# Feature request - MatchSrf to preserve isocurve direction

**URL:** <https://discourse.mcneel.com/t/feature-request-matchsrf-to-preserve-isocurve-direction/223123>\
**Category:** Rhino\
**Tags:** mac\
**Created:** [September 29, 2026, 7:40pm UTC](https://discourse.mcneel.com/t/feature-request-matchsrf-to-preserve-isocurve-direction/223123 "2026-09-29T19:40:24Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Lagom](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/lagom/32/767418_2.png) [@Lagom](https://discourse.mcneel.com/u/Lagom)\
**Post date:** [September 29, 2026, 7:40pm UTC](https://discourse.mcneel.com/t/feature-request-matchsrf-to-preserve-isocurve-direction/223123/1 "2026-09-29T19:40:24Z")

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**MatchSrf** a natural surface edge on the right to a trimmed edge on the left with G1 or G2 continuity modifies the isocurves of the right surface, despite selecting _Preserve isocurve direction_.

 ![Untitled-39](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/b/c/8/bc8936ef0123183479d890e92e1cdf3d787aa0dc.png)  
 ![Untitled-40](https://global.discourse-cdn.com/mcneel/uploads/default/original/4X/a/a/4/aa41f229bb42771d0ef318a3c09fef793151555f.png)

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**Author:** ![Gijs](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/gijs/32/769882_2.png) [@Gijs](https://discourse.mcneel.com/u/Gijs)\
**Post date:** [September 29, 2026, 9:04pm UTC](https://discourse.mcneel.com/t/feature-request-matchsrf-to-preserve-isocurve-direction/223123/2 "2026-09-29T21:04:43Z")

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thanks, logged as [RH-99128](https://mcneel.myjetbrains.com/youtrack/issue/RH-99128) Preserve isocurve direction doesn’t work

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<div class="post-metadata">

**Author:** ![Lagom](https://sea3.discourse-cdn.com/mcneel/user_avatar/discourse.mcneel.com/lagom/32/767418_2.png) [@Lagom](https://discourse.mcneel.com/u/Lagom)\
**Post date:** [October 16, 2026, 9:17pm UTC](https://discourse.mcneel.com/t/feature-request-matchsrf-to-preserve-isocurve-direction/223123/3 "2026-10-16T21:17:20Z")

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Just for the record, it also doesn’t work when **MatchSrf** with the _On Surface_ option is used.