Fails to export shape key in GlTF with apply modifiers #69622

New Issue

Ethan Chandler · 2019-09-07T19:47:03+02:00

Ethan Chandler commented

2019-09-07 19:47:03 +02:00

System Information
Operating system: Windows 10 Home
Graphics card: "Intel HD Graphics 630 and "NVIDIA GeForce GTX 1060"

Blender Version
Broken: v2.81 Alpha Date 2019-09-07 16:22 Hash-abeab4fcad66
Worked: N/A

Short description of error

When exporting with the glTF 2 exporter and select "Apply Modifiers" as well as "Shape Keys", the shape keys are applied and not exported.

Why this is a bug

Shape keys should not be applied if the user has selected "Shape keys" to export, they should be exported even if "Apply Modifiers" was selected. This is because if the user has selected "Shape Keys" under export then they specifically want their shape keys exported.

Exact steps for others to reproduce the error

1. Open the SuzanneShapeKey.blend file attached.  (It was created by following the first 2 minutes and 6 seconds of this tutorial  https://www.youtube.com/watch?v=e675Ulc7QL4)
2. Select "File/Export/GLTF 2.0"
3. Select "Apply Modifiers" under the general tab
4. Select format "GLTF Binary" under the general tab  (It should be the same for other formats)
5. Select "Shape Keys" under the animation tab
6. Click "Export GLTF 2.0"

The shape keys were not exported. You can verify this in an external tool such as the Godot engine but also by following these steps in Blender:

1. File/New/General
2. File/Import/GLTF and then select the GLTF file you had previously exported
3. Select Suzan under collections
4. Select the Context. Object Data Tab
5. You can see there are no shape keys

SuzanneShapeKey.blend

(ps. I did not mention any other bug reports in above text, I'm not sure why it's saying that I did)

**System Information** Operating system: Windows 10 Home Graphics card: "Intel HD Graphics 630 and "NVIDIA GeForce GTX 1060" **Blender Version** Broken: v2.81 Alpha Date 2019-09-07 16:22 Hash-abeab4fcad66 Worked: N/A **Short description of error** When exporting with the glTF 2 exporter and select "*Apply Modifiers*" as well as "*Shape Keys*", the shape keys are applied and not exported. **Why this is a bug** Shape keys should not be applied if the user has selected "*Shape keys*" to export, they should be exported even if "*Apply Modifiers*" was selected. This is because if the user has selected "*Shape Keys*" under export then they specifically want their *shape keys* exported. **Exact steps for others to reproduce the error** 1. Open the SuzanneShapeKey.blend file attached. (It was created by following the first 2 minutes and 6 seconds of this tutorial https://www.youtube.com/watch?v=e675Ulc7QL4) 2. Select "File/Export/GLTF 2.0" 3. Select "Apply Modifiers" under the general tab 4. Select format "GLTF Binary" under the general tab (It should be the same for other formats) 5. Select "Shape Keys" under the animation tab 6. Click "Export GLTF 2.0" # The shape keys were not exported. You can verify this in an external tool such as the Godot engine but also by following these steps in Blender: 1. File/New/General 2. File/Import/GLTF and then select the GLTF file you had previously exported 3. Select Suzan under collections 4. Select the Context. Object Data Tab 5. You can see there are no shape keys [SuzanneShapeKey.blend](https://archive.blender.org/developer/F7721966/SuzanneShapeKey.blend) (ps. I did not mention any other bug reports in above text, I'm not sure why it's saying that I did)

Ethan Chandler commented

2019-09-07 19:47:03 +02:00

Added subscriber: @Ortus

Julien Duroure self-assigned this 2019-09-07 23:15:02 +02:00

Julien Duroure commented

2019-09-07 23:44:18 +02:00

Hello,

Seems to be a limitation of Blender. Same way you can't apply a modifier when there are some shapekeys, you can't export it this way.
(Note: this is also the behaviour of fbx export).

Hello, Seems to be a limitation of Blender. Same way you can't apply a modifier when there are some shapekeys, you can't export it this way. (Note: this is also the behaviour of fbx export).

Ethan Chandler commented

2019-09-08 00:17:43 +02:00

Oh ok... I did some more research and found out that some people use scripts like these (below) to get around this limitation.

https://github.com/naelstrof/ApplyModifierForObjectWithShapeKeys
https://github.com/Menithal/ApplyModifierForObjectWithShapeKeys
https://github.com/iszotic/ApplyModifierForObjectWithShapeKeys

Maybe useful. I believe it creates separate objects for each shape key, applies the modifiers to each of them, then combines the them all as shape keys into one object. I don't know if something like that could be be added into the export code to fix this problem? or if it counts as a feature request and not a bug?

Sorry I'm still kind-of new to Blender and this is my first bug report.

Oh ok... I did some more research and found out that some people use scripts like these (below) to get around this limitation. https://github.com/naelstrof/ApplyModifierForObjectWithShapeKeys https://github.com/Menithal/ApplyModifierForObjectWithShapeKeys https://github.com/iszotic/ApplyModifierForObjectWithShapeKeys Maybe useful. I believe it creates separate objects for each shape key, applies the modifiers to each of them, then combines the them all as shape keys into one object. I don't know if something like that could be be added into the export code to fix this problem? or if it counts as a feature request and not a bug? Sorry I'm still kind-of new to Blender and this is my first bug report.

Julien Duroure commented

2019-09-09 09:35:17 +02:00

Changed status from 'Open' to: 'Archived'

Julien Duroure closed this issue

2019-09-09 09:35:17 +02:00

Julien Duroure commented

2019-09-09 09:35:17 +02:00

Hello,
Probably more a feature request than a bug, because this is the global behaviour of blender to work like that. Closing this, not really linked to glTF specifically.
This needs to be discussed with other developers if some workaround are possible or not.

Thanks !

Hello, Probably more a feature request than a bug, because this is the global behaviour of blender to work like that. Closing this, not really linked to glTF specifically. This needs to be discussed with other developers if some workaround are possible or not. Thanks !

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Fails to export shape key in GlTF with apply modifiers #69622

The shape keys were not exported. You can verify this in an external tool such as the Godot engine but also by following these steps in Blender: