Creating a Path with Constant Velocity
When you change the time at which a keyframe occurs, for example by moving the keyframe indicator in the Timeline, the length of time it takes the effect to move from the position set in that keyframe to the position set in the next keyframe also changes. Most of the time this is the result you want.
If you want an effect's path to have a constant velocity across a number of key frames, you can make the calculations manually and place the keyframes accordingly, or you can use the Constant option for the Velocity parameters.
When you use the Constant option, your Path parameter selection can affect the result of changes you might make to the effect.
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If you select Linear for the Path parameter, moving keyframes or
changing the Position parameters does not affect the velocity of the
effect's path.
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If you select Spline for the Path parameter, moving keyframes or
changing the Position parameters might affect the velocity of the
effect's path.
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For more information, see
Setting the Path Parameter.
To create a path with constant velocity:
| 2. | |
Add keyframes to define the path you want the effect to take.
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| 3. | |
At each keyframe, set the Velocity In and Velocity Out parameters to
Constant.
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When you use Constant for Velocity In and Velocity Out, the position at
which you placed a keyframe in the Timeline is not necessarily the time at
which the Avid Pan & Zoom effect applies the keyframe's parameters. The
effect applies the parameters at the time calculated by the effect to achieve
a constant velocity for the path you created.
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| 4. | |
Press the Play button or the Play Loop button to preview the effect.
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The velocity of the path is constant.
