blender · HeyBraza shows you
blender boolean modifier not cutting
HeyBraza points at the operation dropdown, the object picker and the mesh cleanup steps that make booleans behave.
a boolean needs a clean, closed cutter - doubled vertices, holes or flipped normals make it silently do nothing or carve the wrong side. clean the mesh first and the modifier just works.
short answer
the boolean goes on the object being cut, not the cutter, and the cutter has to be a closed solid that passes all the way through. if it still fails, merge by distance and recalculate normals (shift+n) on both meshes - open or doubled geometry breaks the solver.
or do it yourself
- 1select the object you want to cut (not the cutter), then modifier properties > 'add modifier' > 'generate' > 'boolean'.
- 2set the operation to 'difference' and use the eyedropper/object field to pick your cutter object.
- 3clean both meshes: edit mode, select all (a), then m > 'merge by distance' to remove doubled vertices.
- 4fix normals on both: still in edit mode with everything selected, press shift + n to recalculate them outside.
- 5make sure the cutter is a closed solid that fully passes through, then hide it (h) and apply the modifier via the dropdown > 'apply'.
steps last checked
let HeyBraza do this with you
HeyBraza teaches you software while you're using it. hold a key and ask out loud - an ai tutor that sees your screen walks you through every step in real time, pointing and highlighting on your real work, talking you through it as it goes - not someone else's tutorial.
downloadcommon questions
why does the boolean cut the wrong part away?
the cutter's normals are inside-out - select it, edit mode, a, shift + n, then try again.
do i have to hide the cutter object?
yes, or it renders on top of the cut. press h with it selected, or move it to a hidden collection.