transformation -> origin act weird when the strip is scaled #97986

New Issue

hamza.SMA · 2022-05-09T16:41:05+02:00

hamza.SMA commented

2022-05-09 16:41:05 +02:00

System Information
Operating system: Windows-10-10.0.19043-SP0 64 Bits
Graphics card: NVIDIA GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.39

Blender Version
Broken: version: 3.2.0 Beta, branch: master, commit date: 2022-05-02 20:13, hash: 62ef1c08af
Worked: (newest version of Blender that worked as expected)

Short description of error
origin of strips act inecpected when the strip is scaled .so the origin position consider the actual size( scale ) of the strip and adapt to the scale value for for keyframe purpose (to animate the origin when and where it needed ).

Exact steps for others to reproduce the error
2022-05-09 15-27-40.mp4

**System Information** Operating system: Windows-10-10.0.19043-SP0 64 Bits Graphics card: NVIDIA GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 472.39 **Blender Version** Broken: version: 3.2.0 Beta, branch: master, commit date: 2022-05-02 20:13, hash: `62ef1c08af` Worked: (newest version of Blender that worked as expected) **Short description of error** origin of strips act inecpected when the strip is scaled .so the origin position consider the actual size( scale ) of the strip and adapt to the scale value for for keyframe purpose (to animate the origin when and where it needed ). **Exact steps for others to reproduce the error** [2022-05-09 15-27-40.mp4](https://archive.blender.org/developer/F13061131/2022-05-09_15-27-40.mp4)

hamza.SMA commented

2022-05-09 16:41:05 +02:00

Added subscriber: @hamza-el-barmaki

Omar Emara commented

2022-05-10 09:21:17 +02:00

Added subscriber: @OmarEmaraDev

Omar Emara commented

2022-05-10 09:21:17 +02:00

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

Omar Emara commented

2022-05-10 09:21:17 +02:00

I am not sure what is unexpected about this exactly. This is essentially analogous to scaling a plane with its origin not at the center, in this case, it might seem that it moves upon scaling, but it is actually just scaled unproportionally making the illusion of movement. For instance, if the origin is at the the far left, scaling will happen by having the far right corner points to move away from the origin, and vice versa for the far right.
Or am I missing something?

I am not sure what is unexpected about this exactly. This is essentially analogous to scaling a plane with its origin not at the center, in this case, it might seem that it moves upon scaling, but it is actually just scaled unproportionally making the illusion of movement. For instance, if the origin is at the the far left, scaling will happen by having the far right corner points to move away from the origin, and vice versa for the far right. Or am I missing something?

hamza.SMA commented

2022-05-10 09:59:19 +02:00

@OmarEmaraDev what i expecting is the origin don't make the plan (the image) move . if the plan is scaled so the origin must not always take original size and make it move

eg: frame1 : i sacled image to (0.6,0.6)and the positioned an image the top right corner ...
for frame 100 : i want to make the origin in buttom left corner to rotate the image only so what happen is the position of the image also change to the buttom left corner
which is undesired 2022-05-10 08-53-10.mp4
so origin option became useless when the image is scaled because undesired inpredicted changing position happens

@OmarEmaraDev what i expecting is the origin don't make the plan (the image) move . if the plan is scaled so the origin must not always take original size and make it move eg: frame1 : i sacled image to (0.6,0.6)and the positioned an image the top right corner ... for frame 100 : i want to make the origin in buttom left corner to rotate the image only so what happen is the position of the image also change to the buttom left corner which is undesired [2022-05-10 08-53-10.mp4](https://archive.blender.org/developer/F13064382/2022-05-10_08-53-10.mp4) so origin option became useless when the image is scaled because undesired inpredicted changing position happens

Omar Emara commented

2022-05-10 10:19:41 +02:00

The origin is designed so that it affects scaling as well, not just rotation. So it is expected that the strips will move. The alternative is to disregard the origin when scaling, which will limit the usability of the origin option.

hamza.SMA commented

2022-05-10 12:11:39 +02:00

@OmarEmaraDev i not against that is use full to have origin affect scale maybe i didn't explain it well ...... if we look to 3d modelling moving origin of a cube of a scaled object don't make the object change position unless we change xyz values ...so that the only issue i have

Omar Emara commented

2022-05-10 12:24:06 +02:00

@hamza-el-barmaki In modeling, operators are destructive, so when you change the origin of an object, Blender moves the object implicitly to do what you want. The same does not apply for VSE because the transformation are non-destructive, they are done on the fly, and you can technically move the object to compensate for the movement caused by the scaling.

The equivalent for VSE is to use destructive operators. For instance, by setting the pivot to 2D cursor, setting the 2D cursor to one of the corners and rotating, then putting it on the other corner and rotating, leaving the transform origin always at 0.5. Does that work for your use case?

@hamza-el-barmaki In modeling, operators are destructive, so when you change the origin of an object, Blender moves the object implicitly to do what you want. The same does not apply for VSE because the transformation are non-destructive, they are done on the fly, and you can technically move the object to compensate for the movement caused by the scaling. The equivalent for VSE is to use destructive operators. For instance, by setting the pivot to 2D cursor, setting the 2D cursor to one of the corners and rotating, then putting it on the other corner and rotating, leaving the transform origin always at 0.5. Does that work for your use case?

hamza.SMA commented

2022-05-10 12:24:11 +02:00

maybe to avoid problems we can create two origins (infuence points) (one dedicated to rotation (appear as tiny cercle )and the other for scalings and other things (appear as point )

hamza.SMA commented

2022-05-10 12:32:49 +02:00

In #97986#1355737, @OmarEmaraDev wrote:

The equivalent for VSE is to use destructive operators. For instance, by setting the pivot to 2D cursor, setting the 2D cursor to one of the corners and rotating, then putting it on the other corner and rotating, leaving the transform origin always at 0.5. Does that work for your use case?

don't work here a situation
2022-05-10 11-30-18.mp4

> In #97986#1355737, @OmarEmaraDev wrote: > > The equivalent for VSE is to use destructive operators. For instance, by setting the pivot to 2D cursor, setting the 2D cursor to one of the corners and rotating, then putting it on the other corner and rotating, leaving the transform origin always at 0.5. Does that work for your use case? don't work here a situation [2022-05-10 11-30-18.mp4](https://archive.blender.org/developer/F13064600/2022-05-10_11-30-18.mp4)

Omar Emara commented

2022-05-10 13:38:41 +02:00

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

Omar Emara closed this issue

2022-05-10 13:38:41 +02:00

Omar Emara commented

2022-05-10 13:38:41 +02:00

In #97986#1355738, @hamza-el-barmaki wrote:
maybe to avoid problems we can create two origins (infuence points) (one dedicated to rotation (appear as tiny cercle )and the other for scalings and other things (appear as point )

I guess you can add a proposal for this, but this should be handled outside of this bug report.

For user requests and feedback, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests

don't work here a situation

I can replicate that. This seems like a bug indeed. But since it is different from this report, I created a new report for it in #98015. So I will archive this one and lets continue this in that report.

> In #97986#1355738, @hamza-el-barmaki wrote: > maybe to avoid problems we can create two origins (infuence points) (one dedicated to rotation (appear as tiny cercle )and the other for scalings and other things (appear as point ) I guess you can add a proposal for this, but this should be handled outside of this bug report. For user requests and feedback, please use other channels: https://wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests > don't work here a situation I can replicate that. This seems like a bug indeed. But since it is different from this report, I created a new report for it in #98015. So I will archive this one and lets continue this in that report.

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transformation -> origin act weird when the strip is scaled #97986