Lost list order when Unroll surface with geometries

[stefano.arrighi]

I noticed that if you unroll multiple geometries together with a surface, the original items order is lost.
I tried with multiple unroller but the result is the same. Probably because they all call the same rhinoscriptsyntax.UnrollSurface command?
Am I missing something?unrollTest.gh (13.1 KB)

[Jack_Young]

That seems to be a common bug. This thread has a few answers:

Number of points

Hello friends Why the number of points has shifted after offset. cover.gh (27.0 KB)

Otherwise you could try resorting points with ‘sort points along curve’, using the boundary curve with the seam aligned to the corner nearest the origin (to make sure the ordering doesn’t start in the middle).

[dale (Dale Fugier)]

Adding geometry to unroller - does it retain same order?

For the AddFollowingGeometry method in the Unroller class I’m experiencing some issues with the order of curves after unrolling. I currently create 2 different arrays which will be processed differently after unrolling and add them to the unroller one by one. After unrolling using this this method I end up with an array of all curves which I thought would be returned in the same order (so I can split them up into 2 arrays again) but it seems like it doesn’t? Is there a way to return the correc…

[stefano.arrighi]

Thanks for the reply!
I would like to avoid to re-organize the list after the unrolling based on proximity or other geometrical parameters.
@dale Output the initial indices would work perfectly but does the Unroller.FollowingGeometryIndex method work for points as well?

[Joseph_Oster]

@Jack_Young

That seems to be a common bug.

It’s a common condition though not necessarily a bug. The same thing happens when splitting surfaces or breps. There is no logical correlation between the sequence of cutters and sequence of results so sorting and sifting them by geometric criteria (position, area, length, etc.) is very common.

[stefano.arrighi]

I´ve somehow managed to get what I wanted copy pasting from the SampleUnroller.py.
and convert the input points into TextDots in order to use Unroller.FollowingGeometryIndex method.

Now…does someone know why using the newest Python component for RH7 I have no output for
the unrolled Breps?

thanks!

210930_Unroller.gh (12.5 KB)

[Willem (Willem Derks)]

@stefano.arrighi

does the Unroller.FollowingGeometryIndex method work for points as well?

AFAIK the unroller does not index points.
My workaround has been to pass points by means of textdot, as they are indexed. After tye unroll I used the unrolled point as result for the 3D points