• Adobe After Effects Expressions

  Getting to grips with velocity.

  Posted by Jamie Bradshaw on March 9, 2018 at 12:52 pm

  Hi all.

  To help explain, I have a property that is being animated with an expression. However, I want to amend the expression so that it can use it’s velocity at a certain time to also affect it. As it is an expression that is looking at itself, velocityAtTime won’t help me.

  As a test I added an expression that created two variables, (A) and (B); (A) being the value at time(t – 0.0001) and (B) the value at time(t). It then works out the velocity with a simple bit of code along these lines: (B – A) / 0.0001

  To then test if this was giving me correct results, I then created another layer with an expression to look at the same property that used velocityAtTime(t – 0.0001). Whilst the results are close, they are not the same. Would anybody know why?

  Here is a link to a project file to help explain my issue:
  12233_velocitytest.aep.zip

  Jamie Bradshaw replied 8 years, 1 month ago 1 Member · 0 Replies
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