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electricpalmtrees
electricpalmtrees
Known Participant
Jan 12, 2025 12:14 AM UTC
Question

Expression >> Attract a layer to a null object (pos) >> Adding a slider

Hi all,

This is the attract layer to null object position  expression

thisComp.layer("YourNullObjectName").position;

 

The trouble is when added it's an instant snap to the destination null object. Is there anexpression i can add or alter this, so i can highlight a number / strong of the attractor and then expression pick whip this to a slider control? Much in the same way we do to the wiggle expression to use velocity to turn it on and off.

 

I'm looking to be able to use a 0 to 100% method with keyframes on a slider controller. So i can then add velocity and really chosen how to craft the animation to suit.

 

Over to you good people:)

Graham

 

 

3 replies

Mylenium
Mylenium
Legend
Jan 12, 2025 8:22 AM UTC

Could be as simple as this:

 

aRef=thisComp.layer("Attractor");
aPos=aRef.transform.position;
aForce=aRef.effect("Whatever")(Slider);

sPos=thisLayer.transform.position;

X=linear(aForce,0,100,sPos[0],aPos[0]);
Y=linear(aForce,0,100,sPos[1],aPos[1]);

[X,Y]

 

Mylenium

 

 

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electricpalmtrees
electricpalmtreesAuthor
Known Participant
Jan 12, 2025 11:01 AM UTC

cool Mylenium

couple of things i'm in 3D space so could you edit for x,y,z please.

 

also and fogive my lack of knowing please, what do i add into the "whatever" is that pick whipped to the slider i choose to use? example if my slider is called object_1138 then that line should be:

aForce=aRef.effect(object_1138) (Slider); correct?

 

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electricpalmtrees
electricpalmtreesAuthor
Known Participant
Jan 12, 2025 1:29 AM UTC

recent to the above i have worked out that i can add an expression to a layer object and then use 2 nulls to move using a slider. this one..

linear(pick-whip-slider-value-here, 0, 100, pick-whip-null-1-position-here, pick-whip-null-2-position-here)

 

the thing is i have hundreds of objects already, so i’m trying to work out if i can get the slider setup into this starting point ( “thisComp.layer(“YourNullObjectName”).position;” ) , so i’d only have the object layer and 1 null, which would be better and more manageable.

 

love to hear your views and feedback please

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