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Maniphest T73254

Drivers with the object.dimension variable are not updated
Closed, ResolvedPublicBUG
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Description

Blender Version
Broken: version: 2.83
Worked: 2.79b

Short description of error
The bounding box(dimensions) updating with delay in drivers.

Exact steps for others to reproduce the error

  1. Open:
    Bouding_box_update_delay.blend569 KBDownload
  2. Select the box.
  3. Change the x dimension of the box (Note that the cylinder is updated).
  4. Select the cylinder.
  5. Go to the drivers.
  6. Remove the dummy variable.
  7. Change the x dimension of the box (Note that the cylinder is not updated).

Also, I create a topic on blenderarist.com with ideas for better driver workflow. Please check them.
Drivers update -topic

Revisions and Commits

rB Blender
D7031rB7d9a5b7b10b4 Fix T73254: Drivers with the object.dimension variable are not updated

Related Objects

Event Timeline

Vasil (FeralMan) created this task.Jan 20 2020, 10:38 AM
Vasil (FeralMan) updated the task description. (Show Details)
Germano Cavalcante (mano-wii) changed the task status from Needs Triage to Confirmed.EditedJan 22 2020, 1:23 PM
Germano Cavalcante (mano-wii) changed the subtype of this task from "Report" to "Bug".
Germano Cavalcante (mano-wii) added a subscriber: Germano Cavalcante (mano-wii).

I can confirm.

The file has a dependency cycle with the x dimension of the cylinder. (it is not related to the bug but would be nice to avoid it):

Dependency cycle detected:
  OBCylinder/Parameters Component/DRIVER(modifiers["Array"].constant_offset_displace) depends on
  OBCylinder/Geometry Component/GEOMETRY_EVAL() via 'RNA Target -> Driver'
  OBCylinder/Geometry Component/GEOMETRY_EVAL_INIT() via 'Object Geometry UberEval'
  OBCylinder/Parameters Component/DRIVER(modifiers["Array"].constant_offset_displace) via 'Driver -> Driven Property'
Detected 1 dependency cycles

The problem is not seen in blender 2.79
It is interesting to note that if you add a location variable even without adding to the expression the problem seems to be solved.

Germano Cavalcante (mano-wii) renamed this task from Bounding box delay to Drivers with the object.dimension variable are not updated.Jan 22 2020, 1:26 PM
Germano Cavalcante (mano-wii) updated the task description. (Show Details)
Germano Cavalcante (mano-wii) added projects: Animation & Rigging, Dependency Graph.
ML (spawn_x) added a subscriber: ML (spawn_x).Jan 23 2020, 10:36 PM
Sybren A. Stüvel (sybren) moved this task from Backlog to Bugs on the Animation & Rigging board.Feb 17 2020, 5:41 PM
Germano Cavalcante (mano-wii) updated the task description. (Show Details)Mar 3 2020, 4:20 PM

Updated the description and removed the dependency cycle in the file.

Germano Cavalcante (mano-wii) updated the task description. (Show Details)Mar 3 2020, 4:24 PM
Sybren A. Stüvel (sybren) claimed this task.Mar 5 2020, 11:48 AM
Sybren A. Stüvel (sybren) mentioned this in D7031: Fix T73254: Drivers with the object.dimension variable are not updated.Mar 5 2020, 5:40 PM
Sybren A. Stüvel (sybren) closed this task as Resolved by committing rB7d9a5b7b10b4: Fix T73254: Drivers with the object.dimension variable are not updated.Mar 6 2020, 11:10 AM
Sybren A. Stüvel (sybren) added a commit: rB7d9a5b7b10b4: Fix T73254: Drivers with the object.dimension variable are not updated.