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https://github.com/IfcOpenShell/IfcOpenShell.git
synced 2026-08-28 07:49:59 +00:00
Dion Moult
091b4d4113
The wasm heap grew past 2 GB on a 66-model session (surfacing first as the setBindGroup 2 GB TypeError, fixed separately) because CPU memory attached to loaded geometry never shrank while the GPU pool did: - mesh_triangles_cache — the dequantised positions + LOD0 indices the surface raycasts and measurement tools read — was filled once per mesh on first residency (gated on mesh_local_volumes == 0) and never released, converging over a session to the whole federation's geometry on the heap: 12 B/vertex + 4 B/index, 400 MB - 1 GB at this scale. And on web nothing reads it at all (no measurement tools yet). - Every chunk's cull scratch was reserved at model load (20 B/instance scene-wide) and the scratch + uploaded mirrors survived eviction. - Cull ran the HiZ test and emitted VisibleDrawGpu entries — then uploaded them — for non-resident chunks render() cannot draw. Now the shadow follows GPU residency: a per-mesh resident-chunk refcount (the spatial planner may duplicate a mesh into several chunks) is counted up in applyStreamedChunk and down in unloadChunk, releasing the mesh's entry at zero and refilling from the chunk bytes on the next residency. mesh_local_volumes (8 B/mesh) is kept across eviction so the Volume tool still covers evicted meshes. Hosts opt in via ViewportHost::wantsCpuMeshTriangles(): Qt yes, web no until the tools are ported — so on web the shadow costs nothing. Cull stops at the streaming counters for non-resident chunks, the eager scratch reserve is gone, and unloadChunk releases the scratch and uploaded mirrors. Clearing the mirrors also fixes a real staleness bug in unload/load: the model's cull buffers are recreated on load, and a stale mirror would make the memcmp dirty-check skip the first upload into the fresh (garbage) buffer. The heartbeat log reports the shadow (cpuTris). Measured on a 3-model / 990 MB scene: shadow tracks residency (493 MB at a 530 MB resident set, flat over minutes of streaming churn; previously monotonic), unload drops it to zero, reload refills it (verified via readbackMeshTriangles round trip). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
IfcOpenShell
IfcOpenShell is an open source (LGPL) software library for working with Industry Foundation Classes (IFC). Complete parsing support is provided for IFC2x3 TC1, IFC4 Add2 TC1, IFC4x1, IFC4x2, and IFC4x3 Add2. Extensive geometric support is implemented for the IFC releases IFC2x3 TC1 and IFC4 Add2 TC1. Extending with support for arbitrary IFC schemas is possible at compile-time when using C++ and at run-time when using Python.
In addition to a C++ and Python API, IfcOpenShell comes with an ecosystem of tools, notably including IfcConvert (an application to convert IFC models to other formats), Bonsai (an add-on to Blender providing a graphical IFC authoring platform), and many other libraries, CLI apps, and more. Support is also provided for auxiliary standards such as BCF and IDS.
For more information, see:
Development is sponsored through your generous donations!
Contents
| Name | Description | License | Service |
|---|---|---|---|
| bcf | Library to read and write BCF-XML and query OpenCDE BCF-API modules | LGPL-3.0-or-later |   |
| bonsai | Add-on to Blender providing a graphical native IFC authoring platform | GPL-3.0-or-later |    |
| bsdd | Library to query the bSDD API | LGPL-3.0-or-later |  |
| ifc2ca | Utility to convert IFC structural analysis models to Code_Aster | LGPL-3.0-or-later | |
| ifc4d | Convert to and from IFC and project management software | LGPL-3.0-or-later |  |
| ifc5d | Report and optimise cost information from IFC | LGPL-3.0-or-later |  |
| ifcbimtester | Wrapper for Gherkin based unit testing for IFC models | LGPL-3.0-or-later | |
| ifcblender | Historic Blender IFC import add-on | LGPL-3.0-or-later* | |
| ifccityjson | Convert CityJSON to IFC | LGPL-3.0-or-later |  |
| ifcclash | Clash detection library and CLI app | LGPL-3.0-or-later |  |
| ifcconvert | CLI app to convert IFC to many other formats | LGPL-3.0-or-later* |   |
| ifccsv | Library and CLI app to export and import schedules from IFC | LGPL-3.0-or-later |  |
| ifcdiff | Compare changes between IFC models | LGPL-3.0-or-later |  |
| ifcedit | CLI wrapper for ifcopenshell.api IFC model mutation functions | LGPL-3.0-or-later |  |
| ifcfm | Extract IFC data for FM handover requirements | LGPL-3.0-or-later |  |
| ifcmax | Historic extension for IFC support in 3DS Max | LGPL-3.0-or-later* | |
| ifcmcp | MCP server for querying and editing IFC building models | LGPL-3.0-or-later |  |
| ifcopenshell-python | Python library for IFC manipulation | LGPL-3.0-or-later* |         |
| ifcpatch | Utility to run pre-packaged scripts to manipulate IFCs | LGPL-3.0-or-later |  |
| ifcquery | CLI tool for querying and inspecting IFC building models | LGPL-3.0-or-later |  |
| ifcsverchok | Blender Add-on for visual node programming with IFC | GPL-3.0-or-later |  |
| ifctester | Library, CLI and webapp for IDS model auditing | LGPL-3.0-or-later |  |
The IfcOpenShell C++ codebase is split into multiple interal libraries:
| Name | Description | License |
|---|---|---|
| ifcgeom | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcgeom_schema_agnostic | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcgeomserver | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcjni | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcparse | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| ifcwrap | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| serializers | Internal library for IfcOpenShell | LGPL-3.0-or-later* |