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How to create the square (plane) about such dimensions as the length of some other edge from the scene?

blender

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There are several ways to model with precision, and the first step in this kind of modeling will be to turn on Edge Length and / or Face Area options in 3D View > T panel > Mesh Display rollout.

mesh display options

After duplicating the original edge there are several options to model square plane then.

Extrude with snapping

  1. Turn on snapping with Shift+Tab and set it to Increment. Alternatively, without turning it on hold Ctrl while extruding.
  2. Extrude edge and see the values of the edges.

Extruding with snap

Duplicate and rotate original edge

  1. Set the Pivot point to Active Element, duplicate original edge, rotate it by 90 degrees around appropriate axis (in this case Z).
  2. Select all and press W > Remove doubles (because one appeared when you rotated the edge).
  3. Select 2 vertices on the edges' ends and connect them with F. The triangle was created.
  4. Subdivide the diagonal edge. Select the vertex which apeared after subdivisioun, turn on snapping, set it to Vertex and grab selected vertex to align it by X and Y axes with already existing vertices.

GIF - duplicating and rotating edge to make square plane

Read:

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  • $\begingroup$ Thank you. I think that the first method works only when we have "typical" dimensions of the edge that it is possible somehow to fit them to the grid (I have 0.1707 - values which appear at extrude don't correspond to this length). As for second - in the shown example origin of the object (edge) lies precisely in the middle of the square which later is being created. How to get it? $\endgroup$ – Neri Feb 1 '16 at 2:39
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    $\begingroup$ @user3224596 As for the first method it's quite easy to look at the length of the original edge (before extruding) with Edge length turned on, extrude and type those exact numbers to extrude out. Second - after extrusion is ready select all edges, press Shift+S > Cursor to Selected, go to Object mode and set origin to 3D Cursor. $\endgroup$ – Mr Zak Feb 1 '16 at 12:15

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