NwcIO v0.10.0

Major Additions & Capabilities

• Microsoft Project XML 4D Schedule Serialization (NwcTimeLinerMsProjectXmlSerializer):
  • Full reading and writing of Microsoft Project XML schedule schema (http://schemas.microsoft.com/project).
  • Preserves hierarchical WBS outlines (OutlineLevel, OutlineNumber, WBS), planned and actual dates, ISO 8601 duration (PT#H0M0S), percent complete, and costs.
  • Roundtrips attached Selection Set names and TaskType through task Notes.
  • Direct integration into NwcDocument and NwcAssembly via ExportTimeLinerMsProject and ImportTimeLinerMsProject.
• Primavera P6 XER 4D Schedule Serialization (NwcTimeLinerPrimaveraXerSerializer):
  • Full reading and writing of Primavera P6 tab-delimited XER exchange format (ERMHDR, %T PROJECT, %T PROJWBS, %T TASK).
  • Serializes task codes, activity names, target and actual start/finish timestamps, durations in hours, physical completion percentages, and planned/actual costs.
  • Direct integration into NwcDocument and NwcAssembly via ExportTimeLinerPrimavera and ImportTimeLinerPrimavera.
• Interactive 3D WebGL Viewer Enhancements (NwcHtmlViewerExporter):
  • 6-Sided Section Box Volume: Switchable sectioning mode between 3-axis cutting planes and a 6-sided clipping box. Includes interactive box scaling, invert mode (inside vs outside clipping volume), visual 3D wireframe bounding box overlay projection, and instant "Fit Selection" bounding box fitting.
  • Smooth Camera Animations: Cubic ease-in-out animated camera transitions when focusing saved viewpoints or clash detection conflict items.
  • Turntable Presentation Mode: 360° continuous turntable orbit animation for interactive model review and project presentations.
  • Saved Viewpoints Walkthrough Tour: Automated tour player (Play Tour / Pause Tour) cycling through all saved viewpoints with smooth camera transitions and pauses.
• CLI Commands (nwcio):
  • Added --timeliner-msproject <file.xml>: Export or import 4D TimeLiner schedule in Microsoft Project XML format.
  • Added --timeliner-primavera <file.xer>: Export or import 4D TimeLiner schedule in Primavera P6 XER format.

NwcIO v0.9.0

Major Additions & Capabilities

• 4D TimeLiner XML Serialization & Exchange (NwcTimeLinerXmlSerializer):
  • Full reading and writing of Autodesk Navisworks TimeLiner Exchange XML format (<exchange> schema).
  • WBS task hierarchies with nested subtasks, planned/actual dates, duration tracking, planned and actual costs, and percentage progress.
  • Roundtrip persistence of attached Selection Set names and explicit attached node IDs.
  • Direct integration into NwcDocument (ExportTimeLinerXml, ImportTimeLinerXml) and NwcAssembly (ExportTimeLinerXml, ImportTimeLinerXml).
• Automated Rule-Based Schedule Linking (NwcTimeLinerLinker):
  • AutoLink: Automated binding of 4D TimeLiner tasks to model geometry using matching Selection Set or Search Set names (task.AttachedSelectionSetName or task.Name).
  • Resolves explicit node IDs from NwcSelectionSet and evaluates dynamic condition queries from NwcSearchSet.
  • LinkByNodeName: Direct fuzzy or exact name matching against scene graph elements.
• Multi-Discipline Coordination Clash Matrix (NwcClashMatrix, NwcClashDiscipline, NwcClashMatrixCell):
  • Execution of comprehensive $N \times M$ BIM clash coordination matrices across discipline models (Architecture, Structure, MEP, etc.).
  • Automated matrix population from federated assembly models (NwcClashMatrix.CreateFromAssembly).
  • Spatial pruning and double-precision AABB intersection penetration calculation.
  • Ignore rules evaluation (same layer, same file, tolerance thresholds).
  • Formatted Markdown coordination summary table generation (ToMarkdownTable).
  • Structured JSON report export (SaveJson, ExportClashMatrixJson).
  • Unified buildingSMART BCF 2.1 zip archive export (SaveBcf, ExportClashMatrixBcf), creating issue topics with 3D camera viewpoints and highlighted IFC components for coordination in Revit, Solibri, and BIMcollab.
• Interactive 4D TimeLiner & Selection Sets HTML WebGL Viewer (NwcHtmlViewerExporter):
  • Integrated 4D TimeLiner playback controller with Play/Pause button, timeline slider scrubber, dynamic date label, and speed multiplier (1x, 5x, 15x, 60x).
  • Dynamic 3D simulation color coding: active construction glowing green ([0.2, 0.95, 0.2]), demolition highlighted red ([0.95, 0.2, 0.2]), temporary elements yellow, and unstarted elements hidden from the render loop.
  • Interactive Selection Sets sidebar tab (#tab-sets) rendering hierarchical folder trees and selection items with instant 3D model highlighting on click.
• CLI Enhancements (nwcio):
  • Added --timeliner-xml <file.xml>: Export or import 4D TimeLiner schedule exchange XML.
  • Added --link-timeliner: Automatically links schedule tasks to Selection Sets, Search Sets, or element names.
  • Added --clash-matrix <file.json>: Executes multi-discipline coordination matrix and exports JSON report.
  • Added --clash-matrix-md <file.md>: Exports clash matrix coordination report as Markdown table.
  • Added --clash-matrix-bcf <file.bcfzip>: Exports clash matrix conflicts to buildingSMART BCF 2.1 zip archive.

NwcIO v0.8.0

Major Additions & Capabilities

• Model Revision Comparison & Diff Engine (NwcDiffEngine, NwcDiffTypes):
  • Full revision comparison of Navisworks documents and federated assemblies (baseline.Compare(revision, options)).
  • Identification of added, deleted, modified, and unchanged BIM elements and scene nodes by GUID and composite hierarchy matching.
  • Double-precision 3D geometric deviation detection, measuring translation shift vectors and bounding box alterations beyond configurable tolerance (default 5mm).
  • Deep property record delta inspection, tracking added, removed, and modified parameter values across categories.
  • JSON revision delta report export (report.SaveJson, report.ToJson).
  • buildingSMART BCF 2.1 zip export (report.SaveBcf), generating issue topics with framed 3D viewpoints and highlighted IFC component GUIDs.
• Spatial Grid System & Axis Management (NwcGridSystem, NwcGridLine, NwcGridIntersection):
  • Strongly typed object model for building axes and coordination grids (NwcGridSystem, NwcGridLine, NwcGridIntersection).
  • Automatic 2D/3D intersection calculation between crossing grid lines (e.g. "A / 1", "B / 4").
  • Point-to-grid spatial querying: FindNearestGrid and FindNearestIntersection.
  • Human-readable grid location formatting (FormatLocation), displaying exact grid intersection tags or signed perpendicular offsets with direction awareness (e.g. "A (+0.50m) / 1 (-0.20m)").
  • Automatic population of clash.GridLocation on NwcClashResult and NwcClashGroup (doc.AssignGridLocations, assembly.AssignGridLocations), seamlessly integrating with NwcClashGrouper.GroupByGrid.
  • Automatic extraction of grid systems from document hierarchy and metadata (doc.ExtractGridSystem()).
  • Full XML exchange serialization and deserialization (SaveXml / LoadXml).
• High-Precision 3D Measure Engine (NwcMeasureEngine):
  • Point-to-point 3D Euclidean distance, coordinate deltas ($\Delta X, \Delta Y, \Delta Z$), horizontal distance, vertical height difference, pitch angle, and azimuth direction.
  • Point-to-mesh shortest distance with Christer Ericson's exact Voronoi-region closest point on triangle algorithm.
  • Mesh-to-mesh clearance measurement and closest vertex pair identification.
  • Cumulative polyline path length measurement.
  • Triangle surface area and unit normal vector calculation.
  • Mesh total surface area, closed manifold solid volume calculation ($\sum \frac{1}{6}(v_0 \cdot (v_1 \times v_2))$), and 3D centroid calculation.
  • Angle measurement between direction vectors and 3-point vertices.
• Interactive HTML 3D Viewer Enhancements:
  • Interactive 3D measurement tool: measure distances directly in the browser by clicking two points on the model, displaying dimension lines, distance badges, and coordinate deltas.
  • Spatial grid lines overlay: rendering grid lines with coordinate bubble labels directly over the 3D scene.
• CLI Enhancements (nwcio):
  • Added --diff <baseline.nwc>: Compares current model against a baseline revision.
  • Added --diff-json <file.json>: Exports revision comparison report to JSON.
  • Added --diff-bcf <file.bcfzip>: Exports revision comparison issues to buildingSMART BCF 2.1 archive.
  • Added --diff-tolerance <m>: Sets geometric displacement tolerance for diff (default: 0.005m).
  • Added --grids <file.xml>: Loads a spatial grid system from XML and assigns grid locations.
  • Added --export-grids <file.xml>: Exports extracted or configured grid systems to XML.

Major Additions & Capabilities

• Intelligent Clash Grouping & Clustering Engine (NwcClashGrouper):
  • Spatial 3D proximity clustering (GroupByProximity) using Disjoint-Set (Union-Find) algorithm, grouping thousands of raw collisions into manageable spatial clusters with auto-calculated cluster centroids and optimal framing viewpoints.
  • Element-based grouping (GroupByPrimaryElement) bundling all collisions involving the same continuous MEP run (pipe, duct, cable tray) or structural beam into a single issue.
  • Structural grid grouping (GroupByGrid) clustering collisions by architectural and structural grid intersections.
  • Discipline & layer grouping (GroupByLayer) bundling clashes by layer or discipline pairs.
  • Reversible grouping lifecycle (UngroupAll) dissolving groups back into individual results when needed.
  • Full reading and writing of <clashgroup> elements in Autodesk Navisworks Clash Report XML (NwcXmlClashSerializer).
  • Grouped buildingSMART BCF 2.1 export (NwcClashBcfExporter), exporting clash groups as unified topics with consolidated viewpoints, descriptions, and participating IFC component GUID selections.
• Standalone 3D WebGL HTML Viewer Export (NwcHtmlViewerExporter):
  • Direct export of Navisworks documents and federated assemblies to self-contained, interactive single-file 3D HTML viewers (.html) with zero external script, CDN, or server dependencies.
  • High-performance WebGL rendering with smooth orbit controls (rotate, pan, zoom), mesh instancing, material colors, and HUD scene statistics.
  • Dynamic multi-axis section clipping planes (Cut X, Cut Y, Cut Z sliders) running directly in WebGL fragment shaders.
  • Embedded saved viewpoints palette with instant camera fly-to transitions.
  • Integrated Clash Navigator allowing review of clash groups and collision points in interactive 3D.
  • Property Inspector panel displaying full hierarchical BIM properties of selected elements.
  • Added NwcDocument.SaveHtmlViewer(...) and NwcAssembly.SaveHtmlViewer(...).
• Quick Properties & Tooltip Rules (NwcQuickProperties):
  • Strongly typed object model for configuring Navisworks Quick Properties tooltips (NwcQuickProperties, NwcQuickPropertyDefinition).
  • Built-in standard BIM presets for element names, types, materials, layers, areas, and volumes.
  • Smart node extraction and full roundtrip Navisworks XML serialization (ToXml / FromXml).
• CLI Enhancements (nwcio):
  • Added --html-viewer <file.html> / --viewer <file.html>: Exports models and assemblies to self-contained 3D WebGL HTML viewers.
  • Added --clash-group <proximity|element|grid|layer>: Automatically clusters raw clashes before exporting XML reports or BCF archives.
  • Added --clash-radius <meters>: Configurable spatial radius for proximity clustering (default: 1.0 m).

NwcIO v0.7.0

Major Additions & Capabilities

• Intelligent Clash Grouping & Clustering Engine (NwcClashGrouper):
  • Spatial 3D proximity clustering (GroupByProximity) using Disjoint-Set (Union-Find) algorithm, grouping thousands of raw collisions into manageable spatial clusters with auto-calculated cluster centroids and optimal framing viewpoints.
  • Element-based grouping (GroupByPrimaryElement) bundling all collisions involving the same continuous MEP run (pipe, duct, cable tray) or structural beam into a single issue.
  • Structural grid grouping (GroupByGrid) clustering collisions by architectural and structural grid intersections.
  • Discipline & layer grouping (GroupByLayer) bundling clashes by layer or discipline pairs.
  • Reversible grouping lifecycle (UngroupAll) dissolving groups back into individual results when needed.
  • Full reading and writing of <clashgroup> elements in Autodesk Navisworks Clash Report XML (NwcXmlClashSerializer).
  • Grouped buildingSMART BCF 2.1 export (NwcClashBcfExporter), exporting clash groups as unified topics with consolidated viewpoints, descriptions, and participating IFC component GUID selections.
• Standalone 3D WebGL HTML Viewer Export (NwcHtmlViewerExporter):
  • Direct export of Navisworks documents and federated assemblies to self-contained, interactive single-file 3D HTML viewers (.html) with zero external script, CDN, or server dependencies.
  • High-performance WebGL rendering with smooth orbit controls (rotate, pan, zoom), mesh instancing, material colors, and HUD scene statistics.
  • Dynamic multi-axis section clipping planes (Cut X, Cut Y, Cut Z sliders) running directly in WebGL fragment shaders.
  • Embedded saved viewpoints palette with instant camera fly-to transitions.
  • Integrated Clash Navigator allowing review of clash groups and collision points in interactive 3D.
  • Property Inspector panel displaying full hierarchical BIM properties of selected elements.
  • Added NwcDocument.SaveHtmlViewer(...) and NwcAssembly.SaveHtmlViewer(...).
• Quick Properties & Tooltip Rules (NwcQuickProperties):
  • Strongly typed object model for configuring Navisworks Quick Properties tooltips (NwcQuickProperties, NwcQuickPropertyDefinition).
  • Built-in standard BIM presets for element names, types, materials, layers, areas, and volumes.
  • Smart node extraction and full roundtrip Navisworks XML serialization (ToXml / FromXml).
• CLI Enhancements (nwcio):
  • Added --html-viewer <file.html> / --viewer <file.html>: Exports models and assemblies to self-contained 3D WebGL HTML viewers.
  • Added --clash-group <proximity|element|grid|layer>: Automatically clusters raw clashes before exporting XML reports or BCF archives.
  • Added --clash-radius <meters>: Configurable spatial radius for proximity clustering (default: 1.0 m).

NwcIO v0.6.0

Major Additions & Capabilities

• Dynamic 3D Sectioning & Mesh Clipping Engine:
  • Strongly typed sectioning model (NwcIO.Model.Sectioning): NwcSectionPlane, NwcSectionBox, and NwcSectionAlignment.
  • Up to 6 simultaneous dynamic clipping planes conforming to Autodesk Navisworks sectioning modes (Top, Bottom, Front, Back, Left, Right, View, Custom).
  • High-performance 3D polygon clipping engine (NwcMeshClipper) based on Sutherland-Hodgman polygon clipping, splitting triangle meshes against arbitrary section planes and oriented section boxes in pure managed C#.
• Redline Markup Annotations:
  • Comprehensive redline markup object model (NwcIO.Model.Redline): NwcRedline, NwcRedlineText, NwcRedlineLine, NwcRedlineArrow, NwcRedlineCloud, NwcRedlineEllipse, NwcRedlineTag, NwcRedlineStatus.
  • Support for 2D/3D markup positions, custom RGBA colors, font size, stroke thickness, revision authors, timestamps, and review status workflows.
  • Linked to NwcSavedViewpoint.Redlines collection.
• Autodesk Navisworks XML Viewpoint Exchange (NwcXmlViewpointSerializer):
  • Full reading and writing of Autodesk Navisworks saved viewpoints exchange XML (viewpoints.xml) conforming to nw-exchange-12.0.xsd.
  • Preserves camera projection, positions, orientation quaternions, active clipping section planes, and all redline markup annotations.
• buildingSMART BCF 2.1 Viewpoint & Redline Bridge (NwcViewpointBcfExporter):
  • Exports saved viewpoints, clipping planes (<ClippingPlanes>), and redline line/markup annotations (<Lines>) directly to BCF 2.1 zip archives (.bcfzip).
  • Cross-platform BIM collaboration bridge enabling Navisworks markups and sections to be viewed directly in Revit, Solibri, Archicad, and BIMcollab.
• Section-Aware IFC Export:
  • Extended NwcIfcExportOptions with SectionBox, SectionPlanes, and ClipGeometryWithSectionPlanes.
  • Automatically clips 3D geometry during IFC export (Ifc2x3 and Ifc4), generating clean cropped IFC models.
• Document & Assembly API Integration:
  • Added NwcDocument.SaveViewpointsXml(...) and NwcDocument.ToViewpointsXml().
  • Added NwcAssembly.SaveViewpointsXml(...) and NwcAssembly.ToViewpointsXml().
• CLI Enhancements (nwcio):
  • Added --viewpoints-xml <file.xml>: exports saved viewpoints, active section planes, and redlines to Autodesk Navisworks XML format.

Major Additions & Capabilities

• Navisworks Clash Detective & 3D Triangle Collision Engine:
  • High-performance, clean-room 3D clash detection engine (NwcClashDetector):
    • Broad-phase collision pruning using bounding volume hierarchy (BVH) and axis-aligned bounding boxes (AABB).
    • Narrow-phase exact triangle-to-triangle intersection testing using Möller's algorithm in pure managed C#.
    • Exact clash point calculation and penetration distance / clearance computation.
    • Automatic creation of isometric perspective viewpoints focused on each collision volume.
  • Strongly typed object model (NwcIO.Model.Clash): NwcClashTest, NwcClashResult, NwcClashObject, NwcClashComment, NwcClashRule, NwcClashSelection, NwcClashBatch.
  • Clash status lifecycle: New, Active, Reviewed, Approved, Resolved.
  • Test types: Hard, Clearance, Duplicates, Conservative.
  • Configurable exclusion rules: IgnoreSameLayer, IgnoreSameGroup, IgnoreSameFile.
• Autodesk Navisworks Clash Report XML Exchange (NwcXmlClashSerializer):
  • Full reading and writing of Autodesk Navisworks Clash Report XML files (nw-clashreport-11.0.xsd).
  • Serializes <batchtest>, <classtests>, <classtest>, <rules>, <summary>, <clashresults>, <clashresult>, <clashpoint>, <gridlocation>, <clashobjects>, <comments>.
• buildingSMART BCF 2.1 Issue Management (NwcClashBcfExporter):
  • Direct export of clash detection results to buildingSMART BCF 2.1 zip archives (.bcfzip) without external dependencies.
  • Each clash result is mapped to a BcfTopic with perspective camera parameters, visual framing, and component selections referencing 22-character IFC GUIDs.
  • Direct bridge between Navisworks clash results and open-standard BIM coordination tools (Revit, Solibri, Archicad, BIMcollab).
• Navisworks Federated Project Manifest (NWF) (NwcNwfManifest):
  • Model coordination manifest representing federated NWF projects: external model links, saved viewpoints, selection/search sets, appearance profiler rules, and clash detective tests.
  • assembly.SaveNwf("project.nwf.xml") and NwcAssembly.ToNwfManifest().
• Document & Assembly API Integration:
  • NwcDocument.RunClashDetection(test) and NwcAssembly.RunClashDetection(testName, tolerance).
  • NwcDocument.ExportClashReportXml(path) and NwcDocument.ExportClashBcf(path).
  • NwcDocument.LoadClashReportXml(path).
  • NwcDocument.FindSet(name) and NwcDocument.FindNodes(condition).
  • NwcDocumentBuilder.AddClashTest(test).
• CLI Enhancements (nwcio):
  • Added --clash-xml <report.xml>: runs clash detection and exports Navisworks Clash Report XML.
  • Added --clash-bcf <issues.bcfzip>: runs clash detection and exports buildingSMART BCF 2.1 archive.
  • Added --clash-tolerance <meters>: sets clash detection tolerance (default: 0.001 m).
  • Added --nwf-xml <manifest.xml>: exports federated coordination manifest in NWF XML format.

NwcIO v0.5.0

Major Additions & Capabilities

• Navisworks Clash Detective & 3D Triangle Collision Engine:
  • High-performance, clean-room 3D clash detection engine (NwcClashDetector):
    • Broad-phase collision pruning using bounding volume hierarchy (BVH) and axis-aligned bounding boxes (AABB).
    • Narrow-phase exact triangle-to-triangle intersection testing using Möller's algorithm in pure managed C#.
    • Exact clash point calculation and penetration distance / clearance computation.
    • Automatic creation of isometric perspective viewpoints focused on each collision volume.
  • Strongly typed object model (NwcIO.Model.Clash): NwcClashTest, NwcClashResult, NwcClashObject, NwcClashComment, NwcClashRule, NwcClashSelection, NwcClashBatch.
  • Clash status lifecycle: New, Active, Reviewed, Approved, Resolved.
  • Test types: Hard, Clearance, Duplicates, Conservative.
  • Configurable exclusion rules: IgnoreSameLayer, IgnoreSameGroup, IgnoreSameFile.
• Autodesk Navisworks Clash Report XML Exchange (NwcXmlClashSerializer):
  • Full reading and writing of Autodesk Navisworks Clash Report XML files (nw-clashreport-11.0.xsd).
  • Serializes <batchtest>, <classtests>, <classtest>, <rules>, <summary>, <clashresults>, <clashresult>, <clashpoint>, <gridlocation>, <clashobjects>, <comments>.
• buildingSMART BCF 2.1 Issue Management (NwcClashBcfExporter):
  • Direct export of clash detection results to buildingSMART BCF 2.1 zip archives (.bcfzip) without external dependencies.
  • Each clash result is mapped to a BcfTopic with perspective camera parameters, visual framing, and component selections referencing 22-character IFC GUIDs.
  • Direct bridge between Navisworks clash results and open-standard BIM coordination tools (Revit, Solibri, Archicad, BIMcollab).
• Navisworks Federated Project Manifest (NWF) (NwcNwfManifest):
  • Model coordination manifest representing federated NWF projects: external model links, saved viewpoints, selection/search sets, appearance profiler rules, and clash detective tests.
  • assembly.SaveNwf("project.nwf.xml") and NwcAssembly.ToNwfManifest().
• Document & Assembly API Integration:
  • NwcDocument.RunClashDetection(test) and NwcAssembly.RunClashDetection(testName, tolerance).
  • NwcDocument.ExportClashReportXml(path) and NwcDocument.ExportClashBcf(path).
  • NwcDocument.LoadClashReportXml(path).
  • NwcDocument.FindSet(name) and NwcDocument.FindNodes(condition).
  • NwcDocumentBuilder.AddClashTest(test).
• CLI Enhancements (nwcio):
  • Added --clash-xml <report.xml>: runs clash detection and exports Navisworks Clash Report XML.
  • Added --clash-bcf <issues.bcfzip>: runs clash detection and exports buildingSMART BCF 2.1 archive.
  • Added --clash-tolerance <meters>: sets clash detection tolerance (default: 0.001 m).
  • Added --nwf-xml <manifest.xml>: exports federated coordination manifest in NWF XML format.

NwcIO v0.4.0

Major Additions & Capabilities

• Autodesk Navisworks Appearance Profiler:
  • Strongly typed appearance rule and profiler model: NwcAppearanceRule and NwcAppearanceProfiler.
  • Color overrides (RGB) and transparency levels (0.0 to 1.0) dynamically mapped to scene graph nodes and geometry meshes using NwcSearchCondition criteria.
  • Scene traversal engine: NwcAppearanceProfiler.Apply(NwcDocument) applies rules across the full scene tree and geometry meshes, updating element materials.
  • Multi-model assembly support: NwcAssembly.ApplyAppearanceProfiler(NwcAppearanceProfiler) applies rules across all contributing federated models.
  • XML exchange: NwcXmlAppearanceProfilerSerializer reading and writing Autodesk Navisworks Appearance Profiler rule files (.xml) adhering to the official nw-exchange-12.0.xsd schema.
• Fluent Builder & Document Integration:
  • Added NwcDocument.ApplyAppearanceProfiler(...) and NwcDocument.ExportAppearanceProfilerXml(...).
  • Added NwcDocumentBuilder.SetAppearanceProfiler(...) and NwcDocumentBuilder.AddAppearanceRule(...).
• CLI Enhancements (nwcio):
  • Added --profiler <rules.xml>: loads appearance profiler XML rules and applies color/transparency overrides before exporting to GLB, IFC, OBJ, JSON, or NWC.
  • Added --export-profiler <rules.xml>: exports the document's appearance profiler rules to an XML file.
• Cross-Ecosystem Interoperability (NwcIO ↔ IfcIO):
  • Integration testing between NwcIO and IfcIO verifying end-to-end NWC → IFC STEP physical file generation → IfcModel.Open deserialization of meshes, vertices, triangles, and property sets.

NwcIO v0.3.0

Major Additions & Capabilities

• Selection Sets & Dynamic Search Sets:
  • Strongly typed selection set object model: NwcSelectionSet, NwcSearchSet, NwcSelectionSetFolder, and base NwcSetItem.
  • Dynamic query evaluator: NwcSearchCondition with rich comparison operators (Equals, NotEquals, Contains, StartsWith, EndsWith, Wildcard, GreaterThan, LessThan, etc.) evaluating against node properties, categories, classes, names, and element GUIDs.
  • NwcSearchSet.Evaluate(NwcDocument) recurses through the full scene graph hierarchy to resolve matching nodes at runtime.
  • Standard Autodesk Navisworks Selection Sets XML (.xml) reader and writer (NwcXmlSetSerializer) for importing and exporting set exchange definitions (<exchange><selectionsets>).
• 4D TimeLiner Construction Schedules:
  • Strongly typed schedule and task model: NwcTimeLinerSchedule, NwcTimeLinerTask, task types (Construct, Demolish, Temporary), and simulation states (NotStarted, InProgress, Completed).
  • Hierarchical WBS (Work Breakdown Structure) task trees with planned/actual start/end dates, planned/actual costs, and selection set bindings.
  • 4D Construction Simulation Engine: query temporal progress via GetActiveTasksAt(DateTimeOffset), GetSimulationProgressAt(DateTimeOffset), and GetNodeStateAt(int nodeId, DateTimeOffset).
  • Standard TimeLiner CSV exchange (NwcTimeLinerCsvSerializer) supporting standard task schedule spreadsheet import and export.
• Binary Partition Stream Serialization & Ingestion:
  • Stream classifiers and binary raw stream handlers for Selection Sets (tag 100 + 105 / XML payload) and TimeLiner (tag 100 + 106 / CSV payload).
  • Roundtrip persistence of sets and schedules inside Navisworks #LcUStream containers via NwcStreamSerializer.
• CLI Enhancements (nwcio):
  • Added --sets-xml <output.xml> option and automatic .xml extension routing for exporting Navisworks Selection Sets.
  • Added --timeliner-csv <output.csv> option and automatic .csv extension routing for exporting 4D TimeLiner schedules.
  • Added --timeliner-simulate <YYYY-MM-DD> option for querying construction progress, active tasks, and element states at a specific milestone date.
  • Extended --report output with Selection Sets hierarchy counts and TimeLiner schedule/budget summary metrics.

NwcIO v0.2.0

Major Additions & Capabilities

• Programmatic NWC Generation & Serializer (NwcWriter):
  • Full reverse-engineered serialization of Autodesk Navisworks #LcUStream containers and stream partitions from pure managed C#.
  • Binary partition serialization: PartitionHeader (source metadata, loader plugin, timestamp, options), SceneTree (hierarchy nodes, tags 52/53, property types), Transforms (poses, quaternion rotations, bounding boxes), Guids (16-byte raw identifier tables), Geometry chunk records (IEEE 754 float vertices, record tags), and Toc (Table of Contents record lengths and chunk sizes).
  • Built-in compression using managed ZLibStream producing valid, specification-compliant back-to-back zlib stream containers.
  • Saved viewpoint and 3D camera serialization (tag 517).
• Document Save & Fluent Builder API:
  • NwcDocument.Save(string path) and NwcDocument.Save(Stream stream) methods for direct file output.
  • NwcDocument.Create(...) factory method for creating documents from in-memory objects.
  • NwcDocumentBuilder fluent builder pattern for easily creating .nwc documents from code.
  • NwcDocument.Open(Stream stream) for loading Navisworks documents directly from arbitrary streams.
• CLI Enhancement (nwcio):
  • Added --nwc <output.nwc> option and automatic .nwc extension routing for converting, saving, and merging models and assemblies into .nwc files.
• Full Verification:
  • Comprehensive unit and integration test coverage verifying bit-level roundtripping (Create -> Save -> Open -> Verify) across synthetic models and real-world multi-discipline fixtures.

NwcIO v0.1.1

Security & Clean-Room Governance

• Strict Clean-Room Policy: Full abstraction of external test fixtures via NWCIO_TEST_FILES environment variable and optional uncommitted test_files/ directory, mirroring the RvtIO standard.
• Fixture Resolution Helper: Introduced TestFiles helper class in NwcIO.Tests with zero hardcoded filesystem paths or machine-specific fallback directories.
• Documentation: Added docs/test-fixtures.md documenting clean-room testing principles, test skipping rules, and fixture expectations.
• Anonymized Benchmarks: Scrubbed all specific project references, real industrial facility names, and local test model filenames from README, format notes, and tests.