Display-3D error

[APinho1988]

It's been a while that I am using and updating McSTAS all versions and it's not been possible to use the display 3D tool. No matter what I do, I get this error message:

Traceback (most recent call last):
File "C:\mcstas-3.6.5\bin\../lib/tools\Python\mcdisplay\webgl\mcdisplay.py", line 309, in
main(**args)
~~~~^^^^^^^^
File "C:\mcstas-3.6.5\bin\../lib/tools\Python\mcdisplay\webgl\mcdisplay.py", line 280, in main
write_browse(instrument, raybundle, dirname, instr, timeout, **kwds)
~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\mcstas-3.6.5\bin\../lib/tools\Python\mcdisplay\webgl\mcdisplay.py", line 119, in write_browse
copytree(source.joinpath('dist'), dest)
~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\mcstas-3.6.5\miniconda3\Lib\shutil.py", line 591, in copytree
with os.scandir(src) as itr:
~~~~~~~~~~^^^^^
FileNotFoundError: [WinError 3] O sistema não pode encontrar o caminho especificado: 'C:\Users\alexa\AppData\mcstas\3.6.5\webgl\dist'

For no reason the mcdisplay always get lost and can not project the instrument geometry so I can double check it before running the code! Is there anyone who can help me on that?

[willend]

Hi @APinho1988,

The issue with the current implementation of the webgl solution is that it

1. needs an internet connection on first launch (node.js elements beeing downloaded / built)
2. this process takes some time…

For this reason this dialogue was recently introduced

If you use the tempting menu item Simulation -> Display-3D for this launch, it is however hard to see when the above process is actually over.... And furthermore on Windows seems to hang mcgui, making it tempting to kill it, starting from fresh, meaning that the node.js install process is not over... :-( Having realised that the user experience is this, I will improve on that detail...

In the meantime I recommend that you - armed with patience - try this process:

1. Remove all of your C:\Users\alexa\AppData\mcstas\3.6.5\ folder
2. Launch mcgui and pick an instrument file WITHOUT using the Display-3D shortcut
3. Press Run to start the normal run dialogue
4. Select Trace from the pulldown menu and use ensure to select mcdisplay-webgl

5. Afterwards, the before-mentioned installation dialogue should appear together with a terminal window showing the install process for the node.js stuff...

6. Once successful, your terminal window should contain these last, important lines showing that the vite server is running:

And finally, after sufficiently looooong wait and lots of patience you should get your visualisation:

Now, if the above steps fail you may also try to NOT use mcdisplay-webgl, but opt for mcdisplay-webgl-classic which is admittedly not as fancy but should provide essentially the same information. Access to this is also via the run dialogue:

(I was about to suggest trying to change from webgl to webgl-classic in the mcgui configuration to make Simulation -> Display-3D default to the 'classic' visualiser, but seems not possible as something is hard-coded.... I will also fix this once I get a chance...)

[willend]

@APinho1988 FYI in the next versions onward, the ‘quick-access’ Display-3D will launch webgl-classic...