public void GeometryUtil_breakMany_pointsOK()
{
Vector3 pt1 = new Vector3(6, 8, 1);
Vector3 pt2 = new Vector3(3, 4, 1);
var line = new Line3(pt1, pt2);
double len = pt1.DistanceTo(pt2);
double spacing = .1;
int count = (int)(Math.Round(len / spacing)) + 1;
List <IVector3> points = line.BreakMany(spacing);
Assert.AreEqual(count, points.Count);
double seglen = points[0].DistanceTo(points[1]);
Assert.AreEqual(spacing, seglen, .01);
}