Extruding Polygons and Edges

on this page: moving vs. extruding | how to

Moving vs. Extruding

When you move, or translate a selected polygon, the polygon moves to the position specified by dragging. When you extrude a selected polygon you are not moving it, but duplicating it so that when it is moved, new sides form connecting the polygons. So when you extrude a polygon and then move it, the surrounding polygons stay the same shape; compare this to how the surrounding polygons change shape if you do not extrude the polygon first. For example, if you create a house with a chimney and move the selected polygon before extruding it, here's what will happen:

Not quite the right thing.

But when you move the polygon after extruding it, a nice rectangle shape is formed:

Just right for a chimney.

Note that this example uses Extrude Polygons .

If you had used Extrude Edges instead, the chimney would have no top:

Trick: If you accidently use Extrude Edges, you can close the top:

  1. Make sure the correct edges are selected.
  2. Click Form New Polygon From Selected Edges .

How To Extrude Polygons or Edges

  1. Make sure you are in the PEP editor.

  2. Select polygons or edges that you want to extrude.

  3. Click the Extrude Polygons button:


    or the Extrude Edges button:


  4. Move the extruded polygons or edges to a new position.

Jump to: