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ifcsverchok: document the active-file workflow for querying an existing IFC

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IFC By Type / By Id / By Guid / Read Entity read from the internal
SvIfcStore active file rather than a socket, and there is no supported
way to feed a file loaded via IFC Read File into them (confirmed live:
IFC By Type has no file input socket, and mixing the low-level file-socket
nodes with the high-level SvIfcStore-based nodes does not work). Document
the current working path: open the file in Bonsai, then use "Use Bonsai
IFC File" from the IfcSverchok panel. See issue #6809.

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Petru Conduraru
2026-07-21 12:09:54 +03:00
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src/ifcsverchok/README.md
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@@ -37,6 +37,16 @@ Most nodes have a help description, and input tooltips, that show show up when h
### IfcSverchok panel ### IfcSverchok panel
IfcSverchok creates a "IfcSverchok" tab in the Nodes panel. It includes a "Re-run all nodes" button that creates a fresh IFC File and a "Write File" button. It's recommended to re-run all nodes before saving the file either through the panel or the "Write File" node. IfcSverchok creates a "IfcSverchok" tab in the Nodes panel. It includes a "Re-run all nodes" button that creates a fresh IFC File and a "Write File" button. It's recommended to re-run all nodes before saving the file either through the panel or the "Write File" node.
### Working with an existing IFC file
Nodes such as "IFC By Type", "IFC By Id", "IFC By Guid" and "IFC Read Entity" do not have a "file" input socket. They always operate on a single active IFC model tracked internally (`SvIfcStore`), not on a file object passed through the node tree. By default that active model is an empty, freshly generated demo project.
To query an existing IFC file with these nodes:
1. Open the file in Bonsai first (`File > Open`, or `File > Import > IFC`).
2. In the Sverchok Node Editor's "IfcSverchok" tab (N-panel), click "Use Bonsai IFC File". This points `SvIfcStore` at the file currently open in Bonsai for the duration of that graph update, so nodes like "IFC By Type" will return real elements from it.
There is no supported way to feed a file loaded via the "IFC Read File" node (or created via "IFC Create File"/"IFC Create Project") into "IFC By Type" and similar nodes. Those are two separate, non-interchangeable node families: a small set of low-level nodes that pass `ifcopenshell.file` objects through sockets, and the higher-level nodes listed above that always read from the active Bonsai/`SvIfcStore` file. Mixing the two is not currently possible.
## Examples ## Examples
### Parametric Facade ### Parametric Facade
The sverchok model was kindly provided by Erindale Woodford [https://twitter.com/erindale_xyz](https://twitter.com/erindale_xyz). Check out the sverchok script and the resulting IFC model in the example_files folder. The sverchok model was kindly provided by Erindale Woodford [https://twitter.com/erindale_xyz](https://twitter.com/erindale_xyz). Check out the sverchok script and the resulting IFC model in the example_files folder.