Hi guys,

For my project, I am trying to make a bed of spheres, which are connected to other(s) if the gap between them is smaller than a certain distance.

gap = rs.Distance(point1, point2) - radius1 - radius2;

tolerance = 0.050

val = gap/radius

if val <= tolerance, the connection shall be formed

The connecting structure between two spheres is a cylinder, whose radius is 0.08 times the radius of the sphere. Sphere radii are all uniform and a sphere could have more than one cylinder connection if the criteria are met. The illustration of the connection is given in the following figure.

In order to do that, I made the following Python code:

```
import rhinoscriptsyntax as rs
import math as math
def isclose(a, b, rel_tol=1e-09, abs_tol=0.0):
return abs(a-b) <= max(rel_tol * max(abs(a), abs(b)), abs_tol)
# determination of particle bridge is given as follows
def isConnected(point1, point2, radius1, radius2):
gap = rs.Distance(point1, point2) - radius1 - radius2;
tolerance = 0.050
val = gap/radius
return (isclose(val, tolerance) or (val < tolerance))
radius = 10.0
points = []
points.append([3.8004, -10.7703, -14.7366])
points.append([6.89814, 9.90892, -14.7361])
points.append([-14.1991, -1.3038, -14.7362])
points.append([-2.50297, -1.28871, 1.70578])
points.append([12.3037, -17.4367, 2.09313])
points.append([21.1603, -2.79959, -8.81348])
points.append([-11.5506, -18.1149, -4.23054])
points.append([-11.1571, 18.5256, -14.736])
points.append([4.63671, 21.0576, 1.71328])
points.append([-19.803, 8.74576, 1.62201])
points.append([19.4772, 8.88409, 7.33124])
points.append([19.7547, -8.05903, 18.1097])
points.append([8.40554, -19.6233, 29.834])
points.append([19.879, 7.92851, 30.1251])
points.append([4.80376, 21.0154, 28.916])
points.append([-14.0158, -14.7737, 29.5774])
points.append([-19.7362, -8.70016, 11.4009])
points.append([-3.47392, -21.1316, 13.8154])
points.append([-20.8642, 5.75207, 25.1795])
points.append([3.10321, 2.98932, 20.421])
points.append([-9.83524, 19.2703, 15.4012])
points.append([-21.4772, -2.41992, 43.4234])
points.append([19.6639, -8.27222, 41.8506])
points.append([-12.3412, 17.7824, 38.6932])
points.append([-2.90253, 21.4069, 55.9492])
points.append([-0.923667, 0.666779, 39.873])
points.append([-3.82574, -21.0765, 45.5909])
points.append([14.4364, 15.8948, 47.644])
points.append([-7.73744, -5.57666, 57.6097])
for i in range(len(points)):
rs.AddSphere(points[i], radius)
rs.AddPoint(points[i], radius)
#forming connections
for i in range(len(points)):
for j in range(i+1, len(points)):
if (isConnected(points[i], points[j], radius, radius)):
rs.AddCylinder(points[i], rs.Distance(points[i], points[j]), 0.08 * radius, cap=True)
```

However, the structure generated by Rhino is not what I hope for:

Instead of connecting two center points of spheres, the cylinders are just formed vertically out of the core in rather random manner. I don`t know what`

s wrong with my coding, could somebody help me to fix it? Thanks in advance.