Direction toward the inside boundary of a surface?

[glenncai]

Is there any node that allows me to always get the direction toward the inside boundary of a surface or a close loop? Thanks

[Tomasz]

Offsetting closed PolyCurve with negative value should move lines inside the shape.

If this somehow fails - you can offset face perimeter in both directions and take the smaller one.

[glenncai]

Thanks for your reply Tomasz
Yes, input a negative number works, but it only work when offset the close loop. but what about just offset the edge I picked?

[Dimitar_Venkov]

Offsetting lines tends to be very inconsistent. The below example is not very straight-forward but the Geometry.Translate node seems to be she surest way:

[Tomasz]

Something like this?

[glenncai]

This is Awesome