IfcIO v0.8.0

Major Additions & Capabilities

• IfcOpenShell-Compatible 3D Geometric Clash Detection (IfcClashDetector / IfcIO.Clash):
  • High-performance collision engine executing broad-phase AABB bounding box pruning and narrow-phase Möller triangle-to-triangle intersection testing in pure managed C#.
  • Cross-model clash detection between contributing discipline models (e.g. Structure vs MEP) and intra-model self-clash detection.
  • Configurable clearance and penetration tolerance, discipline filtering via IfcSelector queries, and storey/type exclusions.
  • Direct export of clash reports to structured JSON (report.SaveJson) and buildingSMART BCF 2.1 zip archives (report.SaveBcf) with perspective camera framing and selected IFC GUIDs.
  • Integrated into IfcModel.DetectClashes(...).
• IfcOpenShell-Compatible Revision Diff & Comparison (IfcDiffEngine / IfcIO.Diff):
  • Full semantic and geometric comparison between two IFC model revisions (baseline vs revision).
  • Detects Added, Deleted, and Modified elements with detailed change sub-categorization:
    • 3D Geometry changes: vertex differences, bounding box shifts, translation vectors.
    • Property changes: added, removed, and modified property set parameters with old and new values.
    • Quantity changes: delta in physical base quantities (lengths, areas, volumes).
    • Spatial container re-assignments (moved between building storeys).
    • Type changes: modified IfcTypeProduct definitions.
  • Direct export of diff reports to structured JSON (report.SaveJson) and buildingSMART BCF 2.1 archives (report.SaveBcf).
  • Integrated into IfcModel.Compare(...).
• Standalone 3D WebGL HTML Viewer Export (IfcHtmlViewerExporter / IfcIO.Exporters):
  • Direct export of any IFC model to a self-contained, interactive single-file 3D HTML application (.html) with zero external dependencies, CDNs, or server requirements.
  • WebGL rendering with orbit camera controls (rotate, pan, zoom), mesh instancing, and material colors.
  • Live fragment-shader section clipping planes (Cut X, Cut Y, Cut Z sliders).
  • Spatial Tree Navigator (Storeys → Elements) with isolate / highlight.
  • Property Inspector displaying full element identity, property sets, and physical quantities.
  • Integrated into IfcModel.SaveHtmlViewer(...).
• CLI Enhancements (IfcIO.Cli):
  • ifcio clash <modelA.ifc> [modelB.ifc] [-o <clashes.json>] [--bcf <clashes.bcfzip>] [--tolerance <meters>]: run geometric clash detection.
  • ifcio diff <baseline.ifc> <revision.ifc> [-o <diff.json>] [--bcf <changes.bcfzip>] [--tolerance <meters>]: compare two model revisions.
  • ifcio view <model.ifc> [-o <model.html>]: export standalone 3D WebGL HTML viewer.