Polyline Direction

[Jenil_Shah]

Hi,
Any idea how we can sync or manually change the direction of multiple polylines?

[Artstep]

Flip should work on multiple objects?

[Jenil_Shah]

It works for Symmetrical objects but for Asymmetrical ones, not the best solution I guess…
This creates a problem when Listing points in Grasshopper

[martinsiegrist]

Are the polylines closed?

[Jenil_Shah]

Yes, Closed polylines…

[martinsiegrist]

So you can put a little circle inside every polyline and use it as a guide curve for the flip component

[Jenil_Shah]

Uhmm, Couldn’t get it exactly, sharing the file, in incase I am solving it incorrectly…
Thanks
Direction issue.3dm (89.7 KB)

[martinsiegrist]

Sorry, the command is _MatchCrvDir. However it doesn’t seem to work consistently.

The approach with the circle is for Grasshopper.

[Jenil_Shah]

Yes, true… How can I do it in Grasshopper? The major problem is with asymmetrical objects

[martinsiegrist]

flip_curves.gh (11.9 KB)

[Jenil_Shah]

The result after baking the geometry is still the same…

[martinsiegrist]

What did you bake?

[Jenil_Shah]

Tried Baking Flip component and offset as well… Same results

[martinsiegrist]

It works fine here. Please post your Grasshopper file.

[Jenil_Shah]

Sure, Attached below

flip_curves_with point lists.gh (13.1 KB)
Direction issue.3dm (118.1 KB)

[martinsiegrist]

What did you bake?

[Jenil_Shah]

The flip curve component’s output

[martinsiegrist]

Weird, but you agree that the cones on the offset boundary all point into the same counter clockwise direction ?

[Jenil_Shah]

Yes they are in a clockwise direction. So I suppose you tried baking the flip component and the ShowDir command in Rhino shows all the polyline directions synced, correct?

[martinsiegrist]

This is the result I get, baking the flip curve component.

Direction is counter clockwise. All adjacent edges have opposing directions.

original_vs_baked_dir.gh (16.9 KB)

I do not like and never use the showdir display.