Maniphest T76885

Animation Objects Move at Different Rates
Closed, Archived
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Assigned To
Richard Antalik (ISS)
Authored By
James R. Manchester (xjmanchester)
May 19 2020, 3:57 PM
Tags
  • BF Blender
Subscribers
James R. Manchester (xjmanchester)
Richard Antalik (ISS)

Description

System Information
Operating system: Windows 10 Build 18363.778
Graphics card: NVIDIA GeForce RTX 2060 SUPER Version 442.92

Blender Version
Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen)
Worked: (newest version of Blender that worked as expected) It has never worked for me but I've only used 2.80. I've tried it on 2.90 but it still fails.

Short description of error
When playing back the timeline from 0 to 90, the objects should move upward at the same speed but they don't which can be seen by watching the orange object at the top (Weight). When the timeline gets to 90, everything is back in sync.

test.blend189 KBDownload

Exact steps for others to reproduce the error
Press the play button and watch the weight. It (and others) move at a different rate. If you delete the keyframes at location 100 and replay the timeline, everything works correctly. Somehow the keyframes at 100 are influencing the process between 0 and 90.
Based on the default startup or an attached .blend file (as simple as possible).

Related Objects

Event Timeline

James R. Manchester (xjmanchester) created this task.May 19 2020, 3:57 PM
Richard Antalik (ISS) closed this task as Archived.May 19 2020, 4:26 PM
Richard Antalik (ISS) claimed this task.
Richard Antalik (ISS) added a subscriber: Richard Antalik (ISS).

When the timeline gets to 90, everything is back in sync

This doesn't happen when I preview the file

If you delete the keyframes at location 100 and replay the timeline, everything works correctly. Somehow the keyframes at 100 are influencing the process between 0 and 90.
Can not see this effect

The reason why objects are not moving at the same speed is, that all objects are children of Magnet object and you animate them all. Children will be moved along with parent.

James R. Manchester (xjmanchester) added a comment.May 19 2020, 5:53 PM

I'm not sure why you couldn't see the effect. I'm attaching a replacement .blend file without any children. I've lengthened the timeline. I think it'll be obvious now.

test.blend213 KBDownload

James R. Manchester (xjmanchester) mentioned this in T76924: Animation Objects Move at Different Rates.May 20 2020, 8:32 PM