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x and y expression
Hi,
I’ve been looking on the forum for an expression and the closest thing I could find are ones where the blur or opacity is affected by a layers z position.
I would like a layers opacity to be (example)100% when at the centre of the comp, and falloff as the layer nears the edges (moves around x and y) (a slider would be handy so the opacity near the edge could be modified, 25% or 0% etc).
A basic expression would be really helpful that could be modified and used for opacity or on a blur etc.
I was trying to set it up based on a toWorld(?) as it would be great if it was flexible to use in different sized projects.
(Also if z information is included that would be great too).Any suggestions would be appreciated.
Thanks
(Sorry if this has already been looked at in another post).
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4 Replies
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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);
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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. -
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);
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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
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