Rotation stabilization using wrong anchor point #95291

New Issue

Björn Eckhardt · 2022-01-28T17:52:52+01:00

Björn Eckhardt commented

2022-01-28 17:52:52 +01:00

System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 496.49

Blender Version
Broken: version: 3.0.1, branch: master, commit date: 2022-01-25 17:19, hash: dc2d180181
Worked: (newest version of Blender that worked as expected)

Short description of error
When stabilzing (location and) rotation with subsequentials pairs of tracks, blender seems to use the anchorpoint of the very first track pair instead of the one that is active in that segment of the film. At least this behavior is different to the way location stabilizing works.

Exact steps for others to reproduce the error

load a movie clip in movieclip editor
track 2 tracks a bit
go one frame further and track 2 more (that both trackpairs don't overlap)
activate stabilzilizing (as well in viewer)
add one of a pair in locationstabilzinglist, add the other one to rotation stabilzing list)

turn rotation stabilizing off and set expected size to 1 --> at the startframe (default anchor) of each pair the film covers the whole frame
turn rotation on --> at the start of pair 2 both tracks have the same angle as the first pair on their anchor

I would expect that the second pair should start with their initial angle in the film (without the film rotated). But maybe thats not the intended use and I'm missing something.

Here is my testfile and video: (https://www.dropbox.com/sh/k89iq5hzj2xq953/AAAMP6HyILGdIeR1D0s_5hYya?dl=0)
RotationStab-Bug.blend
RoationTest_vid.mp4

thanks for looking into it
regards
Björn

**System Information** Operating system: Windows-10-10.0.19043-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 496.49 **Blender Version** Broken: version: 3.0.1, branch: master, commit date: 2022-01-25 17:19, hash: `dc2d180181` Worked: (newest version of Blender that worked as expected) **Short description of error** When stabilzing (location and) rotation with subsequentials pairs of tracks, blender seems to use the anchorpoint of the very first track pair instead of the one that is active in that segment of the film. At least this behavior is different to the way location stabilizing works. **Exact steps for others to reproduce the error** - load a movie clip in movieclip editor - track 2 tracks a bit - go one frame further and track 2 more (that both trackpairs don't overlap) - activate stabilzilizing (as well in viewer) - add one of a pair in locationstabilzinglist, add the other one to rotation stabilzing list) 1. turn rotation stabilizing off and set expected size to 1 --> at the startframe (default anchor) of each pair the film covers the whole frame 2. turn rotation on --> at the start of pair 2 both tracks have the same angle as the first pair on their anchor I would expect that the second pair should start with their initial angle in the film (without the film rotated). But maybe thats not the intended use and I'm missing something. Here is my testfile and video: (https://www.dropbox.com/sh/k89iq5hzj2xq953/AAAMP6HyILGdIeR1D0s_5hYya?dl=0) [RotationStab-Bug.blend](https://archive.blender.org/developer/F12837382/RotationStab-Bug.blend) [RoationTest_vid.mp4](https://archive.blender.org/developer/F12837381/RoationTest_vid.mp4) thanks for looking into it regards Björn

Björn Eckhardt commented

2022-01-28 17:52:52 +01:00

Added subscriber: @BjornEckhardt

Germano Cavalcante commented

2022-01-31 15:10:55 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2022-01-31 15:10:55 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Germano Cavalcante commented

2022-01-31 15:10:55 +01:00

In fact, although the location follows the original position of the track, the rotation (and the scale) seems to suffer a kind of offset.

I'm not familiar with this though.

In fact, although the location follows the original position of the track, the rotation (and the scale) seems to suffer a kind of offset. ![GIF.gif](https://archive.blender.org/developer/F12837354/GIF.gif) *I'm not familiar with this though.*

Philipp Oeser commented

2022-01-31 15:26:18 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-01-31 15:26:18 +01:00

Has this worked in a previous release? https://download.blender.org/release/

Björn Eckhardt commented

2022-01-31 17:15:35 +01:00

The oldest blender version I have available right now is 2.81 and it shows the same behavior as the current versions. Seems to be an old bug.

Björn Eckhardt commented

2022-02-02 14:20:38 +01:00

I tested the behavior on blender 2.70 (I'm happy to have forgotten those times) and it behaves differently:

at the start of the second pair of tracks (second anchor) the movie has the same rotation as the end of the first track pair

This behavior seems also reasonable, although I think having the rotation behave the same way as the location stabilization (new tracks --> new anchor, expected rotation and position is zero at the anchor point) makes more sense/is more consistent.

here is my 2.70 blend file
https://www.dropbox.com/s/lklp04jpbuuisdl/RotationStab-Bug_2-70.blend?dl=0

I tested the behavior on blender 2.70 (I'm happy to have forgotten those times) and it behaves differently: - at the start of the second pair of tracks (second anchor) the movie has the same rotation as the end of the first track pair This behavior seems also reasonable, although I think having the rotation behave the same way as the location stabilization (new tracks --> new anchor, expected rotation and position is zero at the anchor point) makes more sense/is more consistent. here is my 2.70 blend file https://www.dropbox.com/s/lklp04jpbuuisdl/RotationStab-Bug_2-70.blend?dl=0

Philipp Oeser removed the

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Rotation stabilization using wrong anchor point #95291