Helix
A spring made of a round tube.

The Helix forms a spring around the vertical axis, with closed ends.
Properties
- Turns: How many turns. Partial turns, such as 2.5, are accepted.
- Height: The height of the spring, in meters.
- Radius: The width of the spring.
- Tube Radius: The thickness of the tube. High values can make the turns touch.
- Radial Seg.: How round the tube is. With four, it is square.
- Segments per Turn: How smooth each turn is.