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I want to drape and image over my Model (square-like shape) but only the face surface and not the lateral surface. So I need to select the face surface polylines and split 'em from the lateral surfaces. What im doing for now is to "shift select" all polylines itself which is a huge fiddly work :/

My Question: Is there an elegant workflow to select the face surface in a faster and more easy way?

SubsurfaceModel

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2 Answers 2

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You should use the Knife Project operation in this case.

Here is what you will do.

  • Add a new plane object and place it wherever you want to select.
  • Select your mesh and go to edit mode.
  • Then select that plane by pressing CTRL + LMB
  • In the last, press F3 to search for the operation named Knife Project.
  • Enter it.

enter image description here

enter image description here

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  • $\begingroup$ Thanks for the awesome guide. But I guess I didnt described my problem clearly. I want the entire surface to be draped with the image. not only a square like u showed me with the plane. Like this yellow marked area. If I hold and leftclick it also select the "side" surfaces so I need to zoom in and select each polyline by its own i.sstatic.net/gxTcP.jpg $\endgroup$
    – Stefan
    Commented Oct 6, 2022 at 9:54
  • $\begingroup$ You should use the `Shader Editor for this. imgur.com/a/uNc9VkH $\endgroup$
    – Muzammil
    Commented Oct 6, 2022 at 10:00
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Instead of trying to select all the top vertices, you could select all the others and just invert the selection.

Since the lateral geometries seems to me more regular than the top one, they should be easier to select.

Select one of the lateral faces, press SHIFTG (Select similar) then choose Normal. Or go to Select>Select Similar>Normal

enter image description here enter image description here

enter image description here enter image description here

You may adjust the Threshold if the faces' normals are not perfectly aligned.

Repeat that process for the 4 other faces and then press CTRLI to invert the selection.

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