• Adobe After Effects Expressions

  Would an expression be useful for swipe effect or is just a matter of setting up keyframes.

  Posted by Chris Law on April 27, 2015 at 11:03 am

  Hello, I’m trying specifically the swiping effect, (linear wipe) used here https://www.youtube.com/watch?v=CAsj7kDGqNU

  Now I know how to make the wipe effect, either masking the layer and animating the mask path or using a linear wipe transition effect. The problem is I can’t seem to get it looking as fluid as this advert. The wipe effect almost sort of bounces a little bit over where its supposed to cover and whips back and that’s the effect I’m after. I was thinking an expression was used or some clever use of key frames. I’m getting not too bad results with easy ease key frames but anyone has any idea how to get very close to the speed and motion of the effect I would really appreciate it.

  Thanks for your help.

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  Kevin Camp replied 11 years ago 2 Members · 3 Replies
• 3 Replies

• 

  Kevin Camp

  April 27, 2015 at 8:45 pm

  i think you can get pretty close using easy ease and then adjusting the keyframe velocity to make the ease more extreme.

  ex:

  • add linear wipe to a layer and set a keyframe at 0% complete.
  • move down the timeline 10-20 frames and set the completion to 60%
  • then move down the timeline another 10-20 frames and set it back to 0%.
  • make the middle keyframe (60% keyframe) an ease-ease keyframe, and then right-click on it and choose ‘keyframe velocity’ and set both influences to 100%.

  i think that gets pretty close to your example.

  Kevin Camp
  Art Director
  KCPQ, KZJO & KRCW
• 

  Chris Law

  April 27, 2015 at 9:12 pm

  Hey, thanks for your help. I managed to get the effect working well by having a normal keyframe, followed by two easy ease for the end of the increase and the decrease. I then went into the graph editor and made the curve towards the decrease more steep.

  I was wondering what does this key frame velocity influence do exactly?

  Regards
  Chris
• 

  Kevin Camp

  April 27, 2015 at 11:36 pm

  keyframe velocity is pretty much the same thing as pulling the handles around the graph editor, just doing it by editing values…

  if you were to do the same set-up that i mentioned earlier, up to the creating the easy-ease keyframe, but then went to the graph editor (speed graph) and extended the handles for that keyframe to 100%, it would be the same as entering 100% in the keyframe velocity window.

  Kevin Camp
  Art Director
  KCPQ, KZJO & KRCW

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