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Drivers
Drivers are functions or scripts which use properties (values) to affect other properties. This control is particularly applicable when animating. Drivers are used to control the animation of one property based on the value of another.
For example, the rotation of one object may be used to control the translation of another object. This means that the objects animated value Is not controlled by the frame number interpolated from Keyframes, but rather by the data in a specified animation channel. Drivers can take their effects from single properties, differences in rotation or scripted Python expressions which may be edited inside the User Interface controls.
Drivers are not limited ...
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