• Adobe After Effects

  Trapcode form / particular emanating from alpha edge

  Posted by Declan Smith on October 28, 2013 at 2:06 pm

  Could anyone help with a starter for 10 on how I can setup either form or particular to emanate particles from the edge of an alpha channel. i.e. the alpha channel of a green screened clip so that particles flow outwards from the edges of the object.

  Declan Smith
  https://www.madpanic.tv
  After Effects CS6/ FCS3 / Canon XLH1 / Canon 7D / Reason / Cubase

  “it’s either binary or it’s not”

  Declan Smith replied 12 years, 9 months ago 2 Members · 2 Replies
• 2 Replies

• 

  Roland R. kahlenberg

  October 28, 2013 at 6:28 pm

  You need two thingies –
  1) an outline that defines the edge – sorta like a stroke effect around just the edge of the area. You will need this layer to have an Alpha Channel to define the transparent and opaque areas.

  2) the layer in (1) has to be a 3D layer or Particular to use it as a Layer Emitter.

  Particular’s Help Doc which is accessible via its Options hyperlink (Effect Controls Panel) provides other relevant information on the topic.

  HTH
  RoRK

  Intensive mocha & AE Training in Singapore and Other Dangerous Locations

  Imagineer Systems (mocha) Certified Instructor
  & Adobe After Effects CS6 ACE/ACI
• 

  Declan Smith

  November 4, 2013 at 3:23 pm

  Great, thank you, meant to send this last week. The bit I was missing was setting the layer to 3D. All working now.

  Declan Smith
  https://www.madpanic.tv
  After Effects CS6/ FCS3 / Canon XLH1 / Canon 7D / Reason / Cubase

  “it’s either binary or it’s not”

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