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Activity Forums Adobe After Effects making 2 seperate lights wiggle their intesity identically?

  • making 2 seperate lights wiggle their intesity identically?

    Posted by David Lieberman on January 2, 2008 at 9:22 pm

    i’ve got an expression of a wiggle for a spot light…im using two spotlights to represent one light, each one wiggles in the opposite direction with its intensity, but they do it at different times… is there any way to tell the wiggle expressions to be identical?

    both expressions are wiggle(3,100) but they both start at different times for some reason…

    thanks

    thanx for the help.

    Darby Edelen replied 18 years, 4 months ago 5 Members · 6 Replies
  • 6 Replies
  • Dan Ebberts

    January 2, 2008 at 9:41 pm

    One way would be to set the random seed to the same value in each expression, like this:

    seedRandom(1,true);
    wiggle(3,100)

    Or, just pickwhip one to the other.

    Dan

  • Alfonso Gamez jordano

    January 2, 2008 at 9:48 pm

    For an example of this, watch through the middle of the just published Aharon Rabinowitz tutorial 😉

  • David Lieberman

    January 2, 2008 at 10:12 pm

    mucho gracies guys!!! also, is there an expression that throws values more abruptly?? wiggle just seems pretty smooth…i wouldnt mind something that jumps from intensity of 50% to 115% nearly instantly and changes values very quickly…

    thanks again guys

    thanx for the help.

  • Alfonso Gamez jordano

    January 2, 2008 at 11:22 pm

    Well, with wiggle, you can control how quick it changes and how abruptly it does :S

    And, I don’t know how to do it through expressions, but by using The Wiggle window, if you set keyframes to Irregular rather than smooth, it will seem more abrupt, maybe helping you to achieve the look you’re after…

    🙂

  • Kyle Hamrick

    January 3, 2008 at 5:46 pm

    Exactly. Your basic wiggle expression works as follows:

    If we’re working on a property with only one dimension, which is the case here, your expression will look exactly like the one in your original post.

    wiggle(3,100)

    In this expression, the first number, 3, is the frequency, while the second, 100, is the amplitude. Meaning that your property will change 3 times per second, up to 100 units.

    If you want it to change faster, change the first number. Setting it to 30 would mean it will change every frame (asusming 30fps, of course.) Setting it to something like .2 gives a nice smooth drift – I use this all the time for that nice “drifty camera” look.

    If your speed is correct, but it’s changing too much or too little, simply change that second number (and/or the number we’re wiggling from) accordingly.

    That clear things up a bit?

    Kyle Hamrick

    Editor/Motion Graphics Artist

    http://www.kylehamrick.com

  • Darby Edelen

    January 5, 2008 at 6:23 am

    [Kyle11268o] “wiggle(3,100)

    In this expression, the first number, 3, is the frequency, while the second, 100, is the amplitude. Meaning that your property will change 3 times per second, up to 100 units.

    If you want it to change faster, change the first number. Setting it to 30 would mean it will change every frame (asusming 30fps, of course.) Setting it to something like .2 gives a nice smooth drift – I use this all the time for that nice “drifty camera” look.”

    Also, if you want to vary the frequency of the wiggle() consider linking the frequency to a Slider Expression Control which you can then animate (or even wiggle!) =)

    This would allow you to add some organic variation to the wiggle()

    Darby Edelen
    Designer
    Left Coast Digital
    Santa Cruz, CA

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