Fitting Panel

The Fitting Pannel

The original SL Rig contains a set of special bones (Collision Volumes, also named Fitted Mesh Bones) which can be used to add more flexibility to Mesh attachment shaping in combination with the Shape Sliders. The rig is organized in pairs of bones which we will name FittingBones from now on. Each FittingBone pair consisting of a regular deform Bone mBone and a corresponding Collision Volume cBone.

In the fitting panel you find the corresponding tools for modifying the FittingBones. Especially you find the list of FittingBones in the Slider section at the bottom of the panel (see image)


Tip: The Fitting Panel is best used together with the Appearance panel. You should have both panels open and visible in the Tool Shelf.

Fitting Presets

You can store the setup of your Fitting Sliders into Presets. We have already added 3 Presets for your convenience


Default Presets

  • Fully Classic: Only Weights on mBones
  • Fully Fitted: Only weights on cBones
  • Half Way: Weights distributed to mBones and cBones

Apply immediately

This option makes the Fitting Sliders interactive. When you enable this option then slider changes will automatically be propagated to your meshes.

Hint: While this gives you instant feedback on how a fitting slider will change your mesh, it also takes a lot of your computer power to calculate the changes. So be prepared to find your Blender becoming slow while you are fitting.

Physics Sliders

Some of the Collision Volumes have been added to simulate gravity (physics). This is implemented for Pecks, Handles, Backbones and Butt

By default Avastar does add weights to the physics bones. However we provide a Physics generator which adds Weightmaps for the physics bones.


When physics has been generated, you get 4 new Fitting Sliders for Butt, Pecs, Back and Handles. You use those sliders to adjust the weights for the specific regions.

Hint: The sliders are split into 2 sections:

  • Left – Center: Increase strength of weights
  • Center – Right: Pinch the weighted area

By default the Handles get no Weight (as recommended by LindenLab )


Strength Sliders

The strength Sliders move your weight values of each FittingBone pair (see above) between the mBone and the corresponding cBone.

  • Slider – Left: All weight is on the mBone
  • Slider – Right: All weight is on the cBone

Note: By default the sliders do not affect your mesh shape instantly. If you want to see how the modified weightmaps affect the shape, you need to click the button Apply Shape at the bottom of the slider section. Unless you have enabled Apply Immediately (see above).

At the top of the Slider section you find 3 filter buttons for resticting the Display to:

  • The Selected Fitting Bones
  • The Weighted Fitting Bones
  • All Fitting Bones


You can store the slider settings into Presets (see further up on this page)

Fitting Tools (Smooth Weights)

The Smooth Weights option tries to smooth the surface of your mesh by moving the weight values between mBone and cBone for each vertex separately.



The Fitting sliders only work if there is weight on your bones.

Because of this you always have to provide a basically weighted Mesh. Best practice is: Weight your Mesh to the mBones only and make the weighting as perfect as you can for one specific Shape. Only when your basic weighting works nicely switch over to the Fitting Panel and adjust your weights.

The Smooth Weights Tool does not always work

Sometimes the Smooth Weights tool can not optimize the weights for some of the vertices. In that case all you can do is to smooth the mesh itself with the mesh tools instead of relying on the Smooth Weights tool.