Push in

Push in cuts into a piece. Its first row sets what it works on: Tap faces or Draw a shape. Tapping a face or selected faces lowers the face to create a walled pocket. Subsequent taps push the face deeper. (Features like windows, mouths, and doorways typically start as a pocket.) Push in is the second tool under Surface in the Build tab.

Tap faces

Select faces, then tap Push in. Use the Size row (Small, Medium, or Big) to set the increment size for each tap. If Mirror is active, the corresponding faces on the opposite side are modified simultaneously.

The Floor switch determines the shape of the pocket floor on a curved spot:

• Scoop: each face digs along its own direction, so the floor keeps the surface’s curve. Dig into a ball and the bottom of the dent stays ball-shaped.
• Flat: every face digs along one shared direction, and the floor is flat. Dig into a ball and the result is a shelf. The direction snaps to the nearest straight or 45° direction, so a Flat cut comes out square no matter where the camera is. Flat needs faces that point roughly the same way.

Punching through

Every tap says how far is left: Deeper. 3 more to go through, or Punch through. The floor of a pocket will stop one step short of the opposite side of the piece. If the next tap would push through to the other side, a warning notification (One more press opens it right through) will appear. The final tap removes the floor and the opposite surface, creating an open tunnel through the piece. A confirmation notification (Cut complete.) will appear.

Punch through does it in one press: the selected faces go out the far side with no pocket and no step counting. Use it for a window, a doorway, or bars.

Draw a shape

Switch to Draw a shape and tap a face. Trace an outline dot to dot and close the loop, with ↩ Undo dot and ✕ Start over while you trace. When the loop closes, a Partway / All the way through switch and a Depth row appear.

Partway carves the shape in to the Depth you set; tap Push it in. All the way through turns the button into Cut through: a hole through the fig in the shape you drew. A shape that touches the face’s edge can be carved but not cut through, and a carve on a curved surface cannot cut through.

Reversing inward cuts

Pull out reverses a Push in cut one step at a time. It raises the pocket floor, and once the floor reaches the original surface level, the pocket seals flush. (You can also tap Undo.)

Limits

Push in requires a solid piece. A flat sheet has no inside to push into, so the action is blocked: use Pull out first to add thickness. Additionally, faces that point in different directions cannot be dug as a single pocket. If attempted, a notification will prompt you to select fewer faces.