Correcting motion drift angle calculation.
Correcting motion drift angle calculation.

The motion drift and viewing angle subtraction should be done with relative angles, not absolute.

edgarriba/OpenSfM,NicWayand/OpenSfM,sunbingfengPI/OpenSFM_Test,sunbingfengPI/OpenSFM_Test,edgarriba/OpenSfM,oscarlorentzon/OpenSfM,edgarriba/OpenSfM,mapillary/OpenSfM,mapillary/OpenSfM,BrookRoberts/OpenSfM,NicWayand/OpenSfM,oscarlorentzon/OpenSfM,BrookRoberts/OpenSfM,onecue/OpenSfM,onecue/OpenSfM,sunbingfengPI/OpenSFM_Test,oscarlorentzon/OpenSfM,onecue/OpenSfM,BrookRoberts/OpenSfM,NicWayand/OpenSfM,NicWayand/OpenSfM,edgarriba/OpenSfM,BrookRoberts/OpenSfM,oscarlorentzon/OpenSfM,mapillary/OpenSfM,sunbingfengPI/OpenSFM_Test,edgarriba/OpenSfM,mapillary/OpenSfM,BrookRoberts/OpenSfM,oscarlorentzon/OpenSfM,NicWayand/OpenSfM,sunbingfengPI/OpenSFM_Test,onecue/OpenSfM,onecue/OpenSfM,mapillary/OpenSfM