Interpolation

 

Interpolation is a method of calculating character poses in the frames between two keys to create smoother motion.

Interpolation Intervals

Interpolation is applied to groups of sequential frames known as Interpolation Intervals.

An interpolation interval is always limited by two key frames: one marking the beginning of the interval and another at the end of it.

To create an interpolation interval:

  1. Select several frames on the Timeline
  2. Choose a type of interpolation from the menu

The in-between frames will be generated automatically

Each interval on the Timeline can use a particular type of interpolation

Note how different types of interpolation affect the trajectory of the object

Types of Interpolation

A type of interpolation can be described as a rule used to create in-between frames on an interval. Keyframes set start and end positions, but how the object moves between these positions is defined by the type of interpolation.

Cascadeur supports several types of interpolation:

Step Interpolation (default)

In-between values are not calculated, animated objects only change their positions and poses in keyframes.

Frames with Step interpolation are colored white on the timeline

Linear Interpolation

Objects move between the specified the keyframes with constant speed.

Frames with Linear Interpolation are colored beige on the timeline.

Bezier Interpolation

Objects move along a curve defined by their positions in the key frames, accelerating at the beginning of the trajectory and decelerating near the end of it.

When this type of interpolation is selected on multiple intervals, character movements on previous intervals can influence subsequent ones, producing an effect similar to moving by intertia. This can make movements look more realistic, but in case this effect is not desired, use Bezier viscous interpolation type instead.

Frames with Bezier Interpolation are colored with a light blue shade.

Bezier viscous Interpolation

This type works in the same way as the Bezier interpolation, but previous movements influence subsequent ones to a lesser degree.

Fixed Interpolation

This type can be used when you want to edit a character pose on a regular frame of the interpolation interval, instead of the keyframe. This way you can adjust poses between key frames without creating additional keys.

Frames with Fixed Interpolation are colored green.

Mixed Interpolation

This type of interpolation is used to combine several types of interpolation on one interval.

For eaxample, when several animation tracks are combined into one, Mixed interpolation is used to preserve all movements on all combined tracks.

IK and FK Interpolation

Cascadeur supports both IK (inverse kinematic) and FK (forward kinematic) interpolation, and you can use any of these on any Interval.

To switch between IK and FK:

  1. Select an interval
  2. Click IK or FK button at the top of the timeline.

Note: If tracks on this interval have different types of interpolation, Mixed mode will be used

 

See Also

Timeline

Tracks

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