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Camera rotation is inverted when camera is upside down in "fly navigation" mode
Open, Confirmed, LowPublic


System Information
Operating system: Linux-4.15.0-46-generic-x86_64-with-debian-buster-sid 64 Bits
Graphics card: GeForce GTX 960M/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 390.116

Blender Version
Broken version:

  • 2.80 (sub 51), branch: blender2.7, commit date: 2019-03-21 23:13, hash: rB1ae6aaad43ad
  • similar behavior on 2.79

Short description of error
Left-right rotation of camera in "Fly navigation" is inverted when camera is upside down and "upright Z axis" is off. This effect can be seen even if camera is slightly upside down (for example if you look in X-axis direction and rotate around Y-axis more than 90 degrees). Changing "upright Z axis" to ON fixes this issue even if camera is still upside down. Changing it back to OFF produces problem again. If "upright Z axis" is kept ON all the time, you can rotate camera UP to bring it upside down to see that problem only happens when "upright Z axis" is off.

I believe this is bug, because it is counterintuitive and different from behavior in same situation when "upright Z axis" is ON.

Exact steps for others to reproduce the error (blender 2.8, default shortcuts)

  • Open any blender scene.
  • Press F3 to open search dialog.
  • Search "Fly Navigation" and press Enter.
  • Press Z to turn off "Upright Z axis".
  • Rotate camera upside down (for example move cursor above rectangle in center of screen until camera is upside down).
  • Place cursor left of rectangle in center of screen. Camera should rotate left, but it rotates right. Alternatively, place cursor right of rectangle in center of screen.



Event Timeline

Sebastian Parborg (zeddb) triaged this task as Confirmed, Medium priority.
Brecht Van Lommel (brecht) lowered the priority of this task from Confirmed, Medium to Confirmed, Low.Mar 26 2019, 1:59 PM