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Driving object scale also scales its particle instances.
Confirmed, NormalPublicBUG

Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.92

Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: rB02948a2cab44
Worked: (newest version of Blender that worked as expected)

Short description of error
When scaling the object that the particles are on, everything works correctly, the particles stay at the same size they are supposed to.

But when driving the exact same scale variable with a driver, for some reason the particles get scaled.
The property has to be on another object than the particle system, when it's on the object with particle system, then everything works as expected.

Exact steps for others to reproduce the error

  • Open attached file
  • Change the 'prop' value (particle instances also get scaled)
  • Now select the object with the particles
  • Disable the driver
  • Scale in x direction (particles stay at the same size they are supposed to)

Pressing "Update Dependencies" fixes the scale, but in my real project that is unfeasible thing to do, I have many parameters that are driven that need to be animated and clicking them all through each time I make a tiny change is not possible. Also, rendering does not always fix the scales either.

Event Timeline

Erich Brutus (IEQI) updated the task description. (Show Details)
Erich Brutus (IEQI) updated the task description. (Show Details)
Erich Brutus (IEQI) updated the task description. (Show Details)
Germano Cavalcante (mano-wii) changed the task status from Needs Triage to Confirmed.Apr 14 2021, 11:05 PM
Germano Cavalcante (mano-wii) changed the subtype of this task from "Report" to "Bug".
This comment was removed by Germano Cavalcante (mano-wii).
Germano Cavalcante (mano-wii) renamed this task from Driving particle distribute object scale also scales particles. to Driving object scale also scales its particle instances..Fri, Apr 23, 4:13 PM
Germano Cavalcante (mano-wii) updated the task description. (Show Details)