Message-ID: <52141552.3090009@gmail.com>
Date: Tue, 20 Aug 2013 21:18:10 -0400
From: Bruce Wainer <brwainer@gmail.com>
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To: After Effects Mail List <ae-list@media-motion.tv>
Subject: Re: [AE] Fading a light beyond a certain angle
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This should work (may not be 100% correct syntax):

x=value; //current angle value, in 0-infinity
y=x/360; //how many rotations; equal to radians/2
z=Math.floor(y); //number of completed rotations
x-z*360 //current angle in 0-360

Bruce

On Tuesday, August 20, 2013 8:58:45 PM, Alex Czetwertynski wrote:
> Hello
>
> I'm trying to figure out an expression to control the brightness of a rotating light.
> My light is turning on itself, on the Y axis.  Everytime it passes 90 degrees, rotating away from the camera, I'd like to reduce its intensity, and then bring it back when it is starting to enter the quadrant in which it will face the camera.
>
> If the camera was just rotating once, I'd use a linear expression that mapped 180 to 270 degrees and faded the light in between those two values, but it is constantly looping…
> I thought I might be able to use Radians, but they, obviously, keep increasing with the degrees…
>
> Any suggestions?
>
> Thanks!
> Alex
>
>
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