# Ignore: Request - Single Span Arc

**URL:** <https://discourse.mcneel.com/t/ignore-request-single-span-arc/214981>\
**Category:** Rhino\
**Tags:** windows, arc\
**Created:** [January 24, 2026, 12:31am UTC](https://discourse.mcneel.com/t/ignore-request-single-span-arc/214981 "2026-01-24T00:31:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![davidcockey](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/davidcockey/32/771921_2.png) [@davidcockey](https://discourse.mcneel.com/u/davidcockey)\
**Post date:** [January 24, 2026, 12:31am UTC](https://discourse.mcneel.com/t/ignore-request-single-span-arc/214981/1 "2026-01-24T00:31:30Z")

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**UPDATE: Somehow Arc is now creating single span curves for me. Not sure why or what change. Ignore this request.**

Request: Arc command create single span curves unless the math requires multiple spans.

The Arc command creates a curve with a minimum of two spans, even when the angle of the arc is one third of a circle or less and a single span rational NURBS curve could be used. (Larger angles require multiple spans.) The superfluous knot results in unneccessary complexity in surfaces, etc created using arcs.

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**Author:** ![Rhino\_Bulgaria](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/rhino_bulgaria/32/505284_2.png) [@Rhino\_Bulgaria](https://discourse.mcneel.com/u/Rhino_Bulgaria)\
**Post date:** [January 24, 2026, 3:30am UTC](https://discourse.mcneel.com/t/ignore-request-single-span-arc/214981/2 "2026-01-24T03:30:30Z")

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Perhaps that could be automated with a macro for arcs that are 1/4 of a circle or less. I often increase the degree of arcs to 5 degrees to get more control over the shape.