Check: Skin Weight Normalization

Version:

Severity: Warning

Error message: Skin weights per vertex do not sum up to 1.

Description

Normalizing weights is recommended for smooth animation deformations.

The linear sum of the weights should be as close as reasonably possible to 1.0 for a given vertex.

The threshold in the official glTF validation tool is set to 2e-7 times the number of non-zero weights per vertex.

Automatic Fix

Normalize Weights

Normalizes the bone influences, i.e. for each vertex, this fix makes sure that the sum of the weights across all vertex groups is equal to 1.

Actions: Select Vertices

Select vertices with non-normalized skin weights.

Manual Fix

Re-adjust the weights.

Tip

While painting weights In Blender, you can turn on Auto Normalize in the settings of the Draw tool under Options to avoid this issue while painting skin weights.

Properties

Hosts: Blender

Types: Mesh