# The curvature of a three-dimensional surface asks for help

**URL:** <https://community.freefem.org/t/the-curvature-of-a-three-dimensional-surface-asks-for-help/2912>\
**Category:** General Discussion\
**Created:** [January 26, 2024, 4:04pm UTC](https://community.freefem.org/t/the-curvature-of-a-three-dimensional-surface-asks-for-help/2912 "2024-01-26T16:04:47Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Tan](https://avatars.discourse-cdn.com/v4/letter/t/f07891/32.png) [@Tan](https://community.freefem.org/u/Tan)\
**Post date:** [January 26, 2024, 4:04pm UTC](https://community.freefem.org/t/the-curvature-of-a-three-dimensional-surface-asks-for-help/2912/1 "2024-01-26T16:04:47Z")

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I wonder how to find the curvature of a surface in 3D? I have only seen the way to solve curves in 2D cases in the documentation, and it is wrong for me to apply it to 3D to solve the curvature of the surface, can you briefly introduce it.

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**Author:** ![frederichecht](https://yyz2.discourse-cdn.com/flex030/user_avatar/community.freefem.org/frederichecht/32/15_2.png) [@frederichecht](https://community.freefem.org/u/frederichecht)\
**Post date:** [January 31, 2024, 9:40am UTC](https://community.freefem.org/t/the-curvature-of-a-three-dimensional-surface-asks-for-help/2912/2 "2024-01-31T09:40:06Z")

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First which curvature : Gass or mean curvature and to do what!