Fixed issue with identifying backfacing faces. #615

Job	Run time
call_workflow / Start self-hosted EC2 runner	2m 38s
call_workflow / Clone and build	4m 59s
call_workflow / Stop self-hosted EC2 runner	1m 8s
call_workflow / Publish to S3	16s
call_workflow / Upload artifacts to repo	29s
call_workflow / Run test suite	0s
	9m 30s

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