How to Rig a Lens Flare in After Effects

Learn how to rig a dynamic lens flare using native plugin's and effects in After Effects. The expressions used in the video can be found below. 

Negative X

mlt = 2;
dist = (mlt+1)*(width/2);
FP = thisComp.layer("Flare Position").transform.xPosition*-1;
EQ = (dist+FP)/mlt


Negative Y

mlt = 2;
dist = (mlt+1)*(height/2);
FP = thisComp.layer("Flare Position").transform.yPosition*-1;
EQ = (dist+FP)/mlt


Positive X

mlt = 1.5;
(width/2)+(thisComp.layer("Flare Position").transform.xPosition/mlt)­-(width/(mlt*2))


Positive Y

mlt = 1.5;
(height/2)+(thisComp.layer("Flare Position").transform.yPosition/mlt)­-(height/(mlt*2))


Also if you would like to download the project file here is a link:

http://bit.ly/1DYN3LT