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Buffering of nodeGroups is not working correctly
Confirmed, NormalPublicBUG

Description

System Information
Operating system: Fedora 31 (5.3.16-300.fc31.x86_64)
Graphics card: Intel Corporation UHD Graphics 620 (rev 07)
NVIDIA Corporation GP108M [GeForce MX150] (rev a1)

Blender Version
Broken: 2.81
Worked: (optional)

Short description of error
In compositing mode, when connecting output of a Value node to Y input of Translate node, every thing works as expected.
But when putting the Value node to a group and enables the Buffer Groups, connecting the output of group (which is output of Value node inside it) to Y input of Translate node does not works as expected!

Exact steps for others to reproduce the error
Open:

  • F12 to update.
  • Note that the Buffer Groups option is enabled (SideBar).
  • Note that by disabling this option and updating the tree, node group will work again.

Event Timeline

Germano Cavalcante (mano-wii) changed the task status from Needs Triage to Confirmed.Tue, Jan 7, 7:13 PM
Germano Cavalcante (mano-wii) changed the subtype of this task from "Report" to "Bug".Tue, Jan 7, 7:22 PM

I created almost the same setup in a new blend file, and everything works as expected. It seems there should be something to do with this file itself!

On further investigation, this is a problem with Buffer Groups:
https://docs.blender.org/manual/en/latest/compositing/properties.html#performance

It seems that the node group buffer in the example is created but not written.

Germano Cavalcante (mano-wii) renamed this task from Integer output of nodeGroup is not working correctly to Buffering of nodeGroups is not working correctly.Tue, Jan 7, 8:30 PM
Germano Cavalcante (mano-wii) updated the task description. (Show Details)

On further investigation, this is a problem with Buffer Groups:
https://docs.blender.org/manual/en/latest/compositing/properties.html#performance
It seems that the node group buffer in the example is created but not written.

Aha, yeas. Thanks for your help.