Page 444 - ProShow Producer 9 Final Manual

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The Rotate Center can be changed at different points in your slide time,
causing the point to travel as the layer moves. If the layer is rotating while
this takes place, the center point of the layer will move and adjust the
rotation in real time. For even more custom movement, you can even enter
values beyond plus or minus 50; placing rotation points outside of the
boundary of the layer.

It’s a very powerful feature but it takes some experimenting to get a strong
sense of how it works. Feel free to try moving the Rotate Center around as
you rotate or tilt a layer and see what you get.

Curve

ProShow automatically makes your motions look more organic and natural
by adding some curve to their motion paths. This means that abrupt
changes in direction are softened into gradual sweeps. This does not
control the smoothness of your playback. Rather, it controls how ProShow
smoothes the motion between multiple points.

While setting a curve is nice to have in most cases, there are situations
where having too much curve might prevent an effect from working the
way you intend. If you were making an effect that had very mechanical
attributes, for example, you might want very precise and linear motion.

The best way to see Curve in action is to create some motion and then
enable the Motion Path.