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i'd like to stick vertices to another object,

make the cylinder take the selected vertices. i hope the explain clear

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2 Answers 2

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I guess what you want is to have the same vertices on the surface of the cylinder. In that case you have several solutions like delete the cylinder face and fill the faces between the edges and your shape, or use the Boolean modifier. Maybe the simplest way, though, is to use the Knife Project tool.

  • Separate your 2 objects. Select your cutting object, go in Edit mode, delete the faces only to keep the edges only.

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  • Back to Object mode, choose the top view, select the cutting object, shift select your cylinder.

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  • Switch to Edit mode, go in the Mesh menu > Knife Project.

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  • The shape is now printed on your cylinder. In the Operator box (bottom left of your 3D View) you have the Cut Through option if you want the shape to be cut through the cylinder. Now you may need to clean a bit the topology, depending on your project.

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Holding Ctrl will enable snapping, and snapping types can be picked here with the drop-down by the magnet that will toggle snapping.

Snapping toolbar

You'll want vertex. Remember you can move along specific axes to get it snapping exactly the way you want.

Exactly what you'll want to do is change the snapping type to vertex. Then grab your ring part and move in the y axis, holding Ctrl to snap it to the rim of the cylinder.

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  • $\begingroup$ can you explain mode ? $\endgroup$
    – AHMED
    Commented Apr 30, 2020 at 22:46
  • $\begingroup$ but the cylinder don't take the vertices in edit mode ? like third pic ! $\endgroup$
    – AHMED
    Commented Apr 30, 2020 at 23:27

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