I used the spin operator to duplicate a circle, after that I tried to knife project all circles (single object), all the duplicated circles don't have an effect but the original circle is cut out. Why is that?
It's a bug
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$\begingroup$ The knife project tool does odd things like that, I know. I haven't figured it out either yet. $\endgroup$– Thom Blair IIICommented Mar 25, 2014 at 20:46
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$\begingroup$ I know that cutting holes into mesh in general is a problem. What happens if you place the circles slightly over the so that it is not actually a hole? $\endgroup$– VaderCommented Mar 25, 2014 at 20:49
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$\begingroup$ @Vader it seems that knife project needs intersecting edges to cut properly. $\endgroup$– stackerCommented Mar 25, 2014 at 21:55
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$\begingroup$ Stacker, I'm having a discussion about this issue now on BlenderArtist.org $\endgroup$– Thom Blair IIICommented Mar 25, 2014 at 23:20
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1$\begingroup$ It'd be nice to see "it's a bug" as the accepted answer. $\endgroup$– MattCommented Mar 26, 2014 at 16:24
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1 Answer
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I got it to work by subdividing the target object a lot:
When the target was not subdivided, not all of the knife circles would cut, but once I subdivided, they all cut. I have no idea why though.
However, trying to get it to work on a cylinder is more difficult. The way I got around it was:
Add a circle mesh and set the Fill type to Triangle Fan:
Then when you do the knife projection, all the circles will cut:
Then you can extrude the cut circle into your cylinder
answered Mar 25, 2014 at 20:54