Editable motion trails let you preview your animation and interactively adjust keyframes within the 3D scene. Motion trails provide a visual representation of keys right around your animated models, letting you adjust the timing, keys, tangents, and position of animation directly.
See Modify keys or tangents on a motion trail for more information on editing keys, tangents, and timing beads on your motion trail.
You can display interactive tangents on the motion trail for any key with editable tangent types (Spline, Linear, Clamped, Flat, Fixed, Plateau, and Auto). You can have both the In Tangent and Out Tangent displayed at the same time for a selected keyframe.
You can display and adjust timing beads on a motion trail to control the ease-in and ease-out of your animations at each keyframe. Each bead represents one frame in time. By adjusting the spacing of timing beads on either side of a key, you can slow or speed up the movement of the object as it approaches and moves away from the key. Stretching out the timing beads slows the movement of the object into or out of the key, while compressing the beads speeds the movement up.