Build a Curve on a model through two Point3D

Rhino Developer
1

Is there any built-in function for building a curve connecting two points (Point3D) on the same Brep ?(guarantee that these the BrepFace connecting these two points exist)

image_2023_04_04T09_26_09_791Z
image_2023_04_04T09_26_09_791Z961×491 43.3 KB

Connecting these two blue points through the yellow line.

2

You can create a line curve between the two points and project it to the brep.

1 Like
3

Thanks, I will give the code to anyone interested, I also added trimming to only get the curve limited by my two points.

Vector3d v = new Vector3d(upperPoint.X - lowerPoint.X,
                        upperPoint.Y - lowerPoint.Y,
                        0);
LineCurve freeSpaceCurve = new LineCurve(upperPoint, lowerPoint);
Curve[] builtCrvs = Curve.ProjectToBrep(freeSpaceCurve, brep, v, doc.ModelAbsoluteTolerance);

if (builtCrvs.Length>0)
{
    // Get and trim curve
    Curve crv = builtCrvs[0];

    crv.ClosestPoint(upperPoint, out double crvStartParam);
    crv.ClosestPoint(lowerPoint, out double crvEndParam);
    if (crvEndParam < crvStartParam)
    {
        double temp = crvStartParam;
        crvStartParam = crvEndParam;
        crvEndParam = temp;
    }

    Interval trimInterval = new Interval(crvStartParam, crvEndParam);
    crv = crv.Trim(trimInterval);
}