Skip to main content
D
dose0D45
Participating Frequently
March 10, 2021
Answered

Write-on effect: coordinates not changing.

  • March 10, 2021
  • 1 reply
  • 388 views

Hello!

I want to use the write-on effect on a robot-like arm that moves in circles, and i created the arm by parenting objects to each other. I then parented an object to the end of the arm and attached the write-on to this. So everything moves when I animate the rotation of the objects but the write-on is not writing. And I assume it's because the move-coordinates of the object on the end of the arm are not changing.

 

Does this make sense, and is there a way around this??

 

This topic has been closed for replies.
Correct answer Mylenium

You completely misunderstand. A Null is a non-rendering layer type to begin with and Write-On does not trace the layer motion. You need to apply the effect to a solid covering the entire comp and connect the effect's internal crosshair control with a pickwhip expression. In addition, however, you may need to use a layer space transform like toComp() and additional math to compensate for the positioning of the shape layer groups and the different coordinates used.

 

Mylenium

1 reply

Mylenium
MyleniumCorrect answer
Legend
March 11, 2021

You completely misunderstand. A Null is a non-rendering layer type to begin with and Write-On does not trace the layer motion. You need to apply the effect to a solid covering the entire comp and connect the effect's internal crosshair control with a pickwhip expression. In addition, however, you may need to use a layer space transform like toComp() and additional math to compensate for the positioning of the shape layer groups and the different coordinates used.

 

Mylenium

    D
    dose0D45Author
    Participating Frequently
    March 11, 2021

    Hmm, ok! Yes, the null was a shot in the dark, i just wanted to find something that would change the position-coordinates as it was moved around by the arm so i could control the position of the write-on with that. And pardon my french here, I am indeed learning by doing. But of course, the write-on needs a solid to write on, makes sense 🙂 I will dig abit deeper based on your suggestions, thanks.

     

    Terms & ConditionsAccessibility statement
    Using the community Terms of use Privacy Cookie preferences Do not sell or share my personal information ad choicesAdChoices