GH Explode Curve does not work like the Rhino explode

Hello,

GH Explode Curve does not work like the Rhino explode. GH explodes in too many parts. I tested an alternative with the function Discontinuity, but a function to split curves by points does not exist.

Is there a GH function or a method that works like the Rhino Explode?

Cheers,

Bas

Attachments:

ExplodeCurve.gh, 260 KB

Replies to This Discussion

Permalink Reply by Andrew Heumann on December 16, 2016 at 7:21am

the "function to split curves by points" you want is called "Shatter" - just provide the t parameters at which you want to split the curves (both CCX and Discontinuities will return the t parameters as an additional output).

Permalink Reply by Bas Goris on December 16, 2016 at 7:54am

Thanks for this answer. This is something I could not have guessed.

Different Rhino and Grasshopper naming for the same thing or does it work differently?

Permalink Reply by David Rutten on December 16, 2016 at 8:30am

Did you set the Recursive input to false?

Permalink Reply by Bas Goris on December 18, 2016 at 4:48am

Dear David,

Yes, I did as you can see below. In the ships bulbous bow one can see that the curves are exploded at more points, while after baking in Rhino, Rhino says that it can not explode a single curve.

With the Recursive input on it gives even more subcurves as you can see below.

Permalink Reply by David Rutten on December 16, 2016 at 8:32am

As for split-by-points, since most points* are not on the curve, you have to split by curve parameters instead. The [Shatter] component allows you to split a curve into subcurves by providing the splitting parameters. If you have points on or near the curve at which you want to split, you must first figure out which parameters on the curve are closest to those points. You can do so with the [Curve Closest Point] component.

* to a first approximation all points.

Permalink Reply by Bas Goris on December 18, 2016 at 4:44am

Dear David,

The Shutter function together with the discontinuity does do the job as I derived the points from the discontinuity function of the same curves.

Bas

Permalink Reply by Bas Goris on December 18, 2016 at 5:45am

Dear David,

I was to quick with my conclusion that it works.

Not all polycurves are 'exploded'.

Hope there is a better solution. The combination of [Discontinuity]-[Curve Closest Point]-[Shutter] does not provide a split at the point where the curves are joined at an earlier stage , at least not for all solutions.

Cheers,

Bas

Permalink Reply by Bas Goris on December 18, 2016 at 6:21am

Hi David,

When I connect the t (Curve parameters at discontinuities) to the t of the Shutter command it works better. (almost the same result as the Rhino Explode.

Permalink Reply by Bas Goris on December 18, 2016 at 8:29am

The green points are of the Discontinuity and the pink points are the results of [Curve Closest Point]-[Shatter].

What I would like to have is a function [Deconstruct PolyCurve].

Permalink Reply by Bas Goris on December 18, 2016 at 9:50am

Hi,

I have found the solution: an extra graft was needed to make the input of the Shatter function (the curves C and the parameters t) at the same branch. Happy me!

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