I have a female model and I want to know her waist width, so I select the edge loop, then use what tool? Is this only possible with python?
I recommend using the newer measureit addon instead.
To measure the sum of the length of a bunch of edges like this:
- Select the edges
- Set the Sum group in Tool Shelf > Measurit > Tools
- Click Segment in Tool Shelf > Measurit > Tools
Now the total length of those edges will be displayed at the bottom of the Measureit panel in the properties region (N).
Be aware that addons have no reliable way to track vertices, so if you modify the mesh your measurements may go awry.
You could use the new Ruler/Protractor tool located in the 3D view > Tool Shelf > Ruler/Protractor
Note that this was just added in Blender 2.67.
You're going to have to first enable an addon in your preferences called Measure Panel.
Next, go to the 3D view and press N. Scroll down to the very bottom and press the activate button on the Measure panel. Check Edge Length, select your edge loop and press Update Selection. The length slider will update with the length of your edge loop.
I recently updated an older script that does this: https://gist.github.com/zeffii/3839812
Rather than poling automatically, you press sum when you need to know the combined lengths, this also takes into account the blender unit settings.
- It also has a copy to clipboard function.
fair warning: it reports local measurements only at the moment. ( i should update that soon so you don't have to apply scale )