Find the inner and outer contour of a set of points

Hi again @marcomusy. I have a set of points that I want to find the inner and outer contour of these points. This means the inner and outer contour of the red points below. The points order aren’t organized. This is so I can compute the deviation between the outer and inner contour to the blue lines. I have tried to reconstruct a surface of the points with recoSurface(pts), and tried to find the boundaries of the mesh, but I didnt suceed since the mesh was so coarse for my points. Also creating the surface with delauney2d. I have tried to reconstruct the same issue with some code below. In advance, thank you!

from vedo import *

cyl1  = Cylinder(pos=(0,0,0), r=2, height=4, axis=(1,0,0), alpha=.5, cap=0, res=100).triangulate()
cyl2 = Cylinder(pos=(0,0,2), r=1, height=3, axis=(0,0.3,1), alpha=.5, cap=0, res=100).triangulate()
cyl3 = Cylinder(pos=(0,0,2), r=1.1, height=3, axis=(0,0.3,1), alpha=.5, cap=0, res=100).triangulate()
intersect_1 = cyl1.intersectWith(cyl2).join(reset=True).c('b')
intersect_2 = cyl1.intersectWith(cyl3).join(reset=True).c('b')
#show(cyl1,cyl2,cyl3, intersect_1, intersect_2).close()

#Trying to cut out the the surface between the two intersect lines
surf = cyl1.clone()
surf.cutWithMesh(cyl3, invert= True) #These two lines doesn't work for me, to cut out the section between cyl2 and cyl3? Have I done it wrong?
surf.cutWithMesh(cyl2, invert= True) # I tried using the cutWithCylinder also, instead of mesh, but the cut did end up with the same as cutWithMesh. An empty mesh.
show(surf,cyl2, cyl3).close()

#when figuring what I have done wrong with cutWithMesh, extract the points of the surf and find the countour. Maybe randomize the order of the points.
pts = v.Points(surf.points())

#find a way to find the inner and outer contour?

[eivindtn]

I understand. As always, gratitude for the fast response!

[marcomusy]

…well it gives everything including the scaling, if you set rigid=True then this scaling should be one.