mirror of
https://github.com/IfcOpenShell/IfcOpenShell.git
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Dion Moult
406124ca3d
Stage 7 of the wgpu port. Per-frame after the main render pass:
1. encodeHizResolve runs a depth-only render pass that samples the
MSAA depth texture (sample 0) and max-reduces it into a small
single-sample Depth32Float target (256 × ~h-aspect). Implemented
as a fullscreen-triangle WGSL pipeline; one nested loop per
output texel over its source rect. WebGPU has no built-in depth
resolve, so this combined resolve+downsample fragment shader is
the way.
2. copyTextureToBuffer writes the small resolved depth into a
CPU-mappable staging buffer (≈ 160 KB at 256×160).
3. readbackAndBuildHizPyramid maps the staging buffer (sync via
wgpuInstanceProcessEvents — small enough that the stall is
well under a millisecond), strips per-row padding, and CPU
max-reduces a full mip pyramid (level 0 → 1×1). Stores the VP
used so the next frame can project AABBs into the same space.
Next frame, cullModelCpu calls aabbOccludedByHiz after the frustum
test: projects all 8 AABB corners through hiz_vp_, computes the
screen-space AABB and the nearest projected z, picks the mip level
where the AABB covers ≤ 2 texels per axis, samples that level's 2×2
window, and culls iff min_z > max_pyramid_depth in [0,1] z.
Plumbing changes:
- depth_texture_ gains TextureBinding usage so the resolve shader
can read it.
- hiz_enabled_ master switch defaults true; mirrors IFC_NO_HIZ in
the GL backend. Disabling skips encode + readback entirely.
- Bench output's "hiz_rej N" field now reflects actual rejections.
Verified: basic.ifc (3 instances, no occluders) renders pixel-
identical to pre-HiZ — proves the test rejects nothing it shouldn't.
Real rejection counts need a dense scene; this should drop visible-
objects count noticeably on real BIM benchmarks where back-of-room
walls hide each other.
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* |