[Filip Vandueren]

Thanks Dan,

didn’t test the expression… d’oh

This will work:

beginValue=3;
beginTime=5;
incTime=2;
inc=6;

beginValue + Math.floor((time>beginTime?time-beginTime:0)/incTime)*inc;


[Filip Vandueren]

Thanks Dan,

didn’t test the expression… d’oh

This will work:

beginValue=3;
beginTime=5;
incTime=2;
inc=6;

beginValue + Math.floor((time>beginTime?time-beginTime:0)/incTime)*inc;


[Filip Vandueren]


posterizeTime(3); // in fps
random(100)>50 ? 100 : 0;


If you preceed any expression with a “posterizeTime”, you will limit how many times per second the value is updated.
The second line is shorthand for:

if a random number from 0-100 > 50, then opacity=100 else opacity=0

If you need to, you can pickwhip the value inbetween the brackets of posterizeTime to an expression control slider.
That way you can alter the framerate dynamically.
But it would be best to use Hold keyframes on the value of that slider to jump from say 3fps to 2 fps, because the it will not interpolate intuitively.

[Filip Vandueren]


posterizeTime(3); // in fps
random(100)>50 ? 100 : 0;


If you preceed any expression with a “posterizeTime”, you will limit how many times per second the value is updated.
The second line is shorthand for:

if a random number from 0-100 > 50, then opacity=100 else opacity=0

If you need to, you can pickwhip the value inbetween the brackets of posterizeTime to an expression control slider.
That way you can alter the framerate dynamically.
But it would be best to use Hold keyframes on the value of that slider to jump from say 3fps to 2 fps, because the it will not interpolate intuitively.

[Filip Vandueren]

That would be:


startValue=3;
startTime=0;
incTime=2;
inc=6;

startValue + Math.floor((time>startTime?time-startTime:0)/incTime)*inc;


startTime would be if you want the counting to begin later.

[Filip Vandueren]

That would be:


startValue=3;
startTime=0;
incTime=2;
inc=6;

startValue + Math.floor((time>startTime?time-startTime:0)/incTime)*inc;


startTime would be if you want the counting to begin later.

[Filip Vandueren]

Math.floor(time/2)*6;

or:


startTime=0;
incTime=2;
inc=6;

Math.floor((time>startTime?time-startTime:0)/incTime)*inc;


[Filip Vandueren]

Math.floor(time/2)*6;

or:


startTime=0;
incTime=2;
inc=6;

Math.floor((time>startTime?time-startTime:0)/incTime)*inc;


[Filip Vandueren]

I get that message sometimes, usually when running low on Ram or with very many layers.
Purging, or closing and re-opening the file fixes it.

[Filip Vandueren]

The problem is that if your ‘locomotive’ stops; all the layers would come crashing into it. 🙁

The easiest solution that springs to mind would be to precompose all your layers using the ‘follow the leader expression’, do the motion of the loco in constant speed, that way all the wagons will keep the right distance from each other.
Then use time-remapping on the pre-comp for slowing down, reversing, stopping etc.

But perhaps there’s still a more logical approach that would let you just animate the loco-layer.