• Adobe After Effects Expressions

  How to setValue to Trapcode particular size over life?

  Posted by Clifford Li on February 15, 2017 at 3:43 am

  Hi everyone,

  I am writing a script to drive “Trapcode particular” plugin.
  Other properties like “Particles/sec”, I can simply write – property(“Particles/sec”).setValue() to drive the value.
  But the .setValue() not working on “Over Life” type parameter, such as “Size over Life” or “Opacity over life”.

  So, how can I set the value to these “over life” by script?

  Xavier Gomez replied 9 years, 2 months ago 3 Members · 6 Replies
• 6 Replies

• 

  Dan Ebberts

  February 15, 2017 at 2:30 pm

  My guess is that those are a custom data type, so you won’t be able set those with a script.

  Dan
• 

  Clifford Li

  February 15, 2017 at 5:16 pm

  Hi Dan,

  Coz I found some script at least can set value to pick the “presets” of “size over life”. (It kinda like drop down menu)

  But of course it’s a jsxbin file…
  So I am actually wondering how script can set value to “size over life presets menu”.

  Clifford
• 

  Dan Ebberts

  February 15, 2017 at 5:38 pm

  Your script could apply a preset (.ffx) that has that parameter specified.

  Dan
• 

  Clifford Li

  February 16, 2017 at 3:38 am

  Nice idea, Thank you Dan
• 

  Clifford Li

  February 17, 2017 at 11:08 am

  Nice idea, Thank you Dan
• 

  Xavier Gomez

  February 18, 2017 at 2:59 pm

  Shot in the dark as i dont have particular:
  Reading your description of the parameter (dropdown), you could try setting the value as an integer (1 for first choice, 2 for 2nd choice, etc):

  myProperty.setValue(2);

  (For dropdown properties, the string is only a display info, what counts internally is the index of the menu item).

  Xavier

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