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The simplest form of interpolation is linear interpolation.

The linearly interpolated value of a parameter specified by two points (t1, v1) and

(t2, v2) at arbitrary time t in the range [t1, t2]

is

v = (t - t1)/(t2 - t1)*(v2 - v1) + v1

The robot-anim.c example uses linear interpolation, and has the above calculation

in it

Linear interpolation has problems when used for animation in that motion described

by segments of linear interpolation is "jerky" and unrealistic. The jerkiness occurs

because the rate of change of the parameter being interpolated is discontinous.

To overcome this, and to achieve greater control and more entertaining effects,

other types of interpolation may be used.

Typically this is by using quadratic or cubic curve segments, that is, splines

ntroduction to Animation file:///mnt/home/gl/gl-gentoo/subjects/cosc%7B118...

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