Transformer doesn't prune unused geometry part references

[MichaelBelousov]

Files transformed by the transformer often keep huge unused definition elements like geometry parts. We need to track references to geometry parts (in geometry streams, line symbols, pattern symbols) while cloning geometry to prevent this.

Users facing this now must use the IModelDb.elementGeometryRequest API to check for used geometry parts themselves, and not import them, but the transformer should start doing this in its own native geometry cloning routine.

[timlawrence-bentley]

Hi Michael, is there an estimate on when this fix will be available? This has come up as a paid prod issue labeled as high priority and the client has been asking about this.
Thanks,
Tim

[MichaelBelousov]

Hi Michael, is there an estimate on when this fix will be available? This has come up as a paid prod issue labeled as high priority and the client has been asking about this. Thanks, Tim

The estimate I gave when I was asked monday was 3-4 weeks. Please contact me if you think that is an issue.

[MichaelBelousov]

Going to fix this in 2 phases:

• temporary internal fix prunes geometry after transformation, clean up excess geometry parts alpha API #115, deployed for testing as @itwin/imodel-transformer@0.3.3-prune-geom-parts.0
• longer term fix rewrite native geometry processing to record references as it goes, which will go hand-in-hand with the refactor of all native geometry processing