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https://github.com/IfcOpenShell/IfcOpenShell.git
synced 2026-08-17 02:49:12 +00:00
Dion Moult
72af067c9a
Three correctness bugs found and fixed, plus an unrelated fly-mode deadlock surfaced along the way. HiZ false-rejection at the bottom of the screen ------------------------------------------------ The mip-pyramid sizing floored when halving — for a 256×70 mip 0 the level-3 mip is 32×8, but mip-0 row 69 maps to ly = 69>>3 = 8, which is out of bounds for an 8-row mip. ly1 then clamps down to 7 while ly0 stays at 8, the sampling loop runs zero times, max_d retains its initial 0.0, and `min_z > 0` rejects every AABB whose projected y range touches the bottom row. Same class for the right edge on very wide viewports. Fix: ceil rather than floor when halving mip dimensions so every parent row has a covering child texel, plus std::clamp on both lookup endpoints as belt-and-suspenders for any future mip-sizing change. Surfaced after the user added more sidecars and saw "anything near the bottom of the screen, no matter close or far" disappear ~0.5 s after camera stops — that delay was the strict-VP gate + readback latency opening the HiZ window. Found via WGPU_HIZ_TRACE rejection logs that showed every rejection had `max_d=0` and `ly0 > ly1`. Streaming priority lets the ocean starve out the bracing --------------------------------------------------------- Per-instance projected screen footprint was estimated as bounding- sphere radius squared. BIM geometry is overwhelmingly thin-in-one-axis (slabs, pipes, columns, windows) and a flat ocean plane viewed nearly edge-on gets a sphere projection ~250× larger than its actual screen rect. Its chunk dominated the priority ranking and evicted the brace chunks despite the braces being one of the closest visible things. Fix: per-instance priority is now the screen-space AABB rectangle area (world AABB extents projected onto the camera right/up basis vectors, divided by view-z). Sphere radius is retained for the contribution cull and LOD pick because conservative-over is the right failure mode there. Stale-VP HiZ gate ----------------- HiZ resolves into an async ping-pong of staging buffers, so the pyramid resident at cull time was typically captured one or two frames ago. During camera motion the captured VP differs from vp_this_frame and AABBs end up sampling depth taken for what was at slightly-different screen positions in the old view. Strict by default now: HiZ engages only when hiz_vp_ == vp_this_frame. WGPU_HIZ_MOTION=1 trusts the stale pyramid (matches GL's default). Fly mode Shift+Q deadlock -------------------------- keyPressEvent requested a redraw only on the first key of a new held set (was_empty). Pressing Shift first then Q never satisfied that condition because Shift had already populated the set, so the render loop never ticked. Now every relevant keypress calls requestUpdate unconditionally. HiZ stays opt-in behind WGPU_HIZ=1 for one release while the fix bakes; WGPU_HIZ_TRACE=1 keeps the per-rejection diagnostic available for future bugs. 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* |