Proper return value for triangulation
Proper return value for triangulation

Change-Id: Idec911c2c0b0516cc1cc21e40de33ad728db9d1f

zhanshenman/TheiaSfM,zhanshenman/TheiaSfM,zhanshenman/TheiaSfM,zhanshenman/TheiaSfM,zhanshenman/TheiaSfM