Point inside area

Replies to This Discussion

Permalink Reply by Eirik K on January 19, 2011 at 8:59am

Hi Brian. Did you ever find a way?

 

I'm trying to get the curvature of a point on a curve, if this point is inside a given area.

 

It doesn't really seem to work? Where is my error?

 


private void RunScript(Curve curve, Surface surface, ref object A)
{
// border to check if inside
Brep border = Brep.CreateFromSurface(surface);

// return list
List
test = new List
();

// divide curve
double[] divisions = curve.DivideByCount(100, true);

for(int i = 0; i < divisions.Length; i++)
{
Point3d examine = curve.PointAt(divisions[i]);
Vector3d curvature = curve.CurvatureAt(divisions[i]);

if(border.IsPointInside(examine, RhinoMath.SqrtEpsilon, false))
test.Add(new Line(examine, curvature));

}
A = test;
}

 

Eirik Kjølsrud

Permalink Reply by Eirik K on January 19, 2011 at 9:07am

when I read the SDK

Determine if a 3D point is inside of a brep. This function only makes sense for closed manifold Breps.

It seems as though this function might not be the correct one to determine whether a point is found on a surface? Any better?

Permalink Reply by Eirik K on January 19, 2011 at 9:46am

Would the BrepEdge.Contains(Point3d) do the trick?

 

How to get from a surface to a BrepEdge then? ...

Permalink Reply by Daniel Davis on January 19, 2011 at 6:56pm

Assuming the point and the curve are on a 2d plane. Draw a line from the point in any direction, making sure it extends outside the boundary of the curve. Then count the number of times the line and the curve intersect. If the number of intersections is odd, then the point is inside the curve, if the number of intersections is even (or 0), then the point is outside the curve.

Permalink Reply by RG on January 20, 2011 at 3:48am

Hi,

You need to have a gap between the point and the brep, they can't do co-planar.

 

Regards,

Permalink Reply by Fred P on January 16, 2013 at 10:10am

Hello,

There is now the fonction " Containment" !

You can found it in Curve> analysis

Regards

fred