Lazy Weight Tool

Adding the Smooth weight button might be useful ? or is that built into the Select more and Less?

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In ver1.1, added the “Smooth” button :smile:


Nice thanks :stuck_out_tongue:

ver1.2.1 Compatible with Blender2.79

Compatible with Blender 2.79

The menu is in the “Tools” tab of the tool shelf (T key).

Bug fixes

  • Fixed an issue where pie menu weight setting .9 and 1 could not be accessed.
  • Changed the pie menu layout
  • Fixed an issue where more/less selection would not work if the edit mode was not in vertex selection mode
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This small addon really helps me rigging faster! If possible, I’d like to propose some suggestions:

  1. As it currently is, Lazy Weight Tool’s pie menu appears when the mesh object is the only object selected. Please make it still accessible when an armature is also selected, how I think most people do weight painting.
  2. An option to automatically mirror / symmetrize the weight assigned will be helpful, too. For now, I have to paint over manually-assigned vertices with Add 0.0 brush to force value mirroring.
  3. In complex rigs, vertex groups aren’t only used for deform bones, but also to limit mask, lattice, hooks, dynamic paints, etc. An option to limit normalization only to deform bones will help users save time from reassigning values to non-armature vertex groups. For now, I have to constantly remind myself not to assign weight manually through Lazy Weight Tool in areas containing these extra vertex groups, to avoid extra reassignment works.
  4. Options to add / subtract weight by small increments like 0.05 / 0.1 will help, too. Most rigging job I took can’t rely on smoothing values alone, and always involve minute precise tweaks like these, so I have to constantly tweak weight slider and change brush. I imagine additions of Add Weight operators to the right pie menu area, and Subtract ones to the left, will simplify this job tremendously.

Anyway, this addon is very promising and I hope you keep developing it. Thank you!

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ver1.3.0 Significant improvements to the weight value setting function, Add Vertex Table


Numerical value setting function, is now possible to switch between substitution / addition / subtraction, Symmetry, post-adjustment, and normalization.
Added a table that can display vertex weight list.
This feature is still unstable.


Significantly improved numerical value setting function

  • Added replacement / addition / subtraction options
  • Mirrored to X / Y / Z
    • Synchronize with brush symmetry settings
  • Post-adjustment of settings is now possible
  • As an option of normalization, we have to be able to select the “All Active not normalized”

Added vertex weight table (under development)

  • You can set weights by dragging
  • List selected vertices and vertex groups to which the selected vertex is assigned
  • This is unstable because it is under development
  • Blender crashes on objects with many vertices


  • Use custom values ​​that are not brush weight values
  • The weight setting method does not use the existing “set” operator
  • The menu can be collapsed
  • The panel is displayed even when not in weight paint mode.
    • Panel is hidden by default

Bug fixes

  • Fixed an issue that slows down when bones are selected during weight painting and the menu is displayed

I myself thought that the same part should be improved, so I improved it with ver1.3.0.

    1. symmetry
    1. Normalization of active only / Disabling normalization
    1. Numeric settings not related to brush weight

1. The pie menu cannot be used when selecting an armature

This was due to a conflict between the keymap and alt + F of Quaternions Flip (pose.quaternions_flip) in pause mode.
In the future, the pie menu will be overwritten even in pause mode, and it will be corrected by incorporating Quaternions Flip into the pie menu.

4. In the pie menu, add to the right and subtract to the left

Hesitates because the menu is too big.
Please try the button “Replace / Add / Subtract” next to image 0.05 in ver1.3.0.



About symmetry, I actually meant having mirroring weight for BONE.L after assigning manually to BONE.R, which is what we get when weight painting. But this kind of symmetry is one I didn’t realized users will also need!

Yeah, both Alt+F and Shift+G conflicts. Looking at User Preferences > Keymap > Filter by Key-Binding, many other combinations like Shift+X seems vacant. Or better yet (maybe), let user define their own hotkey through User Preferences. Seen many addons do that.

OK, I don’t know what I need. Tried your solution, and it works good enough for my purposes.

I see you used bpy.ops.object operators for these. I think there’s more can be done about this, there seems to be more options, will look into it.

If only mesh object is selected, vertex_group_normalize_all operator’s group_select_mode argument only accepts ALL.

But if an armature is also selected, other options are available:

  • BONE_SELECT: Normalize only selected pose bones,
  • BONE_DEFORM: Normalize all deforming pose bones.

It’s BONE_DEFORM that I meant by point #3 above. LWP already included the ALL option, so maybe you’d like to include them too if an armature is also selected.

Thanks for the add / subtract by increment feature, I already use them extensively for my works!

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Fantastic tool and for the price you cannot get any better, i will buy soon since i will need to do a lot of weighting.

This was so useful in Max.

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I think the Shift + X is good position and easy to press.
Adopt it and change the keymap.


understood. Implement BONE_SELECT / BONE_DEFORM options.
Thank you for that information :smile:

[Lazy Weight Tool] ver1.4.0 Numeric setting function

enhancement, menu addition for operators and extended vertex groups, etc.

Added normalization options to numerical settings. ・ Bug fixes for mirror options, changed pie menu to Shift + X, and added loop selection clicks similar to mesh editing.

Numeric setting

  • User can change each of the 7 values
    • You can change the default value with the leftmost Ⅴ icon
  • Value can be set to brush weight value
    • [●] icon at the top
  • Changed to not work for vertices belonging to locked vertex groups
  • [FIX] Fixed an issue where the mirror option was heavy due to a typographical error.

Added option types for normalization

  • Added “Lock active” option
  • Add only selected bones and only deformed bones
    • Selected Pose Bone
    • Deform Pose Bone
    • These two options require a bone to be selected

Simple brush menu

  • Displays weight, radius, and strength
  • Switch between smooth or hard brush shapes
  • Switch between mix, add and subtract brushes

Weight related operator menu

  • You can display the menu that was in Blender2.7x


  • Add mirror selection
  • Add half selection
    • Select the opposite side of the object axis
    • When used with a weight mirror, weight copying to the other side can be easily performed

Vertex groups that allow regular expression filtering

A 3-line vertex group search list is displayed side by side.
By default, it is displayed as follows.

  • Left row …… “ Vertex group not displayed in the middle row / right business”

  • Center line …… " Vertex group with .L at the end of the line "

  • Right row …… " Vertex group with .R at the end of the line "

  • Regular expressions are available

  • Rename can be done with Shift + click

  • [Known bugs] The list will not be scrollable, so there will be a long menu with a large number of vertex groups

Weight table

  • Added highlight function for specific weight value
    • There is a bug that does not work if the value after the decimal point is fine
  • A little lighter
  • Hide more than 2000 vertices to avoid apparent crash
  • The table function is not stable yet . Crash when selecting at once in box selection etc.


Change pie menu keymap to Shift + X

* Changed the keymap to Shift + X because there was a problem that the pie menu could not be used when selecting an armature

  • It was because there was a conflict between keymap and alt + F of Quaternions Flip (pose.quaternions_flip) in pause mode

Added loop selection and shortest path selection with double mouse click

Loop selection can be selected in the same way as mesh editing with alt + left mouse double click.

function Keymap
Loop selection Alt + double click left mouse
Loop selection (extended) Alt + Shift + left mouse click
Shortest path selection Ctrl + Shift + left mouse click

ver1.5.0 Weight table is now available

Major updates

The alpha weight table function can now be used normally.
Vertex weights and assigned vertex groups can be displayed in a table and edited.
Mainly the weight table function has been improved.

  • Fixed weight table crash
  • Added scroll function
  • Added function to add / delete vertices to vertex group
  • Change the display of only selected vertices to optional
  • Added option to exclude hidden vertices, etc.

Weight table improvements

Vertex weights and assigned vertex groups can be displayed in a table and edited.

Fixed weight table crash

  • Weight table no longer crashes
  • Added a scrolling feature to limit the vertex menu to be displayed at once and avoid crashes
  • It seems that it was due to the load of displaying a large number of menus at once

Added scroll function

  • Scroll number
  • When the number of numbers displayed at a time is 500 or more, a warning is displayed
    • Blender crashes when there are many menus to display at once

Added function to add / delete vertices to vertex group

  • Accessible from the + / - icon

Change the display of only selected vertices to optional

  • You can choose between selected vertices or all vertices

Added option to exclude hidden vertices


  • Separate weight table menu as separate panel
  • Split add-on files and organize them internally

Bug fixes

  • Fixed an issue where the keymap could not be edited in the add-on settings

Hi Bookyakuno,
I just purchased this tool because I come from a 3DS Max background so it feels really familiar to me.
I was wondering however if it would be possible to add a copy/paste function for mirroring weights also just like you have in 3DS Max?
Preferably with the ability to mirror based off of vertex selection and a mirror position tolerance.

copy / paste and Mirror Function

At this time, there are no plans to implement those features with this add-on.
Because, a similar feature already exists in the “Weight Paint Tools” add-on developed by JoseConseco.

(I haven’t tried it yet, so I don’t know how useful this is)

OK cool, thanks for the reply!
I have used his hair tool already and its pretty good so I will check this out for sure.

ver1.6.0 Update

Cell highlight strengthen / mesh selection function the support of the other mode

Strengthen the cell highlight function

In cell highlight function of, we added some Obushon.

  • Hit target is the same as the value
  • Hit the target is greater than or equal to the value
  • Hit the target is less than or equal to the value
  • Increase or decrease the number of digits allowed to
    • Resolved an issue that does not successfully hit the cell where there is a fine point
  • Eliminate the hit cell, an embossing

Also supports the mesh selection function in other modes

In mesh selection of image Paint mode and vertex paint mode, now supports the following functions.

  • Scaling
  • Shortest path selection
  • Loop selection
  • Link selection
  • Add pie menu (shift + X)

Add the function of the vertex group auxiliary function

  • “Add an empty vertex group of which is a pair of mirror”
  • “Delete empty vertex group of”

It can be accessed from the [∨] menu of the vertex group.
Implements on the basis of the function of the Scramble Addon.

Add a link selection

You can access from the L key.


Some of the features name, a description, translated into Japanese

Organize the display a menu of add-on set

Such as the key map add-on set menu from individually enabled or disabled can.

We have excluded the menu switching operation from the undo

Now to prevent unintended operation by the undo.


ver1.7.0 Improvement of set weight function / Bug fix / Display of vertex index

Set weight

Improved symmetry function

  • Adopted a more rational symmetry method to improve speed and eliminate defects

Added “clean” option

  • After performing set weights, you can remove the vertex group assignment for vertices with zero weight
  • Utilizes standard “clean” operators


  • As the number of items has increased, we have arranged the menu after execution
  • You can now access various options from the icon in the header
  • Fixed an issue where weights could not be assigned properly with locked vertex groups

Weight table

Added vertex index display function

  • You can now edit while watching the vertex number in the weight table
  • Accessible from the icon in the header of the weight table panel


  • You can now access various options from the icon in the header

Other changes and bug fixes

  • Added " Wait Gradient " and " Wait Transfer " buttons, which are standard functions, to the “Operator” panel .
  • In the regular expression vertex group, various search menus are summarized in the search icon.
  • Fixed regexable vertex group renaming not working in Blender 2.83

ver1.7.1 Added slider display option to weight table

Added slider display option to weight table

It makes it easier to see the weight strength.

You can disable it from the top right menu


  • Minor correction of brush menu layout

Bug fix

  • Fixed an issue in Set Weight where the individually configurable button next to Smooth reflected the main type setting instead of its own type setting
  • Internally, I modified and organized the file structure of the add-on

ver1.7.2 small improvement to the set weight

I updated a small improvement to the set weight function.
Better behavior when there is no active vertex group.

  • if no active vertex group exists, create new vertex group and add weight
  • and when the bone associated with the mesh is selected in pose mode, a new vertex group with the bone name is automatically added.