• Adobe After Effects Expressions

  Colour: numlayers/index

  Posted by Conor Flanagan on March 25, 2020 at 8:39 pm

  Hi all,
  I really didn’t want to have to write this but I’m stuck and the key terms to search with are very vague.

  So I’ve used a version of this expression before on many different projects, but I am now trying to get it to work for colour.
  I want to basically have the lightness of the colour divide among the total layers in a comp.

  So for example 10 layers, the lightness will increase in increments of .1
  And adjust dynamically as more layers are added.

  Now I’ve gotten this work up until I add the *i
  For whatever reason multiplying by the index breaks it. No error though, just reverts to default value. I remove the *i I get the result of 1/n

  Is index broken? Am I broken?

  I created a more hackery way for the job I was doing, but now I just want to know how I was being stupid.

  Cheers all.

  n = thisComp.numLayers;
i = index;
h = 0
s = 0;
l = (1/n)*i;
a = 0;
HSL = [h,s,l,a];
hslToRgb(HSL);

  Conor Flanagan replied 6 years, 5 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Andrei Popa

  March 25, 2020 at 10:06 pm

  This works great on my pc. However, since it is the i that gives you trouble, you can try changing it like this:

  n = thisComp.numLayers;
h = 0
s = 0;
l = index/n;
a = 0;
HSL = [h,s,l,a];
hslToRgb(HSL);

  Andrei
  My Envato portfolio.
• 

  Conor Flanagan

  March 26, 2020 at 9:27 am

  doh….
  I did restart AE but not the computer.
  Sorry.

  But of course index/n. I was worried about numbers exceeding 1, but you’ll never have more than the total.

  Thank you for the sanity and math check Andrei.

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