x and y expression

[Mike Clasby]

This seems to do what you want. Put a slider on a New Null (to adjust the distance that the layers opacity reacts too like you asked for). Put the expression on the layer’s opacity:

d = thisComp.layer(“Null 1”).effect(“Slider Control”)(“Slider”);

point1=this_layer.position;

x = this_comp.width/2;
y = this_comp.height/2;
point2=[x,y];

delta=sub(point1, point2);// Find the vector between them
distance=length(delta);// Now find the length
linear(distance, d, 0, 0, 100);

It’s a hack from Dan’s stuff.

If you want an ease on the interpolation change the last line to:

easeIn(distance, d, 0, 0, 100);

or

easeOut(distance, d, 0, 0, 100);

[Jack Parks]

Hi,
Thanks for your help I really appreciate it.
Sorry but I think I am getting something wrong though, the expression seems to have no effect.

I set up a new comp for a test, with Null 1 and a slider, and a white solid with the expression on opacity.
I keyframed the white solid to move from top left corner to bottom right corner.
The solid doesn’t seem to change opacity, moving the slider results in 0% or 100%.
[The effect I had hoped for was increasing opacity nearer the centre]

Sorry I think I must have missed something even though it’s so simple.

Any tips would be great.
Thanks again.

[Mike Clasby]

d = thisComp.layer("Null 1").effect("Slider Control")("Slider"); 

point1=this_layer.position; 

x = this_comp.width/2; 
y = this_comp.height/2; 
point2=[x,y]; 

delta=sub(point1, point2);// Find the vector between them 
distance=length(delta);// Now find the length 
linear(distance, d, 0, 100, 0); 

The correct code is above it works for me as avertised (as setup in my first post), but the original code I gave you did the opposite, it fades out as it approaches the center, here’s the correct last line:

linear(distance, d, 0, 100, 0);

[Jack Parks]

Hi,

Thanks for your patience, you’re right it does work, I hadn’t got the slider at a high enough value. Sorry my bad.
It’s great thanks for your help.

Cheers