kNeutralWeights top-level property
Vector4
kNeutralWeights
final
All the influence on the first joint.
Not all zeros: weights that sum to zero collapse the vertex to the origin, so a mesh missing WEIGHTS_0 would implode rather than simply not deform.
Implementation
final Vector4 kNeutralWeights = Vector4(1.0, 0.0, 0.0, 0.0);