curve self intersect not working correctly

Replies to This Discussion

Permalink Reply by Daniel González Abalde on October 6, 2015 at 10:05am

It's strange, a fast solution would be this.

Permalink Reply by Riccardo Majewski on October 6, 2015 at 10:21am

Eh... that's something.

But i would like keep original curves.

I mean, it's just 1 arc + 2 lines.

Rebuilding make everything a nurb-curve, its closest point to original would not be perfect, and i cannot get 2 parameters for each intersection to shatter the curve.

This bug is happening often in my definition (trying to make a new offset component), and i would like to keep an arc as an arc and a line as a line.

Just... it works with curve-curve but not curve-self ... 

Who know what's happening inside the code. :D

Maybe a c# alternative?

Permalink Reply by Daniel González Abalde on October 6, 2015 at 11:09am

If I were you I would do this.

As far as I touch these intersections, the result in this test code are four equal points.

Dim events = rhino.Geometry.Intersect.Intersection.CurveSelf(Crv, 0.00001)
Dim pts As New list(Of point3d)
For Each ev As rhino.Geometry.Intersect.IntersectionEvent In events
pts.add(ev.PointA)
pts.add(ev.PointA2)
pts.add(ev.PointB)
pts.add(ev.PointB2)
Next
A = pts

These strange things often occur when working with polycurves (lines+curves), the offset also often fails with this type of curve....

Permalink Reply by Marco Ochian on December 2, 2019 at 11:00am

I have a similar problem, this time regarding a set of curves. The crvs are contour of a mesh. They intersect in Rhino resulting points, but not in grasshopper. Why? What can I do to get the script right. Thanks you!

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