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This type of application enables the creation of animation by manipulating a skeletal structure underlying a two-dimensional character or object. Instead of redrawing elements for each frame, animators can define a series of interconnected bones and joints. The character’s sprite is then bound to this skeleton, and movements are achieved by rotating and translating the bones. For example, bending an arm is accomplished by rotating the “upper arm” and “forearm” bones at the “elbow” joint, causing the connected sprite to deform accordingly.

The use of skeletal deformation streamlines the animation process, improving efficiency and enabling complex, realistic movements. This approach reduces the need for frame-by-frame drawing, which can be time-consuming and resource-intensive. It facilitates iterative adjustments and refinements, as changes to the skeletal structure automatically propagate throughout the animation. Historically, this methodology evolved from techniques used in 3D animation, adapting them to the specific constraints and possibilities of a 2D environment. This significantly expanded the scope and sophistication of 2D animated productions.

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