Description of problem

I tried to plot the morphology described in *User’s guide* by calling the `generate_coordinates`

, but nothing was drawn. Is it necessary to create a ‘whole’ neuron with *eqs* and other objectives just like the example ` bipolar_cell`

? I also added `generate_coordinates`

to the end of ` bipolar_cell`

but no morphology was drawn either.

Minimal code to reproduce problem

```
from brian2 import *
morpho = Soma(diameter=30*um)
morpho.L = Cylinder(length=10*um, diameter=1*um, n=3)
morpho.L1 = Cylinder(length=5*um, diameter=1*um, n=3)
morpho.L2 = Cylinder(length=5*um, diameter=1*um, n=3)
morpho.L3 = Cylinder(length=5*um, diameter=1*um, n=3)
morpho.R = Cylinder(length=10*um, diameter=1*um, n=3)
morpho.RL = Cylinder(length=5*um, diameter=1*um, n=3)
morpho.RR = Cylinder(length=5*um, diameter=1*um, n=3)
new_morpho = morpho.generate_coordinates()
show()
```

What you have aready tried

Adding `new_morpho = morpho.generate_coordinates() `

to the example ` bipolar_cell`

to see whether it works.

Expected output (if relevant)

A similar output should be like this (in User’s guide):

Actual output (if relevant)

Nothing was drawn