Track To constraint makes object disappear #53455
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Reference: blender/blender#53455
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System Information
Win 7 64bit
Blender Version
Broken: 2.79
Worked: 2.78 (
fb1cd76
)Short description of error
Track To constraint on straight Z axis is inconsistent
Exact steps for others to reproduce the error
Load default scene, translate Cube to (0, 0, -1.7)
Clear Camera transforms (ALT G, ALT R)
Select Camera and then SHIFT click select Cube
Track (CTRL T) Camera to Cube and select Track To -> Camera shrinks to nothing
0001-0041.mp4
File is ready to press CTRL T
Camera_constraint.blend
Changed status to: 'Open'
Added subscriber: @SergeL
Added subscriber: @FloridaJo
Not seeing that here on macOS on either 2.79 release or latest buildbot.
Added subscriber: @Sergey
I can not reproduce the issue on neither Linux nor Windows 10, both 64 bit.
If so, please provide .blend file right before you click "Ctrl-T".
Updated first post with file and video.
Latest build and "load factory settings" doesn't help, but I've tried 2.78 (
fb1cd76
) and it works without problemsAdded subscriber: @JoshuaLeung
Can confirm on the provided file. This only seems to affect the "TrackTo" constraint, and not the "Damped Track" or "Locked Track"
Added subscriber: @lichtwerk
only happens when camera is exactly above the Cube on the Z-Axis (constraint works normally when you start moving the cube away from that axis)
Not sure why the constraint actually affects scaling at all... will have a look...
caused by
16fbb47c88
Changed status from 'Open' to: 'Resolved'
Thanks for tracking down the commit. This is quite an edge case - while the vector is normalized it's so close to zero to begin with, a second call is needed to make it really normalized (which fixes the bug).
Since this code was working beforehand, revert my change with comment on why.
This issue was referenced by
ac2ebf9c54