3D Viewer & Audit Workbench

Purpose

The 3D Viewer & Audit Workbench delivers an integrated visual environment where geometric digital twin models and statutory compliance data exist in unison. Rather than forcing auditors to cross-reference static PDF clash matrices with external BIM models, BIM Checker evaluates models live and projects compliance verdicts directly into the 3D WebGL viewport.

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The Dual-Inspection Interface

The requirements workspace is split into two coordinated panels:

1. 3D WebGL Viewport (NativeITwinViewer):
   • Renders massive multi-gigabyte infrastructure and hospital digital twins directly in modern web browsers without plugins.
   • Provides smooth orbit, pan, fly-through, and floor-by-floor section cut tools.
2. Interactive Requirements Workbench (BimRequirementsPanel):
   • A collapsible side panel (width adjustable from $340\text{px}$ to $680\text{px}$) hosting the active rule accordion, parameter cards, execution controls, and defect registries.

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Thematic Audit Shading (AuditColorService)

When an audit is executed or hydrated from a previously published changeset, BIM Checker applies instant thematic color-coding across physical elements:

Color	Audit State	Visual Meaning
🟢 Emerald Green	Compliant	Element completely satisfies all evaluated statutory thresholds (e.g., door effective width $\ge 1.20\text{m}$, soffit headroom $\ge 2.40\text{m}$).
🟡 Amber Yellow	Warning Buffer	Element passes the statutory minimum but falls within the precautionary tolerance buffer (e.g., headroom between $2.40\text{m}$ and $2.50\text{m}$).
🔴 Crimson Red	Defect	Element violates statutory regulations or design briefs. Click to isolate and inspect defect parameters.
⚪ Semi-Transparent Ghost	Neutral / Context	Non-evaluated building structure (e.g. foundational slabs, exterior facade) displayed as neutral context.

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Levels & Models Hierarchy Panel

When auditing large multi-storey facilities like acute hospitals, isolating specific storeys and discipline systems is essential:

• Storey Isolation: Toggle individual levels (e.g., isolate Level 2 or Level 7A) to peel away upper storeys and inspect internal corridor circulation.
• Discipline Visibility: Enable or disable specific discipline models (e.g., view only WRSH_Architectural and WRSH_Mechanical to analyze ductwork headroom conflicts).
• Category Control: Control visibility of specific drawing categories (such as ceilings, structural framing, or pipe accessories).

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Defect Triage & Camera Zoom-to-Element

Auditors can resolve spatial non-compliance in seconds:

1. In the workbench defect list, click on any flagged element row.
2. The 3D camera smoothly glides and centers onto the offending asset.
3. Surrounding elements fade to translucent wireframes, emphasizing the target element and its bounding clash envelope.
4. The property grid displays all live BIS attributes and raw ECSQL property values for immediate design remediation.