I have this expression.
thisComp.layer("Black Solid 3").effect("Particular")("Position XY")
Its is simplely a lens flare (cc lens flare) following the position of a particle (particular).
Particular's emmitter type is box and the actual particle lags behind about 20px.
I do not want to keyframe because of the amount of key points and the speed of movement.
Can i add something to the pick-whipped expression that would allow me to offset the position to be slightly behing TCpaticulars position? -- (if that makes sense)
BTW, is there a better flare than cc particle in TC?
You need to add a value at time method to your expression. This will allow you to add or subtract the value of any property at the current time measured in seconds. For example if I had layer 1 and layer 2 this expression applied to layer 2's position property would make layer 2 follow layer 1 by .5 seconds.
thisComp.layer("layer 1").position.valueAtTime(time - .5)
By the way this expression is referenced right in the Expression Language section of the help file. It's on the first page.