• Adobe After Effects Expressions

  walk cycle accumulation distance

  Posted by Adrian Germain on July 15, 2009 at 4:21 pm

  Hi.
  I’m trying to animate a character and so far i made the whole movement to look realistic. Now, i have a problem with the distance he walks.
  Because it is symmetrical designed i set the angle of the right upper leg to a null slider and after i have applied this expression to the null position that have parented the character.

  t=degreesToRadians(comp(“right foot”).layer(“Null 1”).effect(“upper leg angle”)(“Slider”));
  m=2*effect(“distance factor”)(“Slider”)*Math.tan(t);
  [transform.position[0]+m,transform.position[1]]

  i need to mention that instead of calculating the distance from the anchor of the leg to the floor i decided to tweak a slider named distance factor.

  now it comes the problem. i think i need an expression related to accumulation not to have this ping-pong move. i remember Dan helped me one time with something similar:

  accum = 0;
  f = Math.round(time/thisComp.frameDuration);
  for (i = 0; i
  t = i*thisComp.frameDuration;
  accum += m.valueAtTime(t);
  }
  where m is the distance.

  i don’t figure how to adapt this>
  many thanks for any help.

  Adrian Germain replied 16 years, 10 months ago 1 Member · 0 Replies
• 0 Replies

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