I thought the horizontal bar in the Action Editor/Dope Sheet is drawn when two keyframes are identical. In my case I have keyframes with different values, but the horizontal line is still drawn.
In the pictures below you can see that rotation values are different, but the horizontal bar is still drawn between keyframes:
enter image description here enter image description here

  • $\begingroup$ I don't know, but it doesn't have the same thickness that the classical grey line though $\endgroup$
    – moonboots
    Mar 9, 2019 at 10:40
  • $\begingroup$ Maybe it's because of the theme that I'm using. I'm suing "default++" theme, maybe it affects the thickness? $\endgroup$
    – blablaalb
    Mar 9, 2019 at 10:44
  • $\begingroup$ I mean look at its thickness after frame 13, it changes, same thing between frame 1 and 4, not the same thickness than between 6 and 13, so what does it mean? :/ $\endgroup$
    – moonboots
    Mar 9, 2019 at 11:07
  • $\begingroup$ I have no idea :/ $\endgroup$
    – blablaalb
    Mar 9, 2019 at 11:09
  • $\begingroup$ It might have something to do with the fact you've keyframed everything about the bone and say the transform and scale is still the same but the rotations are different. Other than that, I'm not sure. Perhaps try removing all key frames and just keying rotation values? If that's what you did anyway, then I'm at a loss... $\endgroup$ Mar 9, 2019 at 12:15


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