How to interact with open Rhino3D application using Python script

Question

I am currently opening Rhino and running Rhino command lines using subprocess.call() in an external python script.

rhinoPath = "C:\\Program Files (x86)\\Rhinoceros 5\\System\\Rhino4.exe"
rhinoCommandFilePath = "Z:\\Arkangus\\2019\\RhinoCommand.txt"
scriptCall = "_-ReadCommandFile {0}".format(rhinoCommandFilePath)
callScript = '"{0}" /nosplash /runscript="{1}" /runscript="_-Exit"'.format(rhinoPath, scriptCall)
subprocess.call(callScript)

However, it means opening Rhino everytime I am running the script, and closing it after.

Is there a way to check if Rhino is already open and run the RhinoCommand file directly into Rhino if it is the case?

I am not looking for a pipe between Rhino and Python.

Thank you!

have you looked here developer.rhino3d.com/guides/rhinopython? — chris
– chris, Commented Mar 19, 2019 at 10:24
Yes, but if I'm correct rhinopython is to be used within rhino. I was probably not clear enough, I want to run the python script externally from Rhino. — Arkangus
– Arkangus, Commented Mar 19, 2019 at 10:30
Have you seen github.com/mcneel/rhino.inside/tree/master/CPython? It might help. — Luis E. Fraguada
– Luis E. Fraguada, Commented Apr 17, 2019 at 11:58
I had not, thanks for the link! I will take a look. I found compute_rhino3d and rhino3dm meanwhile though, will update my answer accordingly. — Arkangus
– Arkangus, Commented Apr 25, 2019 at 8:43

Arkangus · Accepted Answer · 2019-04-25 08:46:56Z

1

To check if Rhino is already open (Note: this is only a partial answer to my issue):

Checking if program is running programatically

import psutil

def is_rhino_open():
    for pid in psutil.pids():
        p = psutil.Process(pid)
        if p.name() == "Rhino5.exe":
            print ("Rhino5 is running!")

Other way: use Rhino's compute functions directly from within Python (no need to open Rhino) with the CPython3.x modules rhino3dm and compute_rhino3d.

https://discourse.mcneel.com/t/run-script-from-windows-command-prompt-with-open-rhino/80736/2?u=gabriel.taquet

edited Apr 25, 2019 at 8:46

answered Mar 20, 2019 at 13:40

Arkangus

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