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I'm a blender n00b and this may be a wrong tool for the job, but I've found some great features in Blender (like the caliper add on), so I'm pretty sure there's a way to easily (or at least bit easier) select two surface points of a loaded 3D .ply model somehow instead of moving the caliper/ruler points and its x y z axis individually one at a time?

Is there such a tool in Blender (or anything standalone) for selecting points from a surface of a loaded 3D model and measuring the distance of those selected points please?

Any explanation for how to do it any faster in Blender, instead of moving x y z axis of caliper (or ruler/protractor tool) one at a time attempting to align them to a surface of a loaded 3D model, or in any other tool that's able to measure that would be greatly helpful and appreciated. TIA

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My favorite tool for measuring things is the measureit addon.

Once the addon is installed and enabled, simply enable Show in 3D view > Tool Shelf (T) > Measureit tab. Then select the vertices you want to measure and click Segment. You can edit and delete individual measurements in the Properties Region (N):

enter image description here

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    $\begingroup$ it can be downloaded here: github.com/Antonioya/blender/tree/master/measureit $\endgroup$ – cegaton Nov 16 '15 at 6:41
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    $\begingroup$ @cegaton I just went to get the link, only to be distracted by a notification for this comment :P $\endgroup$ – gandalf3 Nov 16 '15 at 6:42
  • $\begingroup$ Thank you four answers both, the only trouble I have is that my mash has a really large number of vertices (about 230k, 440k faces, etc.) so in edit mode it's really slow to select two vertices among so many...is there such a thing in Blender that can reduce vertices but estimate the loss in precision of remaining points, or do it somehow without loss, that'd be great. TIA $\endgroup$ – IV1 Nov 28 '15 at 18:53

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