'SplitWithBreps' puzzling result: different output for points and curves

Grasshopper
1

Hi
I’m using ‘Split with Breps’ for dividing a closed curve with a set of 150 surfaces. It should return 150 open curves, but I got only 149 (and 150 points).
Using another closed curve, the same Split with Breps works fine (150 curves).

CrvSplit_with_Srfs
CrvSplit_with_Srfs958×541 87 KB

CrvSplit_with_Srfs.gh (601.3 KB)

What’s the problem here? Is this depending on the resolution of the model, or what? The closed curves have both some 5000 knots, and no apparent issues.

Also, are there other ways in GH (Rhino ver. 5.4.1 Mac) for achieving this, using perhaps other items? There’s the ‘Surface | Curve’ (which doesn’t work btw.,) but there’s no ‘Curve | Surface’ or ‘Split with Srfs’…

Please note that the set of surfaces is a restrain: using fixed distance, lenght or similar rules for splitting the curve is not an option here…

2

I am using Rhino ver 7.33 Mac.

The results from the Split With Breps vary depending on document tolerance. I get expected results with tolerance set to 0.001

Results from Brep / Curve seem to be more consistent regardless of document tolerance.

splitcrv01
splitcrv011134×1072 111 KB

splitcrv02
splitcrv021134×1072 112 KB

splitcrv03
splitcrv031134×1072 112 KB

splitcrv04
splitcrv041134×1072 112 KB

CrvSplit_with_Srfs_re01.gh (619.6 KB)

You could use the points from Brep / Curve to split your curves.

shatter curves
shatter curves1426×1072 112 KB

CrvSplit_with_Srfs_re02.gh (618.8 KB)

-Kevin

3

Brilliant!
Nice & smooth solution, Kevin.
Really appreciated!!

Btw: in some other model the Brep / Curve generated a wrong amount of points, too.
So it’s definitely a matter of resolution, and yes - Brep / Curve performs generally better than Split with Breps…