Maniphest T52346

NLA: track extrapolation auto-changes and clear keyframe crashes blender
Closed, Resolved
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Assigned To
Joshua Leung (aligorith)
Authored By
¿? (edtion)
Aug 11 2017, 2:50 AM
Tags
  • BF Blender
  • Animation & Rigging
Subscribers
Bastien Montagne (mont29)
Brad Clark (RiggingDojo)
Joshua Leung (aligorith)
¿? (edtion)

Description

Window 7, GTX 770 oc

2.79rc 6af7d7e

Pressing Alt+I while hovering over a strip's Extrapolation value just crashes Blender.
Moving the strip causes the value to switch back to Hold.

In another file, I have a strip that's stuck in Hold Forward. No matter what I do, the tracks will only use Nothing or Hold Forward. If the box and changed to Hold any change (even temp/cancelled), will switch it back to Hold Forward (or None if that was set).

In this new example file, it's the opposite except if the value is set to Hold Forward, it will work and remain that until the strip is moved (temp/cancelled/permanent).

untitled.blend92 KBDownload

Revisions and Commits

rB Blender
rBe6da7bb75c8e Fix T52346: Alt-I (Delete Keyframes) on a NlaStrip's Extrapolate property would…

Related Objects

Mentioned In
T66946: NLA strip unexpectedly auto-switching from Hold to Hold Forward
Mentioned Here
rB6af7d7e05e31: Cleanup: remove incorrect comment

Event Timeline

¿? (edtion) created this task.Aug 11 2017, 2:50 AM
Bastien Montagne (mont29) assigned this task to Joshua Leung (aligorith).Aug 11 2017, 10:18 AM
Bastien Montagne (mont29) lowered the priority of this task from 90 to Normal.
Bastien Montagne (mont29) added subscribers: Joshua Leung (aligorith), Bastien Montagne (mont29).

@Joshua Leung (aligorith) is that kind of settings supposed to be animatable at all?

¿? (edtion) added a comment.Aug 11 2017, 11:01 AM

The Right-Click Menu says no but the hotkey says crash ^_^

.

Joshua Leung (aligorith) triaged this task as 50 priority.Aug 11 2017, 3:43 PM
Joshua Leung (aligorith) changed the task status from Unknown Status to Resolved by committing rBe6da7bb75c8e: Fix T52346: Alt-I (Delete Keyframes) on a NlaStrip's Extrapolate property would….Aug 11 2017, 3:53 PM
Joshua Leung (aligorith) added a commit: rBe6da7bb75c8e: Fix T52346: Alt-I (Delete Keyframes) on a NlaStrip's Extrapolate property would….
¿? (edtion) changed the task status from Resolved to Unknown Status.EditedAug 11 2017, 4:49 PM

This is actually two different problems.
Part 1 (the keyframe-crash) is/was a secondary concern.

Part 2 is the extrapolation mode (and the reason I tried part 1 in the first place).

Joshua Leung (aligorith) changed the task status from Unknown Status to Resolved.Aug 12 2017, 12:37 AM

Without a test file to demonstrate the sitaution where it's "stuck", I can't say for sure what's going on in that case.

However, in general, only the first strip in the timeline for a datablock gets set to Hold, while all others are set to Hold Forward or Nothing. This is done for the following reasons:

  • The very first strip must use Hold or else jumping to a point before that strip will not evaluate the pose, and things will go wonky
  • Strips on which you've manually set Nothing on are left alone. It's assumed that you asked for it in that case
  • Hold Forward is set on all others so that you won't add a new strip at the top of the stack that ends up completely blocking everything that came before.
Ovionis (Phigon) mentioned this in T66946: NLA strip unexpectedly auto-switching from Hold to Hold Forward.Jul 17 2019, 11:26 AM
Brad Clark (RiggingDojo) added a subscriber: Brad Clark (RiggingDojo).Mar 1 2022, 4:37 AM

Do we still need this "auto hold change" to keep the crash from happening? I and many others want it to not act this way and I would love to know if we can revert/get rid of it and not have it crash.