Null changing opacity with falloff

[Othman Ahmed]

// This might help you.

nullPointer = thisComp.layer(“your null name”).transform.position;

thisPsotion = transform.position;

// add a slider effect to the null.

falloff = thisComp.layer(“your null name”).effect(“Slider Control”)(“Slider”);

l = length(nullPointer,thisPsotion);

i = linear(l,0,falloff,100,0)

// just change the value of the slider control to get the result you looking for.

[Gus Favoreto]

Thanks, Othman.

But when I change the slider value, the opacity turn 0, even if it is 0,1

[Othman Ahmed]

Did you paste the expression to the all block’s opacity property?

[Gus Favoreto]

Cool, did work. But it has fade on both sides. I would like to have just the tail.

But worked well.