Unexpected behaviour of offset tool

[cotty]

Does anyone have a tip how to do this offset without the "error" in left corner or whats the reason for this?
Thank you!

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[Rich O Brien]

Try Fredo's Tools on Surface Offset Tool

This is a common result with the native tool

[Gaieus]

I remember seeing a plugin that aims to eliminate this issue but for my life I cannot remember which it was. Searching the plugins index did not get any results. Tools on surface (the plugin) has some solutions (simplify contour) but then sometimes introduces other issues.

[TIG]

Native Offset can't compute a suitable outline if there are reentrant or spiky forms - here's a way to fix it afterwards...Fredo's ToolsOnSurfaceOffset is better than the Native tool BUT it's still not perfect - the same fix can be applied to the results from that if it messes up...

[Jim]

Maybe draw the inner shape first, then offset outwards.

[Gaieus]

Well, I can also redraw (and this is the way I usually fix it, too) but certainly an improved offset tool would be great.

[cotty]

Thank you for yur helpful tips! It's a pity that this relatively simple action is not done correctly with the native tool, because it will often confuse beginners...