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Forums Adobe After Effects Expressions tracing a mask and lens flare

  • tracing a mask and lens flare

  • marcosh

    April 26, 2005 at 7:33 pm

    Hi everyone,

    I just drew a mask (outline) surrounding a an object on AE and I want to have some sort of lens flare or an effect such as a Light Factory’s LE “drawing” the outline of my object. I think I may be able to do that using some sort of basic expression (using the pickwhip). But I can’t remeber what “tracing/paiting” effect I should use so I see my path being “drawn”… Any suggestions?

    Thanks

    Marcos H.
    After Effects Pro 6.5

  • Steve Roberts

    April 26, 2005 at 8:05 pm

    Select the mask shape parameter in the timeline. Copy. Select the “flare center” parameter of the lens flare effect. Paste. The flare center should now follow the mask.

    For the line growth, apply render>stroke to the mask layer and animate the end point of the stroke effect. You’ll have to sync it by hand.

    Steve

  • Dan Ebberts

    April 26, 2005 at 8:10 pm

    This might give you some ideas. Select your mask shape, copy it, and paste it into the “Flare Center” attribute of a Lens Flare applied to another layer. That will give you a 2-second animation of the flare moving around the mask. Set that layer’s blending mode to “Screen” so you can see the layer with the mask. Apply Stroke to the layer with the mask and keyframe the “End” parameter going from 0 to 100%, with it reaching 100% at the last keyframe of the Lens Flare.

    Dan

  • Dan Ebberts

    April 26, 2005 at 8:11 pm

    Great minds…. 🙂

    Dan

  • Steve Roberts

    April 26, 2005 at 8:30 pm

    Heh … you honor me, fellow tux-man.

    Steve 🙂

  • marcosh

    April 27, 2005 at 2:28 pm

    Thanks a lot, Dan! Thanks, Steven! I’m already putting in practice your tips… I didn’t know you could paste a “mask” onto a parameter such as position. That makes it much easier!

    Marcos H.

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