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Bones are the base elements of armatures. The visualization of bones can be set in the Armatures Viewport Display.

Classification

Bones in an Armature can be generally classified into two different types:

1. Deforming Bones

2. Control Bones

Deforming Bones

Are bones which when transformed will result in vertices associated with them also transforming in a similar way. Deforming Bones are directly involved in altering the positions of vertices associated with their bones.

Control Bones

Are Bones which act in a similar way to switches, in that, they control how other bones or objects react when they are transformed. A Control Bone could for example act as a sliding switch control when the bone is in one position to the left, it could indicate to other bones that they react in a particular way when transformed, and when the Control Bone is positioned to the right, transforming other bones or objects could do something completely different. Control Bones are not directly used to alter the positions of vertices; in fact, Control Bones often have no vertices directly associated with themselves.