LFS Editor/Guides/Extrude and Lathe Functions

To use the extrude or lathe functions in the Modeller, first you select a series of points in order to create a cross section that you will either extrude linearly (extrude) or rotate around a point (lathe).

You can see the cross section by enabling the trace option in point mode, then selecting points in the correct order.

The trace function has two modes:

• incl - include the last selected point
• excl - don't include the last selected point

It can sometimes be confusing which order to select the points, and then choose 'inside' or 'outside' to get the desired effect.

Extrusion

• Put your viewpoint on the side so that you will pull the extrusion towards you
• Select the trace points in anti-clockwise direction as seen from that point
• Create extrusion by clicking extrude (and select outside, inside, etc.)
• Pull the points towards you

Then you should find that your inside / outside request is respected.

Lathe

• Put your view on the side where the lathe operation will initially head towards (at the start of the curve)
• Select the trace points in anti-clockwise direction as seen from that point
• Rotation will take place around the last point you select (which may or may not be included as part of the cross-section)
• Go to 2D view and create lathe object by clicking lathe (and select outside, inside, etc.)