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Activity Forums Adobe After Effects Link layer’s position properties to another layer without shifting its place???

  • Link layer’s position properties to another layer without shifting its place???

    Posted by Everton Gois on January 27, 2016 at 2:21 pm

    Hi Everyone, I’m trying to create an automatic follow thru using two nulls, the problem I’m facing is, when I link ‘Null1’ XY position to ‘Nulls2’ XY position, ‘Null1’ shift its place to ‘Nulls2’. How can I keep ‘Null1’ at the same position as it was?. Its a character rig, I’m link ‘Head’ to ‘Hip’, so as the ‘hip’ moves up/down, ‘Head’ will be 3 frames delayed its moviment.Another thing is ‘Head’ is parented to the ‘Neck’ layer.

    I’m using this expression to to create auto ‘follow thru’:
    thisComp.layer(“Bla Bla”).transform.position.valueAtTime(time-(3/25));

    Thank you for your time

    Everton Gois
    Digital Artist

    Everton Gois replied 10 years, 3 months ago 2 Members · 4 Replies
  • 4 Replies
  • Mike Sevigny

    January 27, 2016 at 3:20 pm

    You can add ‘+value’ to the expression. It’ll allow you to move the layer where you want it while still having it follow ‘Bla Bla’. You can also independently animate it using it’s own keyframes

    (thisComp.layer(“Bla Bla”).transform.position.valueAtTime(time-(3/25)))+value

    You can also add yourself a Position Expression Control from the Effects and add its value if the above is impossible for your current setup.

    Mike Sevigny
    https://www.torusfx.com

  • Everton Gois

    January 27, 2016 at 3:42 pm

    OMG Mike, it worked as treat!. Thanks for that.
    I’m interested in what you said here
    “You can also add yourself a Position Expression Control from the Effects and add its value if the above …”
    I’m totally beginner when it comes to expression, if you could give a hint how to do it I’d apreciate once again.

    Everton Gois
    Digital Artist

  • Mike Sevigny

    January 27, 2016 at 4:17 pm

    After Effects allows you to add additional parameters to use with your expressions. Under ‘Effect’ at the top of the application, select ‘Expression Controls‘ > ‘Point Control‘. This will give you additional parameters to link or keyframe.

    So in the case above, you could add the new ‘Point Control’ to your expression instead of the +value. Have a look at the other options in the ‘Expression Controls’ menu. Note that you can also rename the parameters by selecting the name in your ‘Effect Controls’ panel and hitting [ENTER], like you would in your ‘Project Panel’.

    Good luck!

    Mike Sevigny
    https://www.torusfx.com

  • Everton Gois

    January 27, 2016 at 4:20 pm

    Mike, you are a STAR. Thanks for this little BIG HELP. I appreciate 🙂

    Everton Gois
    Digital Artist

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