Calling Grasshopper from external app - GH Python Remote & Rhino 8

Rhino Developer
,
1

I had an external app that called a grasshopper user object in order to export some geometry & data based on different inputs. This was working ok in Rhino 7 but now I am working in Rhino 8, it just does not work. Is there no support for GH Python Remote in Rhino 8??

My python script (external) was something like this:

def export_geometry(x1, x2, x3, x4, x5, x6, x7, x8, x9):
    ROOT = path.abspath(path.dirname(inspect.getfile(ghpythonremote)))
    rpyc_server_py = path.join(ROOT, "ghcompservice.py")
    with PythonToGrasshopperRemote(
        None, rpyc_server_py, rhino_ver=7, timeout=500
            ) as py2gh:
        rghuo = py2gh.gh_remote_userobjects
        export = rghuo.user-object(x1, x2, x3, x4, x5, x6, x7, x8, x9)

where user-object was the name of a saved user object and x1, x2 … the inputs to the user object.
The error I am getting if trying in Rhino 8 is “no module named ghpythonremote”
Any help to make this work in Rhino 8?

2

@pierrec maybe you can help or comment??

3

Have you installed GHPythonRemote in Rhino 8? You need to give it an explicit path during the installation step, the latest version will only look for Rhino 7 installations and earlier:

python -m ghpythonremote._configure_ironpython_installation "%APPDATA%\McNeel\Rhinoceros\8.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib"

If there is any error at the end of this step, it is not fully installed and will likely not work.

In general, all of this should still work in Rhino 8 just like it worked in Rhino 7, but I only provide very limited support at this point. There are better ways of calling Rhino and Grasshopper functions from Python in version 8, including Rhino.Compute and Rhino.Inside CPython.

4

Going through the installation instructions and adapting for Rhino 8, I can run all of the example file CPython_to_GH.py. That includes calling a User Object and getting its result (15 here).

(ghpyremote) pierre@PierreProArt16:/$ python "C:\Users\pierre\AppData\Roaming\McNeel\Rhinoceros\8.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\gh-python-remote\examples\CPython_to_GH.py"
INFO: ghpythonremote.connectors:
Connecting...
DEBUG: ghpythonremote.connectors:
Connecting. Timeout in 60 seconds.
DEBUG: ghpythonremote.connectors:
Connecting. Timeout in 59 seconds.
DEBUG: ghpythonremote.connectors:
Connecting. Timeout in 58 seconds.
DEBUG: ghpythonremote.connectors:
Connecting. Timeout in 57 seconds.
DEBUG: ghpythonremote.connectors:
Found connection, testing. Timeout in 56 seconds.
DEBUG: ghpythonremote.connectors:
Found connection, testing. Timeout in 55 seconds.
DEBUG: ghpythonremote.connectors:
Found connection, testing. Timeout in 54 seconds.
DEBUG: ghpythonremote.connectors:
Found connection, testing. Timeout in 53 seconds.
DEBUG: ghpythonremote.connectors:
Found connection, testing. Timeout in 52 seconds.
DEBUG: ghpythonremote.connectors:
Connection ok, returning.
INFO: ghpythonremote.connectors:
Connected.
8958.4515789
15
INFO: ghpythonremote.connectors:
Closing connection.
INFO: ghpythonremote.connectors:
Closing Rhino.

Note the changes in that example file provided with the GH Python Remote installation:
line 30: rhino_ver=7 to rhino_ver=8
line 59: rghuo.TestClusterGHPythonRemote to rghuo.TestClusterGHPR
I also had to install the test User Object from %APPDATA%\McNeel\Rhinoceros\8.0\Plug-ins\IronPython (814d908a-e25c-493d-97e9-ee3861957f49)\settings\lib\gh-python-remote\examples\TestClusterGHPR.ghuser to the Grasshopper User Objects folder.

Please let me know if you get stuck somewhere with your scripts, tell me how you got there, and I’ll see if I can fix that.