Curvature / handles of spline-based mask aren't deformed properly when parented to a plane track #97239

New Issue

Simon Harfst · 2022-04-11T09:37:54+02:00

Simon Harfst commented

2022-04-11 09:37:54 +02:00

System Information
Operating system: Windows 11
Graphics card: RTX 550

Blender Version
Broken: 3.1.0
Worked: 3.1.0

Short description of error
Curvature / handles of spline-based masked aren't deformed properly when parented to a plane track

Exact steps for others to reproduce the error

create plane track
draw spline-based mask inside plane track (e.g. circle)
parent mask to plane track
run a few frames forward

handles / curvature aren't deformed properly
mask extends / swells out of plane

If a handle is transformed, it "snaps into place".

Reason for this is the default Auto type handles. In case of Auto, they are always recalculated, even after the plane track matrix has already been applied to them.
Transforming a handle will change its handle type (not Auto anymore), thus no recalculation will happen anymore (just the plane track matrix).

see attached PDF

handles_mask_plane_track.pdf

**System Information** Operating system: Windows 11 Graphics card: RTX 550 **Blender Version** Broken: 3.1.0 Worked: 3.1.0 **Short description of error** Curvature / handles of spline-based masked aren't deformed properly when parented to a plane track **Exact steps for others to reproduce the error** 1) create plane track 2) draw spline-based mask inside plane track (e.g. circle) 3) parent mask to plane track 4) run a few frames forward handles / curvature aren't deformed properly mask extends / swells out of plane If a handle is transformed, it "snaps into place". Reason for this is the default `Auto` type handles. In case of `Auto`, they are always recalculated, even after the plane track matrix has already been applied to them. Transforming a handle will change its handle type (not `Auto` anymore), thus no recalculation will happen anymore (just the plane track matrix). > see attached PDF [handles_mask_plane_track.pdf](https://archive.blender.org/developer/F12994727/handles_mask_plane_track.pdf)

Simon Harfst commented

2022-04-11 09:37:54 +02:00

Added subscriber: @Simon-Harfst

Simon Harfst changed title from ~~Curvature / handles of spline-based masked aren't deformed properly when parented to a plane track~~ to Curvature / handles of spline-based mask aren't deformed properly when parented to a plane track

2022-04-11 09:48:55 +02:00

Philipp Oeser commented

2022-04-11 15:34:09 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-04-11 15:34:09 +02:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Philipp Oeser commented

2022-04-11 15:34:09 +02:00

Broken: 3.1.0
Worked: 3.1.0

It is broken when? and worked when?

Please always attach a minimal example .blend file that demonstrates the issue.

> Broken: 3.1.0 > Worked: 3.1.0 It is broken when? and worked when? Please always attach a minimal example .blend file that demonstrates the issue.

Simon Harfst commented

2022-04-11 16:18:05 +02:00

Sorry, the "broken / worked" statement was a mistake by me.
I just tried it with 3.1.0.
I don't know if it ever worked...

I showed the issue in the attached PDF file (first post).
In this post I attached the corresponding .blend-file; the movie-file is not attached (it's MVI_4182.MOV from the Track, Match, Blend series at BlenderStudio).

Thanx for your help in advance.

track_mask.blend

Sorry, the "broken / worked" statement was a mistake by me. I just tried it with 3.1.0. I don't know if it ever worked... I showed the issue in the attached PDF file (first post). In this post I attached the corresponding .blend-file; the movie-file is not attached (it's MVI_4182.MOV from the Track, Match, Blend series at BlenderStudio). Thanx for your help in advance. [track_mask.blend](https://archive.blender.org/developer/F12995858/track_mask.blend)

Philipp Oeser commented

2022-04-26 09:32:37 +02:00

Sorry this took a bit to answer.
What I still dont quite understand is this part

interestingly: when clicking on a (not correctly deformed) handle-point, it snaps to the right position

Can you show this in action? This does not seem to happen on my side

Sorry this took a bit to answer. What I still dont quite understand is this part > interestingly: when clicking on a (not correctly deformed) handle-point, it snaps to the right position Can you show this in action? This does not seem to happen on my side

Philipp Oeser commented

2022-04-26 09:40:59 +02:00

Changed status from 'Needs User Info' to: 'Confirmed'

Philipp Oeser self-assigned this 2022-04-26 09:40:59 +02:00

Philipp Oeser commented

2022-04-26 09:40:59 +02:00

Ah, get it now, it snaps into place when such a handle is transformed.

Will check on this since I recently fixed #97135 and #85467

Ah, get it now, it snaps into place when such a handle is **transformed**. Will check on this since I recently fixed #97135 and #85467

Philipp Oeser commented

2022-04-26 12:34:51 +02:00

Changed status from 'Confirmed' to: 'Needs Developer To Reproduce'

Philipp Oeser commented

2022-04-26 12:34:51 +02:00

Hm, OK so the reason this happens is that the handles are set to type Auto, and if these are set to Auto, well... they are recalculated even after the plane track matrix has been applied to them, see https://developer.blender.org/diffusion/B/browse/master/source/blender/blenkernel/intern/mask_evaluate.c$898

So workaround is to set the Handle Type to e.g. Free or Aligned or Aligned Single (after initial setup), then this also works nicely with the plane track without swelling out of place.
Will ask around if we should possibly ignore the handle recalculation if mask is deformed by a plane track (or if there is another better solution or if this is just something to keep in mind when working with plane tracks).

Hm, OK so the reason this happens is that the handles are set to type `Auto`, and if these are set to `Auto`, well... they are recalculated even after the plane track matrix has been applied to them, see https://developer.blender.org/diffusion/B/browse/master/source/blender/blenkernel/intern/mask_evaluate.c$898 So workaround is to set the Handle Type to e.g. `Free` or `Aligned` or `Aligned Single` (after initial setup), then this also works nicely with the plane track without swelling out of place. Will ask around if we should possibly ignore the handle recalculation if mask is deformed by a plane track (or if there is another better solution or if this is just something to keep in mind when working with plane tracks).

Philipp Oeser removed their assignment 2022-04-26 12:48:50 +02:00

Philipp Oeser commented

2022-04-26 12:48:50 +02:00

Added subscriber: @Sergey

Philipp Oeser commented

2022-04-26 12:48:50 +02:00

Talked to @Sergey, this is not considered a bug for now, but might see improvement in the near future (in that it is appealing to handle plane track differently here in concert with mask handles).

Simon Harfst commented

2022-04-26 17:42:46 +02:00

Somehow strange to declare an obvious malfunction not as a bug... )-;
it's just not doing what it is supposed to do...

Somehow strange to declare an obvious malfunction not as a bug... )-; it's just not doing what it is supposed to do...

Germano Cavalcante commented

2022-04-26 23:34:59 +02:00

Changed status from 'Needs Developer To Reproduce' to: 'Confirmed'

Philipp Oeser removed the

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Curvature / handles of spline-based mask aren't deformed properly when parented to a plane track #97239