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Is it possible to cut only the existing geometry of an object using a particular shape (for instance the circle in red) to add vertices only where the shape bisects an existing edge?

Here

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  • $\begingroup$ Possible duplicate of How would you cut a shape out of an object using another object? $\endgroup$ – Shady Puck Jul 10 '17 at 20:43
  • $\begingroup$ Nope, i saw that, its adding lot of poly i dont need, i dont want to get circular area with as much edges original circle had, i want to just add cuts where my circle is overlaping existing geometry as in my picture ... straight cuts. $\endgroup$ – astromedia Jul 10 '17 at 20:47
  • $\begingroup$ Try subdividing each edge as 1 time per vertex (W > Subdivide), aligning the vertices with your demo circle, and using the Knife tool (K) to connect them and cut the in between faces. $\endgroup$ – Shady Puck Jul 10 '17 at 20:54
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    $\begingroup$ Thx for answer but this is just simple example, would be possible some more "automated" aproach? Imagine i dont want to cut 8 polygons but 800, this process would kill me :) $\endgroup$ – astromedia Jul 10 '17 at 20:59
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    $\begingroup$ Because i dont know the orange mesh, i want to create it based on that circle, this is whole point of this question :) $\endgroup$ – astromedia Jul 11 '17 at 13:53
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I will assume that you know how to use the Knife Project tool but if not, there are plenty of tutorials on BSE that can show you.

Here's a simple technique that might help you achieve what you're after:

Get everything ready to use the Knife Project tool but just before you do, select all of the vertices of the shape you want cut, and add them to a Vertex Group. Once you do that, cut your shape out with the Knife Project tool. You can then Deselect the vertices from your original Vertex Group and use the Dissolve Vertices feature to get rid of the unwanted vertices that you added with Knife Project:

enter image description here

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  • $\begingroup$ Looks promissing and working, thx a lot. Marked as solution. $\endgroup$ – astromedia Jul 11 '17 at 13:53

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