Drivers are lost upon converting a collection instance to a local set of objects #70551

New Issue

Russell · 2019-10-05T06:44:08+02:00

Russell commented

2019-10-05 06:44:08 +02:00

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.48

Blender Version
Broken: version: 2.81 (sub 13), branch: master, commit date: 2019-10-03 14:29, hash: 8c991bf63a
Worked: (optional)

Short description of error
Driving an object setting from its own custom property can be easy with a driver expression, for example setting a rotation control to: radians(self["prop"]*360)

Duplicating the object will produce a copy that also has the same internal driver expression independent of the original. However, if you instead put the object in a collection and then add an instance of the collection you have no access to any custom properties, which is its own bug that I'll report separately. So you go to Object->Apply->Make Instances Real to convert the collection instance to a local copy. This step removes the drivers.

Exact steps for others to reproduce the error

Add a custom property to the default cube. Leave it as the default 'prop' property.
Add a driver to the x rotation transform using the expression: radians(self["prop"]*360)
Be sure to check the 'use self' checkbox below the python expression box.
Put the cube object inside a collection.
Add an instance of that new collection to the scene.
Notice that there's no access to any custom properties now that the cube is in a collection instance, which is also a bug.
Object->Apply->Make Instances Real, which converts the collection instance to its base objects
The driver is gone.

**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: GeForce RTX 2080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.48 **Blender Version** Broken: version: 2.81 (sub 13), branch: master, commit date: 2019-10-03 14:29, hash: `8c991bf63a` Worked: (optional) **Short description of error** Driving an object setting from its own custom property can be easy with a driver expression, for example setting a rotation control to: radians(self["prop"]*360) Duplicating the object will produce a copy that also has the same internal driver expression independent of the original. However, if you instead put the object in a collection and then add an instance of the collection you have no access to any custom properties, which is its own bug that I'll report separately. So you go to Object->Apply->Make Instances Real to convert the collection instance to a local copy. This step removes the drivers. **Exact steps for others to reproduce the error** 1. Add a custom property to the default cube. Leave it as the default 'prop' property. 2. Add a driver to the x rotation transform using the expression: radians(self["prop"]*360) 3. Be sure to check the 'use self' checkbox below the python expression box. 4. Put the cube object inside a collection. 5. Add an instance of that new collection to the scene. 6. Notice that there's no access to any custom properties now that the cube is in a collection instance, which is also a bug. 7. Object->Apply->Make Instances Real, which converts the collection instance to its base objects 8. The driver is gone.

Russell commented

2019-10-05 06:44:09 +02:00

Added subscriber: @Russ1642

Dalai Felinto commented

2019-10-10 23:32:06 +02:00

Added subscribers: @dr.sybren, @dfelinto

Dalai Felinto commented

2019-10-10 23:32:06 +02:00

Hi, thanksfor the report.
Note: This was happening already with groups in 2.79:

groups.blend

(open the file and convert the right-most cube to real)

I believe this may be by design-ish. The conversion from instance to real in a way bakes the current transformations into the new object.
@dr.sybren is this something the animation module is interesting on looking at? If not feel free to close the report

Notice that there's no access to any custom properties now that the cube is in a collection instance, which is also a bug.

Please report different bugs separately. And as far as I can tell this is not a bug.

Hi, thanksfor the report. Note: This was happening already with groups in 2.79: [groups.blend](https://archive.blender.org/developer/F7803357/groups.blend) (open the file and convert the right-most cube to real) I believe this may be by design-ish. The conversion from instance to real in a way bakes the current transformations into the new object. @dr.sybren is this something the animation module is interesting on looking at? If not feel free to close the report > 6. Notice that there's no access to any custom properties now that the cube is in a collection instance, which is also a bug. Please report different bugs separately. And as far as I can tell this is not a bug.

Bastien Montagne was assigned by Sybren A. Stüvel

2019-10-30 10:05:38 +01:00

Bastien Montagne removed their assignment 2019-11-08 11:37:17 +01:00

Bastien Montagne commented

2019-11-08 11:37:17 +01:00

Added subscriber: @mont29

Bastien Montagne commented

2019-11-08 11:37:17 +01:00

This is indeed working as expected in the code (see call to BKE_animdata_free() in make_object_duplilist_real(), so not a bug. Whether we want a different behavior here is design task, which I'll let to the anim team for handling.

This is indeed working as expected in the code (see call to `BKE_animdata_free()` in `make_object_duplilist_real()`, so not a bug. Whether we want a different behavior here is design task, which I'll let to the anim team for handling.

Sybren A. Stüvel commented

2019-12-06 16:24:47 +01:00

Changed status from 'Open' to: 'Archived'

Sybren A. Stüvel closed this issue

2019-12-06 16:24:47 +01:00

Sybren A. Stüvel self-assigned this 2019-12-06 16:24:47 +01:00

Sybren A. Stüvel commented

2019-12-06 16:24:47 +01:00

The same happens (also in make_object_duplilist_real()) for constraints, they also disappear.

I'm inclined to close this issue, as designing new behaviour will take quite some work and isn't planned now. It's not a trivial thing to solve.

The same happens (also in `make_object_duplilist_real()`) for constraints, they also disappear. I'm inclined to close this issue, as designing new behaviour will take quite some work and isn't planned now. It's not a trivial thing to solve.

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Drivers are lost upon converting a collection instance to a local set of objects #70551