Topic: Checking for Perpendicular

[nobody]

Maybe I'm just tired but shouldn't this return true if my two points are perpendicular to the polyline?

Code - C#: [Select]

1.      private static bool ninetycheck(Point3d pt1, Curve curve)
2.         {
3.             Editor MyEditor = Application.DocumentManager.MdiActiveDocument.Editor;
4.  
5.             Matrix3d mat = MyEditor.CurrentUserCoordinateSystem;
6.             Point3d basept = pt1.TransformBy(mat);
7.             Point3d pt = curve.GetClosestPointTo(basept, false);
8.             Vector3d v3d = basept.GetVectorTo(pt);
9.             Vector3d derv3d = curve.GetFirstDerivative(pt);
10.             if (v3d.IsPerpendicularTo(derv3d))
11.             {
12.                 return true;
13.             }
14.        

[MickD]

Just flying past with a quick thought...

Have you tried normalising the vectors first?

[nobody]

Just flying past with a quick thought...

Have you tried normalising the vectors first?

Thanks Mick...will give that a shot

[Bryco]

And add a tolerance