# Intersections between circles

Hello all,
Please, I’m trying to write a script that checks for the intersection between inclined circles on Rhino and calculates the length. I tried using curvecurveintersection, but it’s always returning no intersection, wvwn when the circles are intersected.

NB: my circles are guid objects I inserted in a box, then saved the GUIDs in a list, so I want to use the list to find intersection between the circles

Can you post some code with a sample file that’s not working?

Blockquote

``````> def LengthOfIntersection(circle_list):
>     length = 0
>     print circle_list
>     for i in range(len(circle_list)):
>         curveA = circle_list[i]
>         for j in range(len(circle_list)-1):
>             if j != i:
>                 intersection = rs.CurveCurveIntersection(curveA,circle_list[j])
>                 #print intersection
>                 if intersection != None:
>
>                     length += math.sqrt((intersection-intersection)**2 + (intersection-intersection)**2)``````

The circle_list is a list of GUIDs

I have now converted the circles into surfaces for the intersections to be detected. But I am getting a weird error

``````def LengthOfIntersection(surface_list):
length = 0
for i in range(len(surface_list)):
curveA = surface_list[i]
for j in range(len(surface_list)):
if j != i:
intersection = rs.CurveCurveIntersection(curveA,surface_list[j])
#print intersection
if intersection != None:
``````
``````                length += math.sqrt((intersection-intersection)**2 + (intersection-intersection)**2)
else: continue
print length
``````

Message: unable to convert ef49509a-0bb4-46d9-b03d-e966960c84e2 into Curve geometry

Traceback:
line 1447, in CurveCurveIntersection, “C:\Users\falol\AppData\Roaming\McNeel\Rhinoceros\6.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rhinoscript\curve.py”
line 1002, in coercecurve, “C:\Users\falol\AppData\Roaming\McNeel\Rhinoceros\6.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\rhinoscript\utility.py”
line 171, in LengthOfIntersection, "C:\Users\falol\AppData\Roaming\McNeel\Rhinoceros\6.0\scripts\sec.

This is the function generating and converting the circles to surfaces.

``````def AddCircle(n,radius,boxlength):
"""
A function to add a fixed number of circles in a cube
"""
#initialize a list to store circle GUIDs
circle_list = []
surface_list = []
#a loop to insert the fixed number of circles
for i in range(n):
#create a center point for the circle