Extrude Faces duplicate faces, while keeping the new geometry connected with the original vertices.
The axis on which faces are extruded along can be set interactively. Faces are extruded by default along their averaged normal. The extrusion can be limited to a single axis by specifying an axis; see 锁定轴向.
The extrude tools differentiate in how the new geometry is connected in itself. Only the border loop gets extruded. The inner region of the selection gets moved unchanged with the extrusion.
Only the normals of the new faces created from the extrusion will be flipped.
Removes and connects edges whose faces form a flat surface and intersect new edges.
Even with the Proportional Size set to it's minimum, it will extrude the selected face as well as the new geometry and they will be layered on top of each other.