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I have a simple rounded edge prism. I created a circle to use as the "knife" because I want to cut 2 holes through the prism.

I first select the circle, then select the prism, go into ortho view, click tools -> knife project, to cut it:

enter image description here

Nothing happens after cutting it except making an extra edge in the shape of a circle:

enter image description here

What am I doing wrong? Why is nothing getting but? What do I need to do to cut THROUGH the cube?

Thanks.

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After using a Knife Project tool check the Cut Trough checkbox in the Tool Shelf (T). enter image description here

If you place the cutting object on the 'clean' face it'll make the hole. If the cutting object is placed so it's overlaping the edges of the cuted object it'll create a geometry (edges) on it (as @lemon mentioned in his comment).
enter image description here

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  • $\begingroup$ ...and that gets a wow from me :) $\endgroup$
    – Patdog
    Commented Mar 25, 2017 at 22:40
  • $\begingroup$ In fact... I don't get how you obtain that. I knew this cut through option before but here this is not making a hole, just circular cuts (added edges) for both front and back faces. How do you obtain what can be seen in your gif? $\endgroup$
    – lemon
    Commented Mar 26, 2017 at 8:07
  • $\begingroup$ @lemon Please see my updated answer, which explains how it works (for me at least :)). $\endgroup$
    – Paul Gonet
    Commented Mar 26, 2017 at 17:56
  • $\begingroup$ @PaulGonet, thanks for this complement to your answer. But it does not work for me, even on a simple cube (a circle to cut in plain face of a cube). I always have created edges but no hole(s). Well, this is not really a problem as I can always delete the face but this difference in the behavior is weird... $\endgroup$
    – lemon
    Commented Mar 26, 2017 at 18:04
  • $\begingroup$ One point regarding 'cut through' in knife project is that you should use an orthographic $\endgroup$
    – b.reid
    Commented Mar 18, 2019 at 0:48

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