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I'd like to measure the area of the projected front, top or side view of an object. please give me some suggestion Thank you.

ChameleonScales
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supa
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  • You could enable edge length display. You can find this in the tab on the right in the viewport after hitting 'N'. It's under the 'display' tab when in edit mode. Then, if you select an edge or multiple edges, you can see the individual lengths of them. You still need to calculate the surface area though. – Hendriks3D Aug 18 '17 at 10:56

1 Answers1

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The easiest way I know :

  1. in orthographic top view, project the UVs from view with U > Project from View :

enter image description here

  1. in the UV/Image editor, export the UV layout as a vector image by going in UVs > Export UV Layout and selecting Scalable Vector Graphic (.svg) :

enter image description here

  1. in Inkscape or Illustrator or any vector program, select everything and disable the stroke to keep only the fill :

enter image description here

  1. still with everything selected, do a union boolean to get a single path :

enter image description here

  1. save the svg file
  2. back in Blender, go in File > Import > Scalable Vector Graphics
  3. with the path imported and selected, do Object > Convert to > Mesh from Curve
  4. do Object > Transform > Origin to Geometry and Alt+G to center the object
  5. still in orthographic top view, scale the object roughly :

enter image description here

  1. in Edit mode, enable snap to vertices, select everything and snap a vertex to its corresponding vertex on the original mesh, even if the others don't align :

enter image description here

  1. select that vertex and snap the 3D cursor to it with Shift+S > Cursor to selected
  2. select everything and make a vertex on an opposite side of the mesh active with Shift+Right Click twice :

enter image description here

  1. enable Pivot to 3D Cursor and Snap to Active :

enter image description here

  1. scale only horizontally with S+Shift+Z and point your mouse to the vertex corresponding to your active vertex to make it snap :

enter image description here

  1. now that the mesh is perfectly aligned and scaled, go in the User Prefs and enable the MeasureIt add-on :

enter image description here

  1. with everything selected in Edit Mode, go in the Tool Shelf > Display Tab, then click on Area and Show :

enter image description here

  1. the area is displayed as the green circle above shows.
ChameleonScales
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