movement-notation.org

Movement instructions may contain an explicit description of the movement path taken for the single limb.

Movement paths of single limbs can be classified, depending on the angular relation of the limb axis to the axis of movement, as either

• plane movements
• conical movements
• or rotational movements.

• Traditional key frame animation is able to generate plane movements and rotational movements. But if the angle between a limb’s start and end position is equal or larger than 180° degrees, additional in-between frames need to be defined to clarify the passage from one point to the next.

• Conical movements are actually longer, circular connections between two points. Determining the movement path by simple interpolation is not applicable to this type of movement by definition, and thus it cannot be represented at all by the key frame approach.

The following animation example is generated by the animation engine and contains several of those movement types, that are problematic in key frame animation.

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