Parts orientation shifting

Being a developer for a railroad game, track alignment is a major thing that must be perfectly accurate. We make sure its as accurate as possible, but recently, we’ve noticed our track’s orientation shifting with a difference of about .003.

Studio

Game (Same location)

This could be due to the rail’s anchoring, go to the studio and check if the rail has the anchor set to true

I’ve heard of this a few times. Are you using TeamCreate? 0.001 and 0.002 studs auto movement issue

I also noticed it (probably in 2012/2013) when I was trying to make a long runway. It had a slight crown in the middle of the width of the runway (IRL this is for water drainage). In studio it was perfectly fine, but when I tested it the tiny variation of the angle from exactly 0,0,0 caused issues.

If you take the Orientation of a long Part in Studio and align it to another Part, then change the Y world axis value from 0.000 to 0.0004 (yes, 4 decimal places can be typed in!) It’ll round to 0.000 in the Properties window, but you’ll visibly see the change in orientation in the Workspace.

Yes I’m in team create. That is interesting that 4 places can be typed in but it rounds up.

Yes, the rails are anchored. If they weren’t, I would’ve found out a month ago when we ran a train over them lol.

Could you please provide a minimal repro RBXL? We suspect this is due to compression of orientation data, but we would like to verify this hypothesis.