 Using the speed of a layer to drive an effect | ||||||
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If you want to use the speed/velocity of a layer's movement to drive an effect ...
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After Effects CS3 Useful things Expressions Views: 9184 Permalink | ||||
If you want to take the speed for a layer's postional value, you can use the following expression
For example, if you are moving a layer through a comp, and want the speed of the movement to influence the brightness of the layer, you would just copy and paste this expression to the "Brightness and Contrast" filter, in the Brightness parameter. Why the /3-50? Simply because the speed of the layer's position is expressed in 100's (i.e the speed can go from 0 pixels/s to a quite large amount), whereas the brightness goes from 0 to 100. So if you divide the values for speed by 3, you arrive to a decent value for brightness (the brightness won't be overblown). The -50 adds more control to this, putting the brigthness down by 50. You could change this for any other number, depending on your needs, but you could also not use it and divide the speed by 5, or more. by malex Keywordsspeed, velocity, movement(Min. Version: After Effects CS3, Category: Useful things, Type: Expressions) | ||||||
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posted by MicGyver on Oct 15, 2009
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Kinetic Text Expressions | |||
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The expressions simply check the velocity of your animations. If you move an objects motion ends abruptly (ie: you didn't easeIn @ 100%) the physics will kick in automatically.
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After Effects CS4 Design/Objects Expressions Views: 44684 Permalink | |
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posted by MicGyver on Jul 30, 2011
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Clouds Presets for AE | |||
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5 realistic clouds in AE with no external plugins.
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After Effects 6.5 Design/Objects Presets (ffx) Views: 20448 Permalink | |
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posted by inerxia on Feb 21, 2009
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