Can't you just use the graph editor, and view the speed? I don't really see the need for expressions here... I would match the speed of the different lights using the graph editor and stretching/ squeezing key frames as required... Maybe I'm missing something.

Sent from my iPhone

On 23/05/2012, at 6:47 PM, David Torno <torno@sydefxink.com> wrote:

> Ok, maybe try this then...
>
> Create a text layer and add expression to the source text property. Pick whip over to the first light layer, then add ".speed". (explained in my tutorial here: http://provideocoalition.com/index.php/motiongraphicsvizfx/story/expression_shorts_-_trigger_event_based_on_layers_speed/)
>
> This will give you a visual speedometer in a sense. Make note of the speed, then switch expression to next light layer and adjust your keyframes until the speed matches, continue for remaining lights.
>
> Not an elegant solution, but will get the job done.
>
> David Torno
> Visual Effects Artist & Supervisor
> http://www.ghosttownmedia.com
> O: 213.739.2290
> C: 818.391.6060
> ---------------------
> http://www.sydefxink.com
> http://aeioweyou.blogspot.com
> http://mactex.blogspot.com
>
> "The most useless day is that in which we do not laugh"
> -Charles Field
>
> On May 23, 2012, at 12:44 AM, jarret langmeire <langmeire@gmail.com> wrote:
>
>> Hey guys,
>>
>> I've got a couple of lights acting as emitters travelling different distances but need each of them to travel at the same speed.
>
> +---End of message---+
> To unsubscribe send any message to <ae-list-off@media-motion.tv>
>

+---End of message---+
To unsubscribe send any message to <ae-list-off@media-motion.tv>