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Is it possible to select all edges with a specific length?

I have a very exotic problem. In a computer game model, there is audience projected on several billboards, and depending on a billboards width, I know the number of characters seen in that billboard.

I want to find out the approximate complete count of characters in the audience.

The problem is, that there are 4146 billboards, which I can't count by hand, but classify by their length at least, and then calculate it up:

enter image description here

Any way to select, for example, all the widest audience billboard edges seen on the terrace?

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Yes.

Select an edge and press ⇧ ShiftG> Length. By default this will select all other edges with equal length to the active edge.
By adjusting the options in the redo panel (F6) or at the bottom of tool shelf (T), you can also select edges with greater or lesser lengths and compare lengths with a threshold to select edges that are not exactly the same length, but similar.

enter image description here

Once you have a partial selection on the billboards you want to select, you can select all geometry connected to the selection with ⎈ CtrlL. Or in the case of a plane, by switching to face select mode (⎈ Ctrl↹ Tab) while holding ⎈ Ctrl.

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Being in Edit Mode select a desired mesh (or meshes) using a face selection. Then go to Select-->Select Similiar-->Perimeter (or Area). enter image description here

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    $\begingroup$ Also note that this is accessible from the keyboard with Shift G while in face select mode. $\endgroup$ – gandalf3 Aug 13 '15 at 21:27
  • $\begingroup$ Perfect! Wish I could accept both answers =) $\endgroup$ – Ray Koopa Aug 14 '15 at 18:57
  • $\begingroup$ @Ray Koopa, right choice :). I think gandalf3 's answer is closer related to your question. Nice to hear I helped anyway :). $\endgroup$ – Paul Gonet Aug 14 '15 at 19:14

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