Creating new geometry with blend shape causes only new points to be interpolated on all subsequent new keys. #48609

New Issue

Joseph Catrambone · 2016-06-08T06:12:21+02:00

Joseph Catrambone commented

2016-06-08 06:12:21 +02:00

System Information
Windows 10 Pro 64-bit (10.0 Build 10586)
DirectX Version: 12
Graphics Card: nVidia GTX 970
Graphics Driver: 10.18.13.6451
Processor: Intel Core i5-2500K
Ram: 24576MB Ram

Blender Version
Broken: 2.77a

Short description of error
If new geometry is created in a shape key, any new shape keys created after the fact will have some amount of the first key's deformation applied to them. New keys should be 'clean' and not deform, since there's no way to reset new shape keys to the default. It should also be noted that only the new geometry is interpolated on the new key, not the old geometry.

Exact steps for others to reproduce the error
Steps to Reproduce:

Begin with the default scene.
Create a cube.
Subdivide the cube twice.
Create a 'basis' shape key.
Create a 'key 1' shape key.
Adjust the 'key 1' value to 100%.
Switch to the sculpt tool and deform the cube.
Tab into edit mode and create a ring cut with Ctrl+R.
Tab back into object mode and move the 'key 1' value back to 0.
Create a new shape key, 'key 2'.

Expected Behavior: New shape key should match the basis key and should have no deformation applied to it.

Observed Behavior: New shape key, when dragged to 100%, applies the same interpolation as the newly created geometry from key 1. It is not currently possible to create a 'clean' key which can have additional deformation added to it.

Reproducibility: 100%

Blend file, video, and system info are attached.

system-info.txt

blender_shape_key_bug.blend

**System Information** Windows 10 Pro 64-bit (10.0 Build 10586) DirectX Version: 12 Graphics Card: nVidia GTX 970 Graphics Driver: 10.18.13.6451 Processor: Intel Core i5-2500K Ram: 24576MB Ram **Blender Version** Broken: 2.77a **Short description of error** If new geometry is created in a shape key, any new shape keys created after the fact will have some amount of the first key's deformation applied to them. New keys should be 'clean' and not deform, since there's no way to reset new shape keys to the default. It should also be noted that only the new geometry is interpolated on the new key, not the old geometry. **Exact steps for others to reproduce the error** Steps to Reproduce: 1) Begin with the default scene. 2) Create a cube. 3) Subdivide the cube twice. 4) Create a 'basis' shape key. 5) Create a 'key 1' shape key. 6) Adjust the 'key 1' value to 100%. 7) Switch to the sculpt tool and deform the cube. 8) Tab into edit mode and create a ring cut with Ctrl+R. 9) Tab back into object mode and move the 'key 1' value back to 0. 10) Create a new shape key, 'key 2'. Expected Behavior: New shape key should match the basis key and should have no deformation applied to it. Observed Behavior: New shape key, when dragged to 100%, applies the same interpolation as the newly created geometry from key 1. It is not currently possible to create a 'clean' key which can have additional deformation added to it. Reproducibility: 100% Blend file, video, and system info are attached. [system-info.txt](https://archive.blender.org/developer/F316396/system-info.txt) [blender_shape_key_bug.blend](https://archive.blender.org/developer/F316397/blender_shape_key_bug.blend) ![blender_shape_key_bug.gif](https://archive.blender.org/developer/F316398/blender_shape_key_bug.gif)

Joseph Catrambone commented

2016-06-08 06:12:21 +02:00

Changed status to: 'Open'

Joseph Catrambone commented

2016-06-08 06:12:21 +02:00

Added subscriber: @JosephCatrambone

Alex commented

2016-06-08 17:08:37 +02:00

Added subscriber: @SpectreFirst

Alex commented

2016-06-08 17:08:37 +02:00

I think I can get where your problem comes from: when you are making a loop cut, is your selected shape key is "Key 1"? It seems that if you create shape key "Key 1", select "Basis" and then make your loop cut, key 2 will not retain changes from "Key 1". Maybe I got something wrong, but I was able to replicate your problem when I was making a loop cut while "Key 1" was selected.

Joseph Catrambone commented

2016-06-08 19:05:11 +02:00

That's correct, Alex. I see having "Basis" selected when adding geometry alleviates the issue (in my small-scale test) and provides a workaround for me, so I'm unblocked. Is this expected behavior?

Campbell Barton self-assigned this 2016-06-13 11:48:34 +02:00

Campbell Barton commented

2016-06-17 17:28:19 +02:00

Closed as duplicate of #44415

Campbell Barton closed this issue

2016-06-17 17:28:19 +02:00

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Creating new geometry with blend shape causes only new points to be interpolated on all subsequent new keys. #48609