• Adobe After Effects Expressions

  Attach depth of field control to slider to expression

  Posted by Pawel Milewski on October 8, 2021 at 12:58 pm

  Hi

  Anyone knows how to attach depth of field control to slider in expression which generates automatically when “Link Focus Distance to Layer” is pressed. I want to have more control in depth of field.

  Expression goes like this:

  var usingLegacyEngine = !!$.version;

  try{

  thisLayer( “ADBE Transform Group” )( “ADBE Anchor Point” ).value;

  }catch(err){

  var quote = String.fromCharCode(34);

  if ( usingLegacyEngine ) {

  $.error = “” + quote + “Camera 1″ + quote + ” cannot be a One-Node camera”;

  } else {

  throw “” + quote + “Camera 1″ + quote + ” cannot be a One-Node camera”;

  }

  }

  var targetLayer = thisComp.layer(“Camera Target and Controller”);

  try{

  targetLayer.transform.position[2]

  }catch(err){

  var quote = String.fromCharCode(34);

  if ( usingLegacyEngine ) {

  $.error = “” + quote + “Camera Target” + quote + ” cannot be a 2D layer. The Focus Distance of ” + quote + “Camera 1″ + quote + ” can only be set to follow 3D layers.”;

  } else {

  throw “” + quote + “Camera Target” + quote + ” cannot be a 2D layer. The Focus Distance of ” + quote + “Camera 1″ + quote + ” can only be set to follow 3D layers.”;

  }

  }

  var cameraPosition = [transform.position[0] * thisComp.pixelAspect, transform.position[1], transform.position[2]];

  var cameraPoi = [transform.pointOfInterest[0] * thisComp.pixelAspect, transform.pointOfInterest[1], transform.pointOfInterest[2]];

  if ( thisLayer.hasParent ){

  cameraPosition = thisLayer.parent.toWorld( cameraPosition );

  cameraPoi = thisLayer.parent.toWorld( cameraPoi );

  }

  var targetPosition = [targetLayer.transform.position[0] * thisComp.pixelAspect, targetLayer.transform.position[1], targetLayer.transform.position[2]];

  if ( targetLayer.hasParent ){

  targetPosition = targetLayer.parent.toWorld( targetLayer.transform.position );

  }

  var cameraVector = sub( cameraPoi, cameraPosition );

  if( length( cameraVector ) != 0 ) {

  cameraVector = normalize( cameraVector );

  }

  var targetVector = sub( targetPosition, cameraPosition );

  dot( targetVector, cameraVector );

  Thanks in advance

  Pawel Milewski replied 4 years, 11 months ago 1 Member · 0 Replies
• 0 Replies

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