Message-ID: <E959958A14D5430DBB6125CEA72A56DB@HPZ200>
From: "Dan Ebberts" <debberts@comcast.net>
To: "After Effects Mail List" <AE-List@media-motion.tv>
References: <list-5181730@media-motion.tv>
In-Reply-To: <list-5181730@media-motion.tv>
Subject: Re: [AE] Fading a light beyond a certain angle
Date: Tue, 20 Aug 2013 19:32:11 -0700
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I probably have the ranges all wrong, but you should be able to adapt 
something like this:

a = transform.yRotation%360;
if (a < 180)
  ease(a,90,180,100,10)
else
  ease(a,180,270,10,100)


Dan

-----Original Message----- 
From: Alex Czetwertynski
Sent: Tuesday, August 20, 2013 5:58 PM
To: After Effects Mail List
Subject: [AE] Fading a light beyond a certain angle

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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