NLA - Quaternion blending in "Add" mode should use quaternion math instead #47035

New Issue

Alexander KHozyashev · 2015-12-22T07:32:40+01:00

2015-12-22 07:32:40 +01:00

System Information
Win 10 (don't matter)

Blender Version
2.76b f337fea
Short description of error
I try use 2 action on 2 strip,
Blending: (main action - root and other basic bone) add (cycles action)
Now NLA (Active Strip)blending: add just use formul: x + y
W: 1.000 + W: 1.000 = 2.000
X: 0.200 + X: 0.200 = 0.400
Y: 0.200 + Y: 0.200 = 0.400
Z: 0.200 + Z: 0.200 = 0.400
Quaternion has something like that q = w + xi + yj + z*k :D

Exact steps for others to reproduce the error
Try hard anim with nla. :3

Ligth blend file with example: NLA.blend

**System Information** Win 10 (don't matter) **Blender Version** 2.76b f337fea **Short description of error** I try use 2 action on 2 strip, Blending: (main action - root and other basic bone) add (cycles action) Now NLA (Active Strip)blending: add just use formul: x + y W: 1.000 + W: 1.000 = 2.000 X: 0.200 + X: 0.200 = 0.400 Y: 0.200 + Y: 0.200 = 0.400 Z: 0.200 + Z: 0.200 = 0.400 Quaternion has something like that q = w + x*i + y*j + z*k :D **Exact steps for others to reproduce the error** Try hard anim with nla. :3 Ligth blend file with example: [NLA.blend](https://archive.blender.org/developer/F269994/NLA.blend)

Alexander KHozyashev commented

2015-12-22 07:32:40 +01:00

Changed status to: 'Open'

Sergey Sharybin was assigned by Alexander KHozyashev

2015-12-22 07:32:40 +01:00

Alexander KHozyashev commented

2015-12-22 07:32:40 +01:00

Added subscriber: @AleksandrKhozyashev

Bastien Montagne commented

2015-12-22 12:01:28 +01:00

Added subscribers: @JoshuaLeung, @Sergey, @mont29

Sergey Sharybin was unassigned by Bastien Montagne

2015-12-22 12:01:28 +01:00

Joshua Leung was assigned by Bastien Montagne

2015-12-22 12:01:28 +01:00

Bastien Montagne commented

2015-12-22 12:01:28 +01:00

@AleksandrKhozyashev please do not assign to random people like that - in fact, triaging and assigning bugs is a dev’s task.

@JoshuaLeung, I think this one is for you? Though this looks more like a feature request than really a bug, I kinda remember a similar report this year (someone requesting some specific interpolation for quaternion curves or something)…

@AleksandrKhozyashev please do not assign to random people like that - in fact, triaging and assigning bugs is a dev’s task. @JoshuaLeung, I think this one is for you? Though this looks more like a feature request than really a bug, I kinda remember a similar report this year (someone requesting some specific interpolation for quaternion curves or something)…

Sergey Sharybin commented

2015-12-30 11:07:52 +01:00

AFAIR, NLA doesn't distinguish different curves/actions and can't really do smart things for quats? In any case, @JoshuaLeung is the guy to ask :)

Joshua Leung commented

2016-01-12 12:59:30 +01:00

This is more of a TODO.

It's increasingly looking like we will need some special handling for things like quats and scale. Currently, no special handling is done for anything; so, each component of the quats are getting handled separately - as if they're just any other curve.

This is more of a TODO. It's increasingly looking like we will need some special handling for things like quats and scale. Currently, no special handling is done for anything; so, each component of the quats are getting handled separately - as if they're just any other curve.

Joshua Leung changed title from ~~NLA quaternion bug~~ to NLA - Quaternion blending in "Add" mode should use quaternion math instead

2016-01-12 13:01:15 +01:00

Jack Andersen commented

2016-04-30 06:13:43 +02:00

Added subscriber: @JackAndersen

Jack Andersen commented

2016-04-30 06:13:44 +02:00

D1929 adds a code path for gathering quaternions on a per-strip basis. It's specifically designed to sample explicitly-keyed timed points surrounding the evaluated strip-time.

After interpolating with SLERP/SQUAD, the proposed quaternion math is implemented for blending tracks.

This same code path could be made to evaluate direct nlerp via the fcurves, instead of the 2x or 4x evaluations for SLERP/SQUAD

[D1929](https://archive.blender.org/developer/D1929) adds a code path for gathering quaternions on a per-strip basis. It's specifically designed to sample explicitly-keyed timed points surrounding the evaluated strip-time. After interpolating with SLERP/SQUAD, the proposed quaternion math is implemented for blending tracks. This same code path could be made to evaluate direct nlerp via the fcurves, instead of the 2x or 4x evaluations for SLERP/SQUAD

Sybren A. Stüvel commented

2019-12-06 13:28:04 +01:00

Added subscriber: @dr.sybren

Sybren A. Stüvel commented

2019-12-06 13:28:04 +01:00

I'm moving this task from the 'Planned/Scheduled' to the 'Postponed' workboard, since there is no plan/schedule, and it's been idle for almost three years.

Sybren A. Stüvel commented

2020-10-27 10:37:05 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Sybren A. Stüvel closed this issue

2020-10-27 10:37:05 +01:00

Sybren A. Stüvel commented

2020-10-27 10:37:05 +01:00

This seems to have been fixed in D4190: NLA: implement a new blending mode that intelligently overlays actions.. If there is still an issue in this area, please file a new bug report.

This seems to have been fixed in [D4190: NLA: implement a new blending mode that intelligently overlays actions.](https://archive.blender.org/developer/D4190). If there is still an issue in this area, please file a new bug report.

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NLA - Quaternion blending in "Add" mode should use quaternion math instead #47035