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Dion Moult
10f8fc88e8
Sidecar LOD1 is per-mesh, index-only — meshoptimizer-baked decimated index slices that share the LOD0 VBO. Before this change the wgpu chunk path force-disabled LOD1 (effective_lod1 = false; tagged in a comment as "until per-chunk LOD1 storage lands"), so it had to walk every visible instance at full LOD0 even when the per-instance LOD selection said the projected radius was below the LOD1 threshold. Per-chunk layout: append LOD1 indices for the chunk's meshes after all LOD0 indices in the same pool slice. A new mesh_chunk_local_lod1_first_u32 array records each mesh's LOD1 starting offset (in u32s) within the chunk's index slice; LOD0 offsets stay where they were. The cull's emit then sets VisibleDrawGpu.ebo_first_u32 to whichever side matches the per- instance use_lod1 decision the prior #8 commit already computed. Vertex pulling is oblivious to the LOD split — it just reads the indices the cull pointed it at. c.index_count is repurposed as the LOD0+LOD1 total so the pool allocation, eviction's pool-fit check, and the VRAM accounting all scale automatically. c.lod1_index_count exposes the LOD1 portion for stats. makeChunkRequest appends LOD1 byte ranges to req.i_ranges in the same per-mesh order; the streaming worker concatenates ranges in order, so the assembled idx blob lands LOD0-first / LOD1-second which matches the chunk-local packing. On a 10-model regen with meshoptimizer-baked sidecars, the bench [frame] heartbeat shows lod1 firing on ~80-90% of LOD1-eligible instances and saving 10-30M tris per frame versus the prior LOD0-only ceiling. Same camera/scene on basic.ifc is still pixel-identical (no mesh in basic.ifc is large enough to bake a LOD1, so the cull just follows the LOD0 path it always did). Temporary debug counters (lod1_dbg_count_ et al.) print "lod1 X/Y (saved Z tris, N no-lod1)" in both interactive and benchmark [frame] heartbeats — kept on while LOD1 correctness gets confirmed across more scenes, will come out once trust is built. The non-streaming applyCachedModel path runs the same LOD1 plumbing but no longer fits the full federation scene in pool (extra index bytes push past the 2 GB single-buffer cap); that mode was already streaming-only on that scene before. Co-Authored-By: Claude Opus 4.7 <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* |
| qtviewer | Internal library for IfcOpenShell | LGPL-3.0-or-later* |
| serializers | Internal library for IfcOpenShell | LGPL-3.0-or-later* |