multiple expressions on one track over time – How?

[Filip Vandueren]

you can use if/else statements to switch between different expressions,
trigger them by handcoding time,
or by referencing to a slider that you can keyframe 1,2,3.
or even using markers on the layer, whatever.

like this:


if (time<10) {
// expression 1, will be calculated from 0-10 seconds
} else if (time<15) {
// expression 2 will be calculated from 10-15 seconds
} else {
// exression 3 will be calculated after 15 seconds
}


or


temp = effect("Slider Control")("Slider");
temp=Math.floor(temp.Value); // round of the values so we don't have problems with inbetween integer values

switch temp {
case 0:
// expression 1
case 1:
// expression 2
case 2:
// expression 3
default:
// default expression
}


I used the switch syntax for fun here, it's a different way of testing one value against a set of possibilities.

[Dan Ebberts]

Using switch is a cool way to do it. You could combine that with code to get the index of the most recent marker, then you could set it up so that you just need to drop a layer marker wherever you wanted the next expression to start.

n = 0;
if (marker.numKeys > 0){
n = marker.nearestKey(time).index;
if (marker.key(n).time > time){
n–;
}
}

switch (n) {
case 1:
// expression 1
break;
case 2:
// expression 2
break;
case 3:
// expression 3
break;
default:
// default expression (no markers or more than 3)
}

Dan

[Xfrf.ru]

Thank You Filip!
This helps. I did not realise expressions can be more than one line constructions with branching! )

[Mike Clasby]

I like all three methods, although the Marker solution is very handy for me..

Thanks for all.

[Xfrf.ru]

Dan, thank you for the advanced solution!