# Error surface triangular edges sandbox tool

**URL:** <https://forums.sketchup.com/t/error-surface-triangular-edges-sandbox-tool/350998>\
**Category:** SketchUp\
**Tags:** edges, tools\_on\_surface\
**Created:** [October 27, 2026, 5:00pm UTC](https://forums.sketchup.com/t/error-surface-triangular-edges-sandbox-tool/350998 "2026-10-27T17:00:21Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![goyatea](https://avatars.discourse-cdn.com/v4/letter/g/bc8723/32.png) [@goyatea](https://forums.sketchup.com/u/goyatea)\
**Post date:** [October 27, 2026, 5:00pm UTC](https://forums.sketchup.com/t/error-surface-triangular-edges-sandbox-tool/350998/1 "2026-10-27T17:00:21Z")

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Hello, I am using the Sandbox tool to create a surface. As you can see, there are still some issues with the surface, such as strange triangular edges. Even when I use the soften edges tool, the result is not smooth.

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**Author:** ![panixia](https://sea2.discourse-cdn.com/sketchup/user_avatar/forums.sketchup.com/panixia/32/48788_2.png) [@panixia](https://forums.sketchup.com/u/panixia)\
**Post date:** [October 27, 2026, 6:24pm UTC](https://forums.sketchup.com/t/error-surface-triangular-edges-sandbox-tool/350998/2 "2026-10-27T18:24:38Z")

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Select those contours and use this button instead of sandbox.

 ![image](https://global.discourse-cdn.com/sketchup/original/4X/e/f/5/ef54e3ee302ad37a32a2a79214cefa6aadfd74e1.jpeg)