Blocking is an animation technique in which key poses are created to establish timing and placement of characters and props in a given scene or shot. Blocking is most commonly used in 3D computer animation.
Blocking is often the first step in the pose-to-pose style of animating, as opposed to the straight-ahead style of animation (though blocking sometimes plays a role in straight-ahead as well.) Blocking poses are not necessarily exclusively keyframes. Blocked-in poses may also include important in-betweens, extremes, and breakdowns necessary to establishing the flow and timing of a particular shot.
In 3D, the animation curves of a blocked shot are often created using stepped or square tangencies, which provides no interpolation between animation poses. This allows the animator to see the poses of the animation without any strange and/or unintentional automatic interpolation. While this is sometimes problematic due to gimbal lock, seeing the poses in this way allows the animator to adjust the timing of an animation quickly, without the distraction of the software's automatic interpolation.
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