# Extruded arc shape geometry not closing

**URL:** <https://discourse.threejs.org/t/extruded-arc-shape-geometry-not-closing/78435>\
**Category:** Questions\
**Tags:** extrude-geometry, path, shapes, geometry\
**Created:** [February 20, 2025, 9:33pm UTC](https://discourse.threejs.org/t/extruded-arc-shape-geometry-not-closing/78435 "2025-02-20T21:33:01Z")\
**Posts on this page:** 1\
**Showing post:** 6

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**Author:** ![prisoner849](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.threejs.org/prisoner849/32/535_2.png) [@prisoner849](https://discourse.threejs.org/u/prisoner849)\
**Post date:** [February 21, 2025, 7:19am UTC](https://discourse.threejs.org/t/extruded-arc-shape-geometry-not-closing/78435/6 "2025-02-21T07:19:08Z")

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A bit late to the party, as usual 🙂  
Bumped into the same issue, building a gear, with gear’s inner hole.

The Gear itself:  
https://codepen.io/prisoner849/embed/preview/zYaZPPw?default-tabs=js%2Cresult&height=300&host=https%3A%2F%2Fcodepen.io&slug-hash=zYaZPPw

The solution was exaclty what @PavelBoytchev said - not to close the path.  
In my case, I simply built a set of points in circular formation, missing the step, where angle is exactly Math.PI \* 2.

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