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Change direction according to value
Hi
Long time user and fan of this Forum but first time posting. I have a problem and I’m hoping someone here can help me. What I am trying to achieve is this. I have a Null in the centre of my screen that is clamped to go 400 pixels to the right and left. I need this null to move an object 200 pixels to the left as it goes 200 pixels to the right and as the null goes from 200 to 400 pixels I need the object to move 200 pixels back to its original position. I was also wondering would it be possible to have it work in reverse as the null moves back to the centre of the screen. I guess something along the lines of the way a lens flare moves only as you approach the edge of the screen with the controller the flare moves back to the centre. I hope this is clear enough. Any help would be greatly appreciated!
All the best
Dan
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5 Replies
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Something like this maybe:
p = thisComp.layer("Null 1").position;
d = p[0] - thisComp.width/2;
if (d < 200)
value - [d,0]
else
value + [d - 400,0]
Dan
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Hi Dan. First off thanks so much for replying, I’m a big fan. This expression works great! I was trying to push it a little further by having the same motion happen again when the Null goes to the left of the centre but I cant figure out how to structure the if else statements. I’ll keep looking but if you had the time I would be grateful if you could cast some light on it.
All the best
Daniel
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Hi Dan
I figured out with the help of your expression how to get what I was looking for. The expression will probably make your eyes burn but here it is.
Many thanks
Daniel
p = thisComp.layer("Null 1").position;
d = p[0] - thisComp.width/2;
if (d>0 && d<200)
value + [d,0]
else if (d < 0 && d > -200)
value - [d,0]
else if ( d < -199 && d > -400)
value + [d - 400,0]+800
else if ( d > 199 && d < 400)
value - [d - 400,0]
else
value + [0,0] -
This should work:
p = thisComp.layer("Null 1").position;
d = p[0] - thisComp.width/2;
if (d < -200)
value + [d + 400,0]
else if (d < 200)
value - [d,0]
else
value + [d - 400,0]
Dan
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Hi Dan
I understand it now. I’ve been working on a rig for days and for some reason I was thinking comp width was 1080 instead of 1920 like a dope so i couldn’t understand the expression. I’ve got it perfectly now thanks a lot for your help. I modified it for a 6000 comp connected to a null for a faux 3d Rig body rotation. It works great!
All the best
Daniel
x = thisComp.layer("BODY_ROTATION").transform.position[0];
if(x>1340 && x<1400){
}else if(x>-68 && x<644){
}else if(x>-1430 && x<-768){
[100];
}else{ [0] ; }
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