a correct 3d Plane and actually touching the surface and I often had to manually adjust each point I drew. What I would love to do is "paint" like so: enter image description here And then have Blender measure the length of that, I imagine by creating a curve where that selection is? I tried separating the mesh by selection and then converting that new chunk into a "curve" and that technically happened, but the new curve couldn't be measured by Curvetools, not sure why.

Blender 2.9 if it matters.

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Nevermind, found my solution here:

How can I make curves "stick" to a model?

Instead of drawing a selection and then creating a curve from that, you can draw your curve and have it snap to the object as you're drawing.

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