Inserting new keyframe deletes previous ones #61173
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Reference: blender/blender#61173
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System Information
Operating system: Lubuntu (Linux)
Graphics card: GTI 1050i
Blender Version
Broken:
blender-2.80-8a51af7d1c98-linux-glibc224-x86_64
Short description of error
Addding a new keyframe sets back the other keyframed values to previous (see below)
Exact steps for others to reproduce the error
First I insert (in the "N"-panel) a keyframe for rotation, one for location and one for scale. Second I move further on in the timeline (dopesheet) and change some or all of these values and want to insert new keyframes for all the changed values. If I now add a keyframe for the first changed value (e.g. rotation) it automatically sets the other values back to the first keyframe values. Any fix planed on this?
Added subscriber: @CultLess
#59555 was marked as duplicate of this issue
Added subscribers: @brecht, @JacquesLucke
Can confirm this...
@brecht, maybe this is related to blender/blender-staging@83f8f44791?
Added subscriber: @ditos
I think it's the same Bug as here.
https://developer.blender.org/T59555
The whole keyframing in Blender seems to be completely confused at the moment.
Added subscriber: @s.barbieri
Added subscriber: @JoshuaLeung
What's probably happening in this case is as follows:
old_value
(i.e. SDNA value, unkeyed above) !=new_value
(i.e. result of animation evaluation, from F-Curves that don't know about this new value, as they don't have keyframes in place to enforce that yet). Hence, the values from the F-Curves get flushed back to SDNA, overwriting the unkeyed values.In 2.5, we avoided this scenario by making it so that animation evaluation only ever happened on frame change. In other words, if the frame doesn't change, animation evaluation doesn't happen to flush away unkeyed values.
AFAIK, right now doing a COW flush pretty much forces the evaluation of everything downstream from it (since we can't really know whether the change which necessitated the flush occurred because some value changed that other things need to rely on - e.g. a property's value changing after user interaction the UI). Thus, COW flushing often means that animation (+ proxy/override stuff) needs to re-run on top of these newly re-synced datablock(s) to get things in sync with the current frame again (just in case a particular COW/graph is looking at a different point in time).Closed as duplicate of #58721