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Random Scale Up (for multiple objects)
hi,
i need to write an expression that will scale up an object (to 21% in this case) at a random time between 2 and 5 seconds. (so i can use it many times)
the expression below does that but it keeps moving the scale after it’s reached 21% but i want it to stop when it’s reached it’s max scale.
how do i do this?
thanks for you’re help.
max_scale=21; //maximum scale
smax=5; //scale ramp-up time
smin=2;
s=random(smin,smax);life=effect(“life”).param(“Point”)[1];
age=time-effect(“life”).param(“Point”)[0]; //age=time-birth
if (age(that might be quite messy code?!)
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3 Replies
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oh yeah…
effect(“life”).param(“Point”)[1]
relates the effect “point control” that has been renamed “Life” that has it’s own expression (that generate two numbers… x=0 and y=between 1.5 & 3) that also powers some other expressions as well as scale.
thanks… any help would be fantastic!
sorry if that’s not very clear… i’m quite new to expressions
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[Simon Roberts] “max_scale=21; //maximum scale
smax=5; //scale ramp-up time
smin=2;
s=random(smin, smax);life=effect(“life”).param(“Point”)[1];
age=time-effect(“life”).param(“Point”)[0]; //age=time-birth
if (age
x=(age/s)*max_scale;
[x,x,100]
}else{
[max_scale,max_scale,max_scale]
} “If that is exactly the way your code is entered, your if() statement isn’t doing anything. Also, your random ‘s’ value is re-evaluating at every frame, so you may want to seed a ‘timeless’ random.
Try this instead:
max_scale=21; //maximum scale
smax=5; //scale ramp-up time
smin=2;
seedRandom(index, true);
s=random(smin,smax);life=effect("life").param("Point")[1];
age=time-effect("life").param("Point")[0]; //age=time-birthx = linear(age, 0, s, 0, max_scale); //If 'age' is ever greater than or equal to 's' then 'max_scale' will be returned thanks to the magic of the linear() function!
[x,x,x];
Emphasis is added where I changed your code.
Darby Edelen
Lead Designer
Left Coast Digital
Santa Cruz, CA -
thats brilliant… it works just as i wanted. it’s funny how you can try and work stuff out for hours and then someone who knows about these things comes along and can write the code in a few seconds.
thanks again
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