Blender 3.0 drivers in constraint gone missing. But the driver but still works #94063

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Ravi Prathama · 2021-12-14T14:05:14+01:00

Ravi Prathama commented

2021-12-14 14:05:14 +01:00

Operating system: Windows 10
Graphics card: Nvidia Quadro K2100M (But I mostly use CPU)

Broken: 3.0, f1cca30557, master, 2021-12-02 18:35 (It also happened in 3.1, b647509913, 2021-12-13 23:43)
Worked: 2.93, 8b80d19f36, master, 2021-08-17 18:30

So I have a rig that I made in 2.93 that I recently just updated to 3.0. And in that rig, I have a driver that toggles a constraint on or off. At first, everything went fine until I realized that the driver had gone missing. And the weird thing is that everything seems to work fine as if the drivers were there. And when I tried to open the rig file in 2.93, the driver is there.

Let's take the Eye bone. This is how the constraint should look like in 2.93.

And here's how it looks like in 3.0.

As you can see, the driver on the Transform constraint somehow disappears. But the weird thing is that that driver still works like normal.
Also, when I open the driver in the Driver Editor. The driver is available and could be edited.

Here's another example.

I tried opening an older version of the rig in 3.0 and the problem is still there. It only disappears when I open the rig in 2.93.
Also, not every driver went missing. There is a driver that is still visible, but this is because I just recently added it in 3.0. And this bug seems to only affect the constraints since the modifiers aren't affected.

Here's my rig file:
SS EndEdit R4 Exp v13.6 (New 2D Face Controls).blend
Make sure that you enable the UI script in the scripting tab.

Operating system: Windows 10 Graphics card: Nvidia Quadro K2100M (But I mostly use CPU) Broken: 3.0, f1cca3055776, master, 2021-12-02 18:35 (It also happened in 3.1, b64750991334, 2021-12-13 23:43) Worked: 2.93, 8b80d19f3641, master, 2021-08-17 18:30 So I have a rig that I made in 2.93 that I recently just updated to 3.0. And in that rig, I have a driver that toggles a constraint on or off. At first, everything went fine until I realized that the driver had gone missing. And the weird thing is that everything seems to work fine as if the drivers were there. And when I tried to open the rig file in 2.93, the driver is there. Let's take the Eye bone. This is how the constraint should look like in 2.93. ![blender_ZbT3IgnGiC.png](https://archive.blender.org/developer/F12739344/blender_ZbT3IgnGiC.png) And here's how it looks like in 3.0. ![blender_4FFrSqQB77.png](https://archive.blender.org/developer/F12739346/blender_4FFrSqQB77.png) As you can see, the driver on the Transform constraint somehow disappears. But the weird thing is that that driver still works like normal. Also, when I open the driver in the Driver Editor. The driver is available and could be edited. ![blender_KU9rtAMLiS.png](https://archive.blender.org/developer/F12739481/blender_KU9rtAMLiS.png) Here's another example. ![blender_HFUO34Lpee.png](https://archive.blender.org/developer/F12739441/blender_HFUO34Lpee.png) I tried opening an older version of the rig in 3.0 and the problem is still there. It only disappears when I open the rig in 2.93. Also, not every driver went missing. There is a driver that is still visible, but this is because I just recently added it in 3.0. And this bug seems to only affect the constraints since the modifiers aren't affected. Here's my rig file: [SS EndEdit R4 Exp v13.6 (New 2D Face Controls).blend](https://archive.blender.org/developer/F12739360/SS_EndEdit_R4_Exp_v13.6__New_2D_Face_Controls_.blend) Make sure that you enable the UI script in the scripting tab.

Ravi Prathama commented

2021-12-14 14:05:14 +01:00

Added subscriber: @Endertainer007-3

Ravi Prathama changed title from ~~Blender 3.0 some drviers gone missing but still works~~ to Blender 3.0 drviers in constraint gone missing. But the driver but still works

2021-12-14 15:17:27 +01:00

Ravi Prathama commented

2021-12-14 16:49:30 +01:00

So I just experimented to replicate this bug.

In this experiment, I have a cube with a wireframe modifier and a Transform constraint. This cube also has two custom properties that act as a switch for the modifier & constraint. In Blender 2.93, both custom properties switch the modifier & constraint like normal. And the driver in both modifier & constraint can be right-clicked and edited. But when the same file was opened in 3.0, the driven in the Transform constraint somehow disappear. And the weird thing is that the constraint acts like the driver is still there, it even appears in the Driver Editor, but not in the constraint itself.

Here's a video on the experiment
3.0 Constraint Driver Bug Test.mp4

And here's the Test file
3.0 Driver Bug Test.blend

So I just experimented to replicate this bug. In this experiment, I have a cube with a wireframe modifier and a Transform constraint. This cube also has two custom properties that act as a switch for the modifier & constraint. In Blender 2.93, both custom properties switch the modifier & constraint like normal. And the driver in both modifier & constraint can be right-clicked and edited. But when the same file was opened in 3.0, the driven in the Transform constraint somehow disappear. And the weird thing is that the constraint acts like the driver is still there, it even appears in the Driver Editor, but not in the constraint itself. Here's a video on the experiment [3.0 Constraint Driver Bug Test.mp4](https://archive.blender.org/developer/F12739810/3.0_Constraint_Driver_Bug_Test.mp4) And here's the Test file [3.0 Driver Bug Test.blend](https://archive.blender.org/developer/F12739836/3.0_Driver_Bug_Test.blend)

Ravi Prathama changed title from ~~Blender 3.0 drviers in constraint gone missing. But the driver but still works~~ to Blender 3.0 drivers in constraint gone missing. But the driver but still works

2021-12-14 17:03:42 +01:00

Ravi Prathama commented

2021-12-15 02:24:22 +01:00

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

Ravi Prathama commented

2021-12-15 13:25:21 +01:00

Removed subscriber: @Endertainer007-3

Ravi Prathama commented

2021-12-15 13:25:27 +01:00

Added subscriber: @Endertainer007-3

Trung Phạm commented

2021-12-31 13:28:18 +01:00

Added subscriber: @zNight

Georg K commented

2022-01-21 03:13:12 +01:00

Added subscriber: @georgK

Georg K commented

2022-01-21 03:13:12 +01:00

This seems to be a duplicate of https://developer.blender.org/T93987

This regression not only applies to drivers but also keyframes:

System Information
Operating system: Linux-5.15.12-1-MANJARO-x86_64-with-glibc2.33 64 Bits
Graphics card: AMD VERDE (DRM 2.50.0, 5.15.12-1-MANJARO, LLVM 13.0.0) AMD 4.5 (Core Profile) Mesa 21.3.2

Blender Version
Broken: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: f1cca30557, version: 3.1.0 Alpha, branch: master, commit date: 2022-01-20 11:55, hash: 969a571e0f
Worked: 2.93

Short description of error
Opening a 2.93 file in 3.0 or later:
Although the animation still works, the eye icon for the Enabled/Disabled property of constraints looses it's yellow/green/orange coloring. So you don't see that the property is animated.
Also, Delete/Clear keyframes is missing from the context menu, using insert keyframe creates a new f-curve instead of inserting the keyframes in the existing f-curve.
The reason for this issue might be that the corresponding f-curve was called "Disable ..." in 2.93, but "Enabled ..." in 3.0.

Exact steps for others to reproduce the error
In the default scene of blender 2.93,
select the camera, add a Track To constraint,
hover the cursor over the eye icon, press I
save and open in Blender 3.0 or 3.1
the yellow highlight is not shown

This seems to be a duplicate of https://developer.blender.org/T93987 This regression not only applies to drivers but also keyframes: **System Information** Operating system: Linux-5.15.12-1-MANJARO-x86_64-with-glibc2.33 64 Bits Graphics card: AMD VERDE (DRM 2.50.0, 5.15.12-1-MANJARO, LLVM 13.0.0) AMD 4.5 (Core Profile) Mesa 21.3.2 **Blender Version** Broken: 3.0.0, branch: master, commit date: 2021-12-02 18:35, hash: `f1cca30557`, version: 3.1.0 Alpha, branch: master, commit date: 2022-01-20 11:55, hash: `969a571e0f` Worked: 2.93 **Short description of error** Opening a 2.93 file in 3.0 or later: Although the animation still works, the eye icon for the Enabled/Disabled property of constraints looses it's yellow/green/orange coloring. So you don't see that the property is animated. Also, Delete/Clear keyframes is missing from the context menu, using insert keyframe creates a new f-curve instead of inserting the keyframes in the existing f-curve. The reason for this issue might be that the corresponding f-curve was called "Disable ..." in 2.93, but "Enabled ..." in 3.0. **Exact steps for others to reproduce the error** In the default scene of blender 2.93, select the camera, add a Track To constraint, hover the cursor over the eye icon, press I save and open in Blender 3.0 or 3.1 the yellow highlight is not shown

Philipp Oeser commented

2022-03-29 11:19:41 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2022-03-29 11:19:41 +02:00

In #94063#1292232, @georgK wrote:
This seems to be a duplicate of https://developer.blender.org/T93987

Agree, will merge these reports

> In #94063#1292232, @georgK wrote: > This seems to be a duplicate of https://developer.blender.org/T93987 Agree, will merge these reports

Philipp Oeser commented

2022-03-29 11:20:19 +02:00

Closed as duplicate of #93987

Philipp Oeser closed this issue

2022-03-29 11:20:19 +02:00

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Blender 3.0 drivers in constraint gone missing. But the driver but still works #94063