non-constant segments A sequential pair of keyframes used to key the same type of attributes creates a segment. For example a beginning location keyframe and the next location keyframe sequentially located on the same element peg are connected by a segment. The length of the segment depends on the number of in between frames. The purpose of a connecting segment is to define the method of "tweening" for the in between frames between the two keys. When we as animators want the render engine to create in between changes between our keys we designate the connecting segment to be a non-constant segment. We can then choose to use the default spacing for our in betweens which is linear (equally spaced in betweens) or using the Function Editor panel we can assign a different velocity function curve to specify the desired in between spacing. In the example shown the velocity curve is a typical ease in/out. The equivalent standard timing diagram for this type of spacing is shown where in betweens following the first key are spaced closer to that key and in betweens just preceding the second key are spaced closer to that key. This type of timing is typical for showing a slow start moving up to an even speed and then a slow down into the final pose. This is a very natural acceleration and deceleration in organic motions.











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