test if point is on curve

Replies to This Discussion

Permalink Reply by Giulio Piacentino on September 23, 2010 at 7:40am

Hi Christoph,

nice to see you again!
The GH_Point class is a Grasshopper point, which is a container for points and not the "real" point.
This is the content of a scripting component: private void RunScript(Curve x, Point3d y, ref object A)
{

  //We only use this method if there is a curve
  if(x != null)
  {
    //"t" is the parameter on the curve
    double t;

    //A is assigned true if closest point to y is within tolerance,
    //otherwise it will be assigned false, and t will not be calculated
    A = x.GetClosestPoint(y, out t, doc.ModelAbsoluteTolerance);
  }

}

I hope this is helpful,

- Giulio

Attachments:

• isOnCurve.ghx, 27 KB

Permalink Reply by Christoph Degendorfer on September 23, 2010 at 10:33am

Thank you!!
this helps a lot,

Christoph

Permalink Reply by Chris on April 21, 2015 at 3:45am

Hello Giulio,

I try to use the definition, but the outcome is null.

Any idea what might be going wrong?

Chris

Permalink Reply by Giulio Piacentino on April 21, 2015 at 4:06am

Hi Chris

this is an updated component with upgraded code.
Now the GetClosestPoint() call in RhinoCommon changed to:

x.ClosestPoint(y, out t, doc.ModelAbsoluteTolerance)

The attached file also shows a Grasshopper-only approach to this.

Giulio
--
Giulio Piacentino
for Robert McNeel & Associates
giulio@mcneel.com

Attachments:

• isOnCurve.ghx, 59 KB

Permalink Reply by Chris on April 22, 2015 at 2:11am

Thank you Giulio

Permalink Reply by Hojat11 on March 2, 2017 at 10:53am

hey Giulio , your component is for one cure. what about we have several curve and several point to test?

Permalink Reply by Giulio Piacentino on March 2, 2017 at 12:08pm

Grasshopper can handle several curves and several points with the same component. It's a question of how the data structure looks like. You can read the section on Data Trees to understand this better, inside the GH 101 Manual.