Curve.contains(Point3d)

I am using the following function to figure out if a Point is within a boundary area and outside an obstacle, mostly it works as expected but in some cases it doesn't:

Private Function Inside(ByVal Obstacle As List(Of Curve), _
ByVal Boundary As Curve, _
ByVal p As Point3d, _
Optional ByVal dt As Double = 0) _
As Boolean

Dim t As Double

If Boundary.Contains(p) = PointContainment.Outside Then
Return False
ElseIf dt > 0 Then
Boundary.ClosestPoint(p, t)
If p.DistanceTo(Boundary.PointAt(t)) < dt Then
Return False
End If
End If

For Each c As Curve In Obstacle
If c.Contains(p) = PointContainment.Inside Then
Return False
ElseIf dt > 0 Then
c.ClosestPoint(p, t)
If p.DistanceTo(c.PointAt(t)) < dt Then
Return False
End If
End If
Next

Return True
End Function

I have moved it to a VB Script node and found out that for a point that is miles within the boundary the function Curve.contains(P) returns that it is outside. (see image e.g. cell 4079) Any suggestions?

Best Richard

Replies to This Discussion

Permalink Reply by David Rutten on April 4, 2014 at 7:15am

Hi Richard,

any chance of getting the files needed to replicate this?

David Rutten

david@mcneel.com

Permalink Reply by Richard Schaffranek on April 4, 2014 at 8:59am

Attached a file, would need to install SpiderWeb that is why I didn't include it at the beginning...

Attachments:

TEST.zip, 19 KB

Permalink Reply by David Rutten on April 4, 2014 at 10:21am

I get a whole bunch of wrong answers when using Curve.Contains.

For some reason the [Point In Curve] component gets it right, even though it eventually uses the same method. I haven't been able to figure out why yet.

David Rutten

david@mcneel.com

Permalink Reply by Richard Schaffranek on April 11, 2014 at 6:09am

Any suggestion for an other methode? like limiting it to polylines or ... ?

Permalink Reply by David Rutten on April 12, 2014 at 2:01am

Sorry, I'm on the road at the moment, I'd go for bitmap pixel testing since it's a nice squareish curve. I can do some testing once I'm back home on monday.

Permalink Reply by Richard Schaffranek on April 12, 2014 at 12:17pm

Hmm, that want do need a general solution and not a specific...

its not such a hurry was just wondering.

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