Knife project not cutting through 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:



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



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

Thanks.
After using a Knife Project tool check the Cut Trough checkbox in the Tool Shelf (T).


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).