NLA bake does not bake shape keys values #101149

New Issue

Andrej · 2022-09-17T16:03:45+02:00

Andrej commented

2022-09-17 16:03:45 +02:00

Tested on Blender 3.2, 3.3

Short description

I have a shape key animation that's driven by some other property (for example, object location).
If I try to bake it in NLA (F3 - nla.bake and run bake will options checked) it does bake object location, rotation etc but it ignores shape keys values.

It is important to be able to bake shape keys values to keyframes too because:

after bake it will be possible to edit shape keys data as curves
sometimes baking is required to be able to export shape keys values in some other software

My suggestion will be to either to bake shape keys values all the time or to add an option to do so.
Other thing is there is no option to bake custom properties too.

I've found some people that met this issue before - [here ]] and [ https:*www.reddit.com/r/blenderhelp/comments/rhgwck/comment/hoqino2/ | there, usually people add multiple bones to drive shape keys and then work with those bones animation.
Which seems redundant if you have really many shape keys (for example in productions for face animation we use around more than 50 of them).

Exact steps to reproduce the error
I've attached blend file with example - it's just a cube that has 1 shape key that's attached to cube's X location with driver. cube_shapekey_bake.blend
You can try to bake it with nla.bake and then check in Dope Sheet that no shape keys values keyframes was added.

I've also wrote a script that does exactly that.
I've attached the script to the blend file - you can go to scripting and run it to get the bake shape keys values for currently selected object.
It might be helpful for someone who struggles with that issue until it solved.

import bpy

context = bpy.context
scene = context.scene
object = context.object
frame_start = scene.frame_start
frame_end = scene.frame_end

# bake current shapekeys values to keyframes (no need to actually store them)
for frame in range(frame_start, frame_end+1):

scene.frame_set(frame)
for sk in object.data.shape_keys.key_blocks:
if sk.name == 'Basis':
continue
sk.keyframe_insert("value", frame=frame)


# remove baked drivers from shapekeys
drivers = object.data.shape_keys.animation_data.drivers
drivers_to_remove = list()
for fcurve in object.data.shape_keys.animation_data.drivers.values():

data_path = fcurve.data_path
sk_name = data_path.split('key_blocks["')[1].rsplit('"].value')[0]
drivers_to_remove.append(fcurve)


for driver in drivers_to_remove:

print(f'removing driver {driver}')
drivers.remove(driver)

Tested on Blender 3.2, 3.3 **Short description** I have a shape key animation that's driven by some other property (for example, object location). If I try to bake it in NLA (F3 - nla.bake and run bake will options checked) it does bake object location, rotation etc but it ignores shape keys values. It is important to be able to bake shape keys values to keyframes too because: 1) after bake it will be possible to edit shape keys data as curves 2) sometimes baking is required to be able to export shape keys values in some other software My suggestion will be to either to bake shape keys values all the time or to add an option to do so. Other thing is there is no option to bake custom properties too. I've found some people that met this issue before - [here ]] and [[ https:*www.reddit.com/r/blenderhelp/comments/rhgwck/comment/hoqino2/ | there](https:*blenderartists.org/t/bake-action-and-shape-key-action/1310333), usually people add multiple bones to drive shape keys and then work with those bones animation. Which seems redundant if you have really many shape keys (for example in productions for face animation we use around more than 50 of them). **Exact steps to reproduce the error** I've attached blend file with example - it's just a cube that has 1 shape key that's attached to cube's X location with driver. [cube_shapekey_bake.blend](https://archive.blender.org/developer/F13504130/cube_shapekey_bake.blend) You can try to bake it with nla.bake and then check in Dope Sheet that no shape keys values keyframes was added. I've also wrote a script that does exactly that. I've attached the script to the blend file - you can go to scripting and run it to get the bake shape keys values for currently selected object. It might be helpful for someone who struggles with that issue until it solved. ```python import bpy context = bpy.context scene = context.scene object = context.object frame_start = scene.frame_start frame_end = scene.frame_end # bake current shapekeys values to keyframes (no need to actually store them) for frame in range(frame_start, frame_end+1): ``` scene.frame_set(frame) for sk in object.data.shape_keys.key_blocks: if sk.name == 'Basis': continue sk.keyframe_insert("value", frame=frame) ``` # remove baked drivers from shapekeys drivers = object.data.shape_keys.animation_data.drivers drivers_to_remove = list() for fcurve in object.data.shape_keys.animation_data.drivers.values(): ``` data_path = fcurve.data_path sk_name = data_path.split('key_blocks["')[1].rsplit('"].value')[0] drivers_to_remove.append(fcurve) ``` for driver in drivers_to_remove: ``` print(f'removing driver {driver}') drivers.remove(driver) ``` ```

Andrej commented

2022-09-17 16:03:45 +02:00

Added subscriber: @Andrej-4

Omar Emara commented

2022-09-26 10:13:18 +02:00

Added subscriber: @OmarEmaraDev

Omar Emara commented

2022-09-26 10:13:18 +02:00

This seems to be the same general issue in #65773 and #96459, which is considered a to-do because the bake operator is specifically made for transformation data.
But it seems there is work toward supporting other properties like shape keys and custom properties, so you can track that in the linked task, which I will merge to.

This seems to be the same general issue in #65773 and #96459, which is considered a to-do because the bake operator is specifically made for transformation data. But it seems there is work toward supporting other properties like shape keys and custom properties, so you can track that in the linked task, which I will merge to.

Omar Emara commented

2022-09-26 10:13:34 +02:00

Closed as duplicate of #65773

Omar Emara closed this issue

2022-09-26 10:13:34 +02:00

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NLA bake does not bake shape keys values #101149