Change Details

**System Information** Operating system: Linux (and others) Graphics card: nVidia 1060 **Blender Version** Broken: 2.9x **Short description of error** In Weight Paint mode: If I lock some vertex groups and then Weights -> Smooth (or any operation that has adjustable values), things behave as expected. BUT, if I then try to alter the values the Properties popup window, the list of locked vertex groups changes (revert/undo?), which causes weights to bleed undesirably & defeating the purpose of locking groups. This can even return a "//All groups are locked//" error, if the previous configuration had 1 or less groups unlocked and Weights -> Normalize All is performed. Normalize All needs at least 2 groups unlocked to shift weights around, and if you try to alter the properties popup it will revert the locked weights list to an incompatible configuration. I've verified this bug with the Smooth, Levels and Normalize All procedures. Therefore, I'm assuming this will affect any Weights operation that has an adjustable properties popup. **Exact steps for others to reproduce the error** 1. Create cylinder (subdivisions not needed, but helps if you wan to understand the technique being used). 2. Skin cylinder to chain of at least 3 bones that resides within the cylinder. 3. Enter Weight Painting mode. 4. Lock all but 2 of the vertex groups, and select one of the unlocked groups. 5. Activate Weights -> Smooth 6. Adjust some values on the Factor or Iterations on the Properties popup. 7. Notice how the list of locked groups changes. {F9532295} **Assumed Issue** Perhaps Blender is altering these Properties values via Undos? If, in between steps 4 and 5, you perform another action (i.e. enter and exit Edit mode) it will not change the list of locked Vertex Groups. **Importance** This weight locking technique is very effective in preventing skin weights from bleeding across the model when skinning, which creates a mess that require cleanup (*see timestamp 9:30 Demeter's tutorial on "[[ https://cloud.blender.org/training/weight-painting/5efe0d7405aef1cf3b89644d#comment-4576 | Weight Painting Part 2 ]]". Demeter demonstrates the problem and his workaround, which can introduces other problems, as the "Clean" operation is destructive and does not always fully fix the bleeding weights. In the comments of the tutorial, I demonstrate the precision gained when using locked group weights and how it prevents bleeding, removing the need for any post cleanup. This bug prevents the awesome property sliders from being used, meaning that values have to be set very low and the weighting operation needs to be performed in multiple steps till the desired effect is reached. This is not a very effective workaround.

**System Information** Operating system: Linux (and others) Graphics card: nVidia 1060 **Blender Version** Broken: 2.9x **Short description of error** In Weight Paint mode: If I lock some vertex groups and then Weights -> Smooth (or any operation that has adjustable values), things behave as expected. BUT, if I then try to alter the values the Properties popup window, the list of locked vertex groups changes (revert/undo?), which causes weights to bleed undesirably & defeating the purpose of locking groups. This can even return a "//All groups are locked//" error, if the previous configuration had 1 or less groups unlocked and Weights -> Normalize All is performed. Normalize All needs at least 2 groups unlocked to shift weights around, and if you try to alter the properties popup it will revert the locked weights list to an incompatible configuration. I've verified this bug with the Smooth, Levels and Normalize All procedures. Therefore, I'm assuming this will affect any Weights operation that has an adjustable properties popup. **Exact steps for others to reproduce the error** 1. Create cylinder (subdivisions not needed, but helps if you wan to understand the technique being used). 2. Skin cylinder to chain of at least 3 bones that resides within the cylinder. 3. Enter Weight Painting mode. 4. Lock all but 2 of the vertex groups, and select one of the unlocked groups. 5. Activate Weights -> Smooth 6. Adjust some values on the Factor or Iterations on the Properties popup. 7. Notice how the list of locked groups changes. {F9532295} **Assumed Issue** Perhaps Blender is altering these Properties values via Undos? If, in between steps 4 and 5, you perform another action (i.e. enter and exit Edit mode) it will not change the list of locked Vertex Groups. **Importance** This weight locking technique is very effective in preventing skin weights from bleeding across the model when skinning, which creates a mess that require cleanup (*see timestamp 9:30 Demeter's tutorial on "[[ https://cloud.blender.org/training/weight-painting/5efe0d7405aef1cf3b89644d#comment-4576 | Weight Painting Part 2 ]]". Demeter demonstrates the problem and his workaround, which can introduces other problems, as the "Clean" operation is destructive and does not always fully fix the bleeding weights. In the comments of the tutorial, I demonstrate the precision gained when using locked group weights and how it prevents bleeding, removing the need for any post cleanup. This bug prevents the awesome property sliders from being used, meaning that values have to be set very low and the weighting operation needs to be performed in multiple steps till the desired effect is reached. This is not a very effective workaround. **BONUS** While looking at the code involved in this bug, I request looking at adding in a "Normalize" checkbox to allow the affects of the operations to be seen immediately on the vertex positions, without the requirement of additional Normalize steps. When performing operations such as Smooth, it's very common (assumed) that this step will be followed up with a Normalize All operation. Many popular skin weighting addons (see below) try to fill this gap by introducing checkboxes to automatically perform Normalize operations after adjusting weights. Here are two Example Addons that introduce an "auto normalize" for common Weight operations. https://gumroad.com/l/weight_paint_tools https://gumroad.com/l/smooth_unlocked

**System Information** Operating system: Linux (and others) Graphics card: nVidia 1060 **Blender Version** Broken: 2.9x **Short description of error** In Weight Paint mode: If I lock some vertex groups and then Weights -> Smooth (or any operation that has adjustable values), things behave as expected. BUT, if I then try to alter the values the Properties popup window, the list of locked vertex groups changes (revert/undo?), which causes weights to bleed undesirably & defeating the purpose of locking groups. This can even return a "//All groups are locked//" error, if the previous configuration had 1 or less groups unlocked and Weights -> Normalize All is performed. Normalize All needs at least 2 groups unlocked to shift weights around, and if you try to alter the properties popup it will revert the locked weights list to an incompatible configuration. I've verified this bug with the Smooth, Levels and Normalize All procedures. Therefore, I'm assuming this will affect any Weights operation that has an adjustable properties popup. **Exact steps for others to reproduce the error** 1. Create cylinder (subdivisions not needed, but helps if you wan to understand the technique being used). 2. Skin cylinder to chain of at least 3 bones that resides within the cylinder. 3. Enter Weight Painting mode. 4. Lock all but 2 of the vertex groups, and select one of the unlocked groups. 5. Activate Weights -> Smooth 6. Adjust some values on the Factor or Iterations on the Properties popup. 7. Notice how the list of locked groups changes. {F9532295} **Assumed Issue** Perhaps Blender is altering these Properties values via Undos? If, in between steps 4 and 5, you perform another action (i.e. enter and exit Edit mode) it will not change the list of locked Vertex Groups. **Importance** This weight locking technique is very effective in preventing skin weights from bleeding across the model when skinning, which creates a mess that require cleanup (*see timestamp 9:30 Demeter's tutorial on "[[ https://cloud.blender.org/training/weight-painting/5efe0d7405aef1cf3b89644d#comment-4576 | Weight Painting Part 2 ]]". Demeter demonstrates the problem and his workaround, which can introduces other problems, as the "Clean" operation is destructive and does not always fully fix the bleeding weights. In the comments of the tutorial, I demonstrate the precision gained when using locked group weights and how it prevents bleeding, removing the need for any post cleanup. This bug prevents the awesome property sliders from being used, meaning that values have to be set very low and the weighting operation needs to be performed in multiple steps till the desired effect is reached. This is not a very effective workaround. **BONUS** While looking at the code involved in this bug, I request looking at adding in a "Normalize" checkbox to allow the affects of the operations to be seen immediately on the vertex positions, without the requirement of additional Normalize steps. When performing operations such as Smooth, it's very common (assumed) that this step will be followed up with a Normalize All operation. Many popular skin weighting addons (see below) try to fill this gap by introducing checkboxes to automatically perform Normalize operations after adjusting weights. Here are two Example Addons that introduce an "auto normalize" for common Weight operations. https://gumroad.com/l/weight_paint_tools https://gumroad.com/l/smooth_unlocked