1. Open your project's aerotriangulation
In iTwin Capture Modeler, expand the Aerotriangulations node in the tree, right-click the AT you want to export.
2. Choose Export → Export block
From the right-click menu, select Export block (sometimes labelled Export as ContextCapture XML depending on version).
3. Set output format
Format: BlocksExchange XML (v3.2 or later).
Include: Photogroups, Photos, Poses (all three checked).
Include: Near/Median/Far depth if the option is available — improves photo filtering.
4. Coordinate reference system (CRS)
iTwin will offer a CRS dropdown. Two options both work:
EPSG:4978 ECEF (iTwin's native format — simplest, script auto-converts)
EPSG:32756 WGS 84 / UTM Zone 56S (used directly, no conversion needed)
Note: If iTwin offers “WGS84 Geographic (EPSG:4326)” only, that also works but positions will be in lat/lon. Script handles all three.
5. Save the XML
Filename: usually Block_1 - AT.xml or <projectname>_AT_export.xml.
Save to your project's local folder (e.g. D:\\01-PROJECTS\\<PROJECT>\\02-ITWIN\\).
6. Paste the XML path above
In Explorer, right-click the exported .xml file → Copy as path → paste into the input field. The script will run at upload time to build the camera index.
Verify at build time: the console output must show “Scene bounds (UTM EPSG:32756)” with X values around 500,000 and Y values around 6,954,000 (for southeast Queensland projects). If you see values in the millions or negatives, the CRS conversion didn't happen and the script needs updating.