Principles Of Animation - Arcs

Posted at Jul 25th, 2013 by AnimDesk.

Very few living things on Earth include the ability to move in a fixed motion or movement. Most of them move in a circular path. During a fixed movement, different parts in their body: head, arms, legs, chest; will move straight and back again. These movements are affected by various attributes: weight, height, or shape of the skeleton; In the end, they will create an arc to finish their movement.

Once discovered, Animators have changed the way they move their characters on the screen. They began to break away from rigid and stiff movements and made their characters looser.

Example for this movement is the walk cycle. Before discovering the arc movement, characters used to walk upward and downward, just as an engine piston does.

Animation with an Arc.Animation without an Arc.

Once understood an Animator starts the walk action with an arc and end it with the "Follow Through" principle for the full movement.

Animators in time designed their scenes with dots and signs and as well as rough poses. This helped the Animator figure out how high or low their characters need to drawn in the scene. Even with experience, creating an arc movement was still hard to coordinate and control.