• Adobe After Effects Expressions

  null position to layername problem

  Posted by Raphael Schaaf on April 28, 2011 at 6:34 pm

  Hi,
  I wanted do add some new features to a script I wrote some weeks ago.
  Every time I run the script it takes the 2d moving of 2 selected nulls and puts it into a new null that moves in 3d space…

  This workes fine, but I now tried to add something that counts how many times I used the script and puts this number at the end of the name of the new null.
  I use the x-position of another null (placeholder) to count, but the expression for the position doesn’t get written and every time I try another way to get the position into a layers name, it’s 0, NaN or some other error.

  I ran on the problem with the expression not geting written when I wrote the first script, but strangely it worked fine the next day, without any changes in the script. Maybe this part will work tomorrow…

  var thisComp = app.project.activeItem;
var plchldr = thisComp.layers[3];
var plchldrname = plchldr.name;
var plchldrpos = plchldr.position;
var plchldrexpr= plchldrpos.expression;
var placeholder = new String ('placeholder');
var aufrufe = 0;

  if (plchldrname == placeholder) {

  var pos = plchldr.position[0];
  var aufrufe2 = pos + 1;
  var plchldrexpr = 'value + [' + aufrufe2 + ',-100];';
  newTrackpoint.name = trackName + aufrufe2;

  }else{

  var newplchldr = thisComp.layers.addNull();
  newplchldr.name = 'placeholder';
  newplchldr.position.setValue ([1,-100]);
  newplchldr.moveAfter (thisComp.layers[3]);
  newTrackpoint.name = trackName + aufrufe;
  }

  Txus Da silva replied 14 years, 2 months ago 2 Members · 1 Reply
• 1 Reply

• 

  Txus Da silva

  March 5, 2012 at 2:07 pm

  i have posted twice b4 but seems it doesnt like my posts…

  I´m actually performing a similar thing like yours when i stumbled onto this code… Its exactly what i need but im terrible w any scripting…

  im using 2 tracking NULLS.. lets call it NULLFRONT and NULLSIDE

  Im using
  NULLFRONT XY
  and
  NULLSIDE X as Z

  where do u place this script?
  whats the call for the different layers?

  Thanx in advance yours Tx

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