Currently I have to use my eye to approximate a horizontal straight line for cutting an object with the bisect tool.

Is there a way to get the cursor to snap to a grid point (marked in red) so that the correct straight line is drawn?

enter image description here

I have used ⇧ Shift + S but that doesn't do what I want.

  • $\begingroup$ After you've marked the cut with the Bisect tool, but before you click <RET> to finalise it, open the bottom-left settings dialog and set Plane Normal X dimension to zero. $\endgroup$
    – John Eason
    Jan 22 at 19:26
  • $\begingroup$ @John Eason: It was right under my nose! Thanks $\endgroup$ Jan 22 at 19:45
  • $\begingroup$ No problem! Easy to miss... $\endgroup$
    – John Eason
    Jan 22 at 22:26

1 Answer 1


Create a plane, rotate it so it matches your perspective, and subdivide it so the quads match the big cells:

Then subdivide it again so it matches the small cells:

Of course you could subdivide it in a single step (39 cuts), but since a big cell always consists of 10 small cells and requires 9 cuts, it's easier to do in in two steps.

Now go to Object Mode, select both the plane and the object to be cut (here Suzanne), use knife snapping to the plane:

  • $\begingroup$ Perfect. This works too. $\endgroup$ Jan 22 at 19:46

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