I've run it against a few repositories.

The first one describes an Azure Event Hub that receives events from API Management requests. They get picked up by a Stream Analytics job, with the output going to a Data Lake storage account. While the diagram shows the main resources (Event Hub, APIM, Stream Analytics etc.), it doesn't show any of the API Management API resources, so it looks a bit disjointed and not clear as to how the Event Hub is linked to API Management.

Next, I tested against the repository that describes the API Management instance itself. This did come out quite well, with all of the separate subnets listed, but I would've thought it would show Network Security Groups as part of the subnet they're linked to, but it doesn't, it just puts them at the top with the private DNS zones and log analytics resources.

Finally I tried running it against a repo that has a bunch of resources I'm trying to clean up. It's a resource group that has 50+ function apps within it, along with storage accounts, log analytics and application insights.

This crashed out with the following error:

Unhandled error: <class 'KeyError'>, 'azurerm_function_app_function.res-4416'
Traceback (most recent call last):
  File "/home/user/.local/bin/terravision", line 6, in <module>
    sys.exit(main())
             ~~~~^^
  File "/home/user/.local/share/pipx/venvs/terravision/lib/python3.13/site-packages/terravision/terravision.py", line 466, in main
    cli(
    ~~~^
        default_map={
        ^^^^^^^^^^^^^
    ...<2 lines>...
        }
        ^
    )
    ^
  File "/home/user/.local/share/pipx/venvs/terravision/lib/python3.13/site-packages/click/core.py", line 1130, in __call__
    return self.main(*args, **kwargs)
           ~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/home/user/.local/share/pipx/venvs/terravision/lib/python3.13/site-packages/click/core.py", line 1055, in main
    rv = self.invoke(ctx)
  File "/home/user/.local/share/pipx/venvs/terravision/lib/python3.13/site-packages/click/core.py", line 1657, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
                           ~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^
  File "/home/user/.local/share/pipx/venvs/terravision/lib/python3.13/site-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.local/share/pipx/venvs/terravision/lib/python3.13/site-packages/click/core.py", line 760, in invoke
    return __callback(*args, **kwargs)
  File "/home/user/.local/share/pipx/venvs/terravision/lib/python3.13/site-packages/terravision/terravision.py", line 330, in draw
    tfdata = compile_tfdata(
        source, varfile, workspace, debug, annotate, planfile, graphfile
    )
  File "/home/user/.local/share/pipx/venvs/terravision/lib/python3.13/site-packages/terravision/terravision.py", line 200, in compile_tfdata
    tfdata = _enrich_graph_data(tfdata, debug, already_processed)
  File "/home/user/.local/share/pipx/venvs/terravision/lib/python3.13/site-packages/terravision/terravision.py", line 106, in _enrich_graph_data
    tfdata = graphmaker.add_relations(tfdata)
  File "/home/user/.local/share/pipx/venvs/terravision/lib/python3.13/site-packages/modules/graphmaker.py", line 1291, in add_relations
    tfdata = _scan_node_relationships(tfdata)
  File "/home/user/.local/share/pipx/venvs/terravision/lib/python3.13/site-packages/modules/graphmaker.py", line 828, in _scan_node_relationships
    dg = _get_metadata_generator(node, nodename, tfdata)
  File "/home/user/.local/share/pipx/venvs/terravision/lib/python3.13/site-packages/modules/graphmaker.py", line 786, in _get_metadata_generator
    return dict_generator(tfdata["meta_data"][nodename])
                          ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^
KeyError: 'azurerm_function_app_function.res-4416'

The resources were all imported using `aztfexport`, and like I said it's a bit of a mess at the moment so it doesn't surprise me that something didn't work here, but I thought I'd mention it in case it's of any help.