tweening

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tweening

(graphics)
An interpolation technique where an animation program generates extra frames between the key frames that the user has created. This gives smoother animation without the user having to draw every frame.

A scene is described by a mathematical model - a set of two- or three-dimensional objects whose positions in are given by sets of coordinates. Tweening uses mathematical formulae to generate these coordinates at a sequence of discrete times. The simplest system would move each point at a constant rate in a straight line between its initial and final positions, though other kinds of path are possible. The coordinates at each time step are used to generate (or "render") a two-dimensional image of the scene which forms one "frame" of the animation.

Tweening is similar to morphing except that morphing is usually performed by interpolating between corresponding points marked by the user on two images, rather than between two configurations of a model.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

tweening

An animation technique that, based on starting and ending shapes, creates the necessary "in-between" frames. See morphing.
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References in classic literature ?
She was so busy in admiring those soft blue eyes, in talking and listening, and forming all these schemes in the inbetweens, that the evening flew away at a very unusual rate; and the suppertable, which always closed such parties, and for which she had been used to sit and watch the due time, was all set out and ready, and moved forwards to the fire, before she was aware.
In the case of The InBetween, a new supernatural crime drama series that premiered over Blue Ant Entertainment last Friday, it is essential.
The collision involved at least four vehicles and happened inbetween the Edgebold and Dobbies roundabouts at about 3.30pm yesterday.
Mya-Lecia, who appeared in shows including Millie Inbetween, died on April 7 but the cause of death remains unclear.
Naylor, who appeared in shows including Millie Inbetween and Almost Never, died on April 7 but the cause of death remains unclear.
One of Mya-Lecia's Millie Inbetween co-stars, Rhianna Meralls, described her shock at the tragic news, saying that cast of the CBBC show is "heartbroken".
MYA-Lecia Naylor, star of CBBC hits Almost Never and Millie Inbetween, has died aged 16.
Taffymctaff So sorry for your loss, today I was on the m4 near Bridgend when a boy racer was cutting inbetween cars doing around 90mph - these people need their licence taken away from them asap.
and everything inbetween. What probably clinched it for Mennock came in the food and drink round when Sharon Readman answered the question: "In Australia, what is a sinker?" Without hesitation, she answered - a meat pie.
And when they returned, they still weren't - but only just - because the determined council painter did the job at either end, and inbetween.
Inbetween." The season will only have six half-hour episodes that follow Ray (Scott Ryan), a man trying to balance work and family.