Depsgraph does not update #54002

New Issue

MWire · 2018-02-05T17:31:10+01:00

MWire commented

2018-02-05 17:31:10 +01:00

System Information
Windows 8.1, nvidia Geforce 920M

Blender Version
Broken: (2.79, 5bd8ac9)

Short description of error
This is a follow-up for bug ##53991
The driver for "ScaleX" does not update when "Driver Source" is altered
As stated by Sergey, it has something to do with "Depsgraph missing updates"

Exact steps for others to reproduce the error
Add a cycles material, create a driver in the node editor that takes input from any node variable within that material that uses the new dependency graph.
Nodebug_working.blend
Attached example is attempting to control ScaleX using the variable input node, using the dependency graph.

**System Information** Windows 8.1, nvidia Geforce 920M **Blender Version** Broken: (2.79, 5bd8ac9) **Short description of error** This is a follow-up for bug [##53991 ](https://developer.blender.org/T53991) The driver for "ScaleX" does not update when "Driver Source" is altered As stated by Sergey, it has something to do with "Depsgraph missing updates" **Exact steps for others to reproduce the error** Add a cycles material, create a driver in the node editor that takes input from any node variable within that material that uses the new dependency graph. [Nodebug_working.blend](https://archive.blender.org/developer/F2131742/Nodebug_working.blend) Attached example is attempting to control ScaleX using the variable input node, using the dependency graph.

MWire commented

2018-02-05 17:31:10 +01:00

Added subscriber: @MWire

Sergey Sharybin commented

2018-02-05 17:51:36 +01:00

Added subscriber: @Sergey

Sergey Sharybin commented

2018-02-05 17:51:36 +01:00

You have to run Blender with new dependency graph (--enable-new-depsgraph) command line argument. With new dependency graph the attached file works fine to me.

This is not possible to make this file to work in old dependency graph. In fact, we got rid of old dependency graph in blender2.8 branch already.

What i meant by "missing depsgraph updates" was more like "missing relations in dependency graph update". What that means in practice, is that due to more granular nature of new dependency graph, more edits in interface requires relations to be updated. Rarely, but this is still happening. In order to catch this class of errors you need to save file and re-load it. If that makes tihngs to work, this will indicate that some edit did not tell depsgraph that relations needs to be updated.

So, how do i make this file to fail with new dependency graph?

You have to run Blender with new dependency graph (`--enable-new-depsgraph`) command line argument. With new dependency graph the attached file works fine to me. This is not possible to make this file to work in old dependency graph. In fact, we got rid of old dependency graph in blender2.8 branch already. What i meant by "missing depsgraph updates" was more like "missing relations in dependency graph update". What that means in practice, is that due to more granular nature of new dependency graph, more edits in interface requires relations to be updated. Rarely, but this is still happening. In order to catch this class of errors you need to save file and re-load it. If that makes tihngs to work, this will indicate that some edit did not tell depsgraph that relations needs to be updated. So, how do i make this file to fail with new dependency graph?

MWire commented

2018-02-07 16:12:02 +01:00

Changed status from 'Open' to: 'Archived'

MWire closed this issue

2018-02-07 16:12:02 +01:00

MWire self-assigned this 2018-02-07 16:12:02 +01:00

MWire commented

2018-02-07 16:12:02 +01:00

I didn't know that, I assumed that it was already enabled by default.

Matheus Kirchesch commented

2020-12-12 14:59:36 +01:00

Added subscriber: @Kirchesch

Matheus Kirchesch commented

2020-12-12 14:59:36 +01:00

Is the new Despgraph default in Blender 2.9? because i have to update 3 time to update all my drivers

Sergey Sharybin commented

2021-01-08 16:18:58 +01:00

@Kirchesch, the, what used to be called, "new" depsgraph is the only one in Blender since 2.80. If you have some issues with drivers, please submit a new report, with all the details provided.

Matheus Kirchesch commented

2021-01-08 16:22:12 +01:00

In #54002#1089759, @Sergey wrote:
@Kirchesch, the, what used to be called, "new" depsgraph is the only one in Blender since 2.80. If you have some issues with drivers, please submit a new report, with all the details provided.

Yes, its a bug in Blender where you can't drive a value from a bone with another value from the same bone
I had to re-create the bone and the necessary hierarchy, and then copy the values from the re-created version

Thanks for the info anyway, i will submit it, even though its probably a known issue

> In #54002#1089759, @Sergey wrote: > @Kirchesch, the, what used to be called, "new" depsgraph is the only one in Blender since 2.80. If you have some issues with drivers, please submit a new report, with all the details provided. Yes, its a bug in Blender where you can't drive a value from a bone with another value from the same bone I had to re-create the bone and the necessary hierarchy, and then copy the values from the re-created version Thanks for the info anyway, i will submit it, even though its probably a known issue

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Depsgraph does not update #54002