Drivers don't update while rendering an animation #78893

New Issue

Bent Hillerkus · 2020-07-13T19:26:32+02:00

Bent Hillerkus commented

2020-07-13 19:26:32 +02:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.48

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-11 18:41, hash: ee5c2f6ead
Tried: 2.83 releases, 2.82, 2.81, 2.80
Worked: 2.79 (had to recreate the file, but loading that one into 2.8 shows the same behaviour)

Short description of error
When using drivers to for example keep the scaling of an object proportional, the value change will be updated during

viewport playback (with a slight lack, implying stretching that isn't actually there)
single frame rendering (F+12)
viewport animation rendering
However when rendering an animation the drivers will not update and the object will appear stretched.

Frame 17 of an animation render (it happens on all, 17 is just as an example)

Frame 17 rendered by rendering a single frame when the playhead is on frame 17

Exact steps for others to reproduce the error

Animate the x-axis of a cube to scale (two single keyframes)
Copy that property as a driver and paste it to the y-axis and the z-axis

Render the animation (CRTL+F+12)

Only the x-axis will change, the others will have the value they had in the viewport at the time you've started the render.

driver bug.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 970/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 451.48 **Blender Version** Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-11 18:41, hash: `ee5c2f6ead` Tried: 2.83 releases, 2.82, 2.81, 2.80 Worked: 2.79 (had to recreate the file, but loading that one into 2.8 shows the same behaviour) **Short description of error** When using drivers to for example keep the scaling of an object proportional, the value change will be updated during - viewport playback (with a slight lack, implying stretching that isn't actually there) - single frame rendering (F+12) - viewport animation rendering However when rendering an animation the drivers will not update and the object will appear stretched. Frame 17 of an animation render (it happens on all, 17 is just as an example) ![image.png](https://archive.blender.org/developer/F8691837/image.png) Frame 17 rendered by rendering a single frame when the playhead is on frame 17 ![image.png](https://archive.blender.org/developer/F8691839/image.png) **Exact steps for others to reproduce the error** - Animate the x-axis of a cube to scale (two single keyframes) - Copy that property as a driver and paste it to the y-axis and the z-axis # Render the animation (CRTL+F+12) Only the x-axis will change, the others will have the value they had in the viewport at the time you've started the render. [driver bug.blend](https://archive.blender.org/developer/F8691746/driver_bug.blend)

Bent Hillerkus commented

2020-07-13 19:26:32 +02:00

Added subscriber: @bent

Bent Hillerkus commented

2020-07-13 20:02:09 +02:00

I got a friend to try this out and he faced the same issue.
[[ https://streamable.com/4noar7 | (video link)
]]

His system configuration:

gtx 1080, ryzen 2700x, 64gb ddr4/2933mhz```

I got a friend to try this out and he faced the same issue. [[ https://streamable.com/4noar7 | (video link) ]] His system configuration: ```v2.83.1, win10 2004, latest studio driver version gtx 1080, ryzen 2700x, 64gb ddr4/2933mhz```

Richard Antalik commented

2020-07-14 23:49:42 +02:00

Added subscriber: @iss

Richard Antalik commented

2020-07-14 23:49:42 +02:00

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

Richard Antalik closed this issue

2020-07-14 23:49:42 +02:00

Richard Antalik self-assigned this 2020-07-14 23:49:42 +02:00

Richard Antalik commented

2020-07-14 23:49:42 +02:00

This is probably due to dependency cycles. You can see this error in console:

Dependency cycle detected:
  OBCube/Transform Component/TRANSFORM_INIT() depends on
  OBCube/Parameters Component/DRIVER(scale) via 'Driver -> Driven Property'
  OBCube/Transform Component/TRANSFORM_FINAL() via 'RNA Target -> Driver'
  OBCube/Transform Component/TRANSFORM_SIMULATION_INIT() via 'Simulation -> Final Transform'
  OBCube/Transform Component/TRANSFORM_EVAL() via 'Transform Eval -> Simulation Init'
  OBCube/Transform Component/TRANSFORM_LOCAL() via 'Eval'
  OBCube/Transform Component/TRANSFORM_INIT() via 'Transform Init'
Dependency cycle detected:
  OBCube/Transform Component/TRANSFORM_INIT() depends on
  OBCube/Parameters Component/DRIVER(scale) via 'Driver -> Driven Property'
  OBCube/Transform Component/TRANSFORM_FINAL() via 'RNA Target -> Driver'
  OBCube/Transform Component/TRANSFORM_SIMULATION_INIT() via 'Simulation -> Final Transform'
  OBCube/Transform Component/TRANSFORM_EVAL() via 'Transform Eval -> Simulation Init'
  OBCube/Transform Component/TRANSFORM_LOCAL() via 'Eval'
  OBCube/Transform Component/TRANSFORM_INIT() via 'Transform Init'
Detected 2 dependency cycles

This is probably due to dependency cycles. You can see this error in console: ``` Dependency cycle detected: OBCube/Transform Component/TRANSFORM_INIT() depends on OBCube/Parameters Component/DRIVER(scale) via 'Driver -> Driven Property' OBCube/Transform Component/TRANSFORM_FINAL() via 'RNA Target -> Driver' OBCube/Transform Component/TRANSFORM_SIMULATION_INIT() via 'Simulation -> Final Transform' OBCube/Transform Component/TRANSFORM_EVAL() via 'Transform Eval -> Simulation Init' OBCube/Transform Component/TRANSFORM_LOCAL() via 'Eval' OBCube/Transform Component/TRANSFORM_INIT() via 'Transform Init' Dependency cycle detected: OBCube/Transform Component/TRANSFORM_INIT() depends on OBCube/Parameters Component/DRIVER(scale) via 'Driver -> Driven Property' OBCube/Transform Component/TRANSFORM_FINAL() via 'RNA Target -> Driver' OBCube/Transform Component/TRANSFORM_SIMULATION_INIT() via 'Simulation -> Final Transform' OBCube/Transform Component/TRANSFORM_EVAL() via 'Transform Eval -> Simulation Init' OBCube/Transform Component/TRANSFORM_LOCAL() via 'Eval' OBCube/Transform Component/TRANSFORM_INIT() via 'Transform Init' Detected 2 dependency cycles ```

Bent Hillerkus commented

2020-07-15 16:04:04 +02:00

Alright, I wasn't aware that these even exitst. I found the option to use single channels now.
These dependency cycles should put a warning inside the info editor & the status bar and bpy.ops.ui.copy_as_driver_button() should use the corresponding transform channel instead of "single property", if available.
Blender makes it too easy to make this mistake and pretty much hides it from the user until they try to render.
Is there a design task for drivers?

Alright, I wasn't aware that these even exitst. I found the option to use single channels now. These dependency cycles should put a warning inside the info editor & the status bar and `bpy.ops.ui.copy_as_driver_button()` should use the corresponding transform channel instead of "single property", if available. Blender makes it too easy to make this mistake and pretty much hides it from the user until they try to render. Is there a design task for drivers?

Bent Hillerkus commented

2020-07-15 16:56:18 +02:00

It's more complicated. Even transform channels only works in render when set to "transform" space. "local" and "world" space will not work.
driver_bug_redux.blend

The manual doesn't mention any of this and it's not happening in 2.79. Is this desired behaviour?

And the console isn't showing anything on dependency cycles when using any of the Transform Channel options, so it's either not detecting these as self references or the issue of the render looking different than the viewport is not directly related to dependency cycles, I guess.

It's more complicated. Even transform channels only works in render when set to "transform" space. "local" and "world" space will not work. [driver_bug_redux.blend](https://archive.blender.org/developer/F8697253/driver_bug_redux.blend) [The manual](https://docs.blender.org/manual/en/dev/animation/drivers/drivers_panel.html?highlight) doesn't mention any of this and it's not happening in 2.79. Is this desired behaviour? And the console isn't showing anything on dependency cycles when using any of the Transform Channel options, so it's either not detecting these as self references or the issue of the render looking different than the viewport is not directly related to dependency cycles, I guess.

Bent Hillerkus commented

2020-07-23 19:11:13 +02:00

@iss Can you have a look again re the unreported (?) dependency cycles? See my comment above

Richard Antalik commented

2020-07-24 05:07:44 +02:00

@bent Sorry I have missed your comment. I don't have clear or deep knowledge what these spaces really mean. Googling for at least brief explanation resulted in #39393. So I guess you could make new report, I am not really sure if it's a bug or not.

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Drivers don't update while rendering an animation #78893

Render the animation (CRTL+F+12)