thatopen-impl-measurements

To add measurement tools to a ThatOpen BIM viewer without lifecycle bugs, configure LengthMeasurement, AreaMeasurement, VolumeMeasurement, and AngleMeasurement interactions while enforcing world assignment and safe create/end/cancel/delete workflows to prevent preview element leaks.

Configuring snapping for distance and area measurements in web-ifc requires applying LINE, POINT, or FACE snapping modes and adjusting snapDistance and pickerSize parameters. This prevents missing-precision errors and ensures accurate picking during polygon area and distance calculations.

A BIM viewer leaves preview elements behind after canceling a volume measurement due to incorrect lifecycle handling. You must follow safe create/end/cancel/delete workflows and listen for the onPreviewInitialized event to properly manage and clear preview state.

Yes, you must assign a required world reference before enabling angle measurements in a ThatOpen viewer. Enforcing this world assignment prior to enabling the three-point angle measurement interaction ensures correct spatial calculations and prevents inconsistent measurement results.

Yes, you can synchronize measurement UI state using onStateChanged, onEnabledChange, and onVisibilityChange events. These events drive UI updates and ensure state synchronization across distance, area, volume, and angle measurement interactions within the BIM viewer.

To handle correct unit rounding for face-selected volume measurements, you must select the appropriate measurement units and apply correct rounding configurations. This ensures consistent formatting and accurate volume calculations when interacting with mapped face geometries.