Shape Key editing not working as expected. #81644

New Issue

Luke Costello · 2020-10-12T09:03:29+02:00

Luke Costello commented

2020-10-12 09:03:29 +02:00

System Information
Operating system: Windows-10-10.0.17134-SP0 64 Bits
Graphics card: GeForce GTX 750 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 432.00

Blender Version
Broken: version: 2.90.0, branch: master, commit date: 2020-08-31 11:26, hash: 0330d1af29
Worked: (newest version of Blender that worked as expected)

Short description of error
Experiencing a bug where editing the vertices of a dependent shape key changes the vertices of the basis shape key.

Exact steps for others to reproduce the error
go into edit mode of outerwall with key 1 selected, move a vertex. Then select the basis shape key and observe that it is behaving as though it is dependent. This isn't because the key 1 is actually the basis because if you move a vertex in the basis it also effects key 1 as you'd expect.

badshapekeys.blend

on an unrelated note, I have Mesh: LoopTools enabled and none of the functions are searchable.

**System Information** Operating system: Windows-10-10.0.17134-SP0 64 Bits Graphics card: GeForce GTX 750 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 432.00 **Blender Version** Broken: version: 2.90.0, branch: master, commit date: 2020-08-31 11:26, hash: `0330d1af29` Worked: (newest version of Blender that worked as expected) **Short description of error** Experiencing a bug where editing the vertices of a dependent shape key changes the vertices of the basis shape key. **Exact steps for others to reproduce the error** go into edit mode of outerwall with key 1 selected, move a vertex. Then select the basis shape key and observe that it is behaving as though it is dependent. This isn't because the key 1 is actually the basis because if you move a vertex in the basis it also effects key 1 as you'd expect. [badshapekeys.blend](https://archive.blender.org/developer/F8981594/badshapekeys.blend) on an unrelated note, I have Mesh: LoopTools enabled and none of the functions are searchable.

Luke Costello commented

2020-10-12 09:03:29 +02:00

Added subscriber: @lukostello

Luke Costello commented

2020-10-12 09:39:19 +02:00

I found out how I created this effect.

Make a mesh, create a basis key, Key1, and Key 2 shape keys. Delete the basis shape key. Move Key 2 up 1, then make Key 1 relative to Key 2.

I do this maneuver a lot because a lot of the time I want to change the basis shape key but not any of the dependent shape keys so I make a copy of the basis, do the changes, then delete the old one and make all the other shape keys relative to the new one. So its important that this work as expected.

I found out how I created this effect. Make a mesh, create a basis key, Key1, and Key 2 shape keys. Delete the basis shape key. Move Key 2 up 1, then make Key 1 relative to Key 2. I do this maneuver a lot because a lot of the time I want to change the basis shape key but not any of the dependent shape keys so I make a copy of the basis, do the changes, then delete the old one and make all the other shape keys relative to the new one. So its important that this work as expected.

Luke Costello commented

2020-10-12 09:54:27 +02:00

I can get around it for now by turning up Shape Key 1 to 1.0 doing new shape from mix then using that copy where I would have otherwise used Shape Key 1. Even though they are both relative to Key 2. What I suspect is happening is that when you delete the basis shape key Key 1 becomes the new basis shape for key 2 and this stays true after you move key 2 upward and switch the basis of Key 1 to Key 2. Which is why its solved by making a copy of Key 1 because Key 2's basis is Key 1 and not the copy of Key 1.

Seems the solution is when a key is moved to the top remove any shape keys it was set to be relative to, or just ignore the one that had been set.

I can get around it for now by turning up Shape Key 1 to 1.0 doing new shape from mix then using that copy where I would have otherwise used Shape Key 1. Even though they are both relative to Key 2. What I suspect is happening is that when you delete the basis shape key Key 1 becomes the new basis shape for key 2 and this stays true after you move key 2 upward and switch the basis of Key 1 to Key 2. Which is why its solved by making a copy of Key 1 because Key 2's basis is Key 1 and not the copy of Key 1. Seems the solution is when a key is moved to the top remove any shape keys it was set to be relative to, or just ignore the one that had been set.

Germano Cavalcante commented

2020-10-13 19:27:48 +02:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2020-10-13 19:27:48 +02:00

Thanks for the report.
It is actually a duplicate of the #79892 (After swapping the basis shape key to another one, the former basis key still affects the new one).
So I'll merge them.

Thanks for the report. It is actually a duplicate of the #79892 (After swapping the basis shape key to another one, the former basis key still affects the new one). So I'll merge them.

Germano Cavalcante commented

2020-10-13 19:28:05 +02:00

Closed as duplicate of #79892

Germano Cavalcante closed this issue

2020-10-13 19:28:05 +02:00

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Shape Key editing not working as expected. #81644