Tweener is a tool similar to TweenMachine or aTools/animBot. It allows you to quickly create inbetweens or adjust existing keys by interpolating towards adjacent keyframes, and can speed-up your workflow when creating breakdowns and inbetweens.

Maya 2017 Update 3 or later.

Download tweener-install.py and drag the file into Maya's viewport. If you prefer to manually install the plug-in, refer to the Installation wiki page.

The Tweener tool can then be opened from the shelf or with the MEL command tweener;

The tool window consists of the various in-between modes, additional features, presets and the slider used for favouring the pose before/after.

Icon	Mode	Description
	Between	Interpolates between two adjacent keys, ignoring the current key.
	Towards	Interpolates towards two adjacent keys based on the current key.
	Average	Interpolates towards the average value of the selected keys.
	Curve	Interpolates along the curve formed by the two adjacent keys' tangents.
	Default	Interpolates towards or away from the default value of each attribute.

Icon	Name	Description
	Overshoot	Extends the interpolation from [-100:100] to [-200:200] and allows you to go past the target.
	Key Hammer	Adds a key for every attribute for any key on selected objects. The manual equivalent method would be to go to the first key and press S, go to the next keyframe and press S, go to the next keyframe and press S etc. for every keyframe.
	Special Tick Color	Sets the current frame, selected keys, or time range to the special keyframe tick color.
	Normal Tick Color	Sets the current frame, selected keys, or time range to the normal keyframe tick color.

• in-between modes
• features
• hotkeys
• installation
• uninstallation