/// <summary>
/// Build a vector from the two pints, scale the vector with the desired value
/// and calculate a transformation applied on the first point to generate where
/// the second point should be.
/// </summary>
public static Point3D ScaleSegment(Point3D point1, Point3D point2, double scale)
{
var vector = new gpVec(point1.GpPnt, point2.GpPnt);
vector.Scale(scale);
var transformation = new gpTrsf();
transformation.SetTranslation(vector);
// Apply the transformation on the vertex
return(new Point3D(point1.GpPnt.Transformed(transformation)));
}