Stepped Modifier has no relation to the project frame rate #85101

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Edgar Huebert · 2021-01-27T11:20:48+01:00

Edgar Huebert commented

2021-01-27 11:20:48 +01:00

System Information
Operating system: Windows
Graphics card: RTX 3090

Blender Version
Broken: 2.91.2

Short description of error
Stepped modifier only modifies the frame rate of the original video and has no relation to the frame rate of the project.

The problem is simple. As soon as the time of an animation track is manipulated in a non-linear editor, the stepped modifire will run asynchronously to the other animations. If import animations with different frame rates: Rococo 100FPS, Mixamo 24, 25, 30, 60 FPS. There is no way to synchronize the stepped modifire with all animations, as they refer to the internal frame rate of the animation. There has to be a solution here so that you can choose whether the Modifre should work relatively or absolutely. In my case it makes more sense to relate the modifier to the frame rate of the project, because its allway constant. With the offset, its than possible to shift stepped animations in a precision way.

Thank you and best regards

Exact steps for others to reproduce the error
As usual I will put a Blender File as a attachment.

build two cubes
move both cubes in one axis and set start and end keyframes.
push down both animations in the non-linear editor.
apply stepped modifier to both animations and set a step size of 4.
scale the playback scale of one of the cubes.
In the viewport you can see that the scaled cube is displayed every 2 frames instead of every 4th like the other.

File:
BUG report_stepped.blend

**System Information** Operating system: Windows Graphics card: RTX 3090 **Blender Version** Broken: 2.91.2 **Short description of error** Stepped modifier only modifies the frame rate of the original video and has no relation to the frame rate of the project. The problem is simple. As soon as the time of an animation track is manipulated in a non-linear editor, the stepped modifire will run asynchronously to the other animations. If import animations with different frame rates: Rococo 100FPS, Mixamo 24, 25, 30, 60 FPS. There is no way to synchronize the stepped modifire with all animations, as they refer to the internal frame rate of the animation. There has to be a solution here so that you can choose whether the Modifre should work relatively or absolutely. In my case it makes more sense to relate the modifier to the frame rate of the project, because its allway constant. With the offset, its than possible to shift stepped animations in a precision way. Thank you and best regards **Exact steps for others to reproduce the error** As usual I will put a Blender File as a attachment. - build two cubes - move both cubes in one axis and set start and end keyframes. - push down both animations in the non-linear editor. - apply stepped modifier to both animations and set a step size of 4. - scale the playback scale of one of the cubes. - In the viewport you can see that the scaled cube is displayed every 2 frames instead of every 4th like the other. File: [BUG report_stepped.blend](https://archive.blender.org/developer/F9600246/BUG_report_stepped.blend)

Edgar Huebert commented

2021-01-27 11:20:48 +01:00

Added subscriber: @Edgar_Hu

Robert Guetzkow commented

2021-01-27 12:19:44 +01:00

Added subscriber: @rjg

Robert Guetzkow commented

2021-01-27 12:19:44 +01:00

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

Robert Guetzkow closed this issue

2021-01-27 12:19:44 +01:00

Robert Guetzkow commented

2021-01-27 12:19:44 +01:00

Thank you for your report. Unfortunately, this appear to be a feature request which are off-topic on the bug tracker. While this may be a useful addition for the NLA, it does not appear to be a bug in the current implementation.

Please use one of our websites listed in the [User Feedback and Request ]] section to create a post about the issue instead. [ https:*blender.community/c/rightclickselect/ | Right-click select would be the correct page for feature proposals.

Thank you for your report. Unfortunately, this appear to be a feature request which are off-topic on the bug tracker. While this may be a useful addition for the NLA, it does not appear to be a bug in the current implementation. Please use one of our websites listed in the [User Feedback and Request ]] section to create a post about the issue instead. [[ https:*blender.community/c/rightclickselect/ | Right-click select ](https:*wiki.blender.org/wiki/Communication/Contact#User_Feedback_and_Requests) would be the correct page for feature proposals.

Falk David commented

2021-01-27 12:41:34 +01:00

Added subscriber: @filedescriptor

Falk David commented

2021-01-27 12:41:34 +01:00

@Edgar_Hu To clarify what is going on here have a look at the manual: https://docs.blender.org/manual/en/latest/editors/nla/properties_modifiers.html#active-strip

It states that

Frame Start, End: The boundaries of the strip itself. Note that this will stretch the duration of the Action, it will not cause greater or fewer keyframes from the Actions to play.

So this means that if your action originally had 24 frames and you set the end frame to 12 then the action will simply play twice as fast. With the modifier, this means that the cube will move every 2 frames. This is not what we want.

In the Action Clip settings we can specify end frame of the action. If we set both the strip and action end frame to 12 our Playback Scale is 1.0 and the cube will move every 4 frames.

So to sum things up: The stepped modifier frame value is related to the frame rate of the scene, but scaled by the playback scale of the action.
Hope that clears things up.

@Edgar_Hu To clarify what is going on here have a look at the manual: https://docs.blender.org/manual/en/latest/editors/nla/properties_modifiers.html#active-strip It states that > Frame Start, End: The boundaries of the strip itself. Note that this will stretch the duration of the Action, it will not cause greater or fewer keyframes from the Actions to play. So this means that if your action originally had 24 frames and you set the end frame to 12 then the action will simply play twice as fast. With the modifier, this means that the cube will move every 2 frames. This is not what we want. In the *Action Clip* settings we can specify end frame of the *action*. If we set both the strip and action end frame to 12 our *Playback Scale* is 1.0 and the cube will move every 4 frames. So to sum things up: The stepped modifier frame value is related to the frame rate of the scene, *but scaled by the playback scale of the action*. Hope that clears things up.

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Stepped Modifier has no relation to the project frame rate #85101