Controlling Rotation Speed

[Bhavesh Jadav]

I checked expression Dan.
the post expression graph looks like this

Well it work for on-ramp start then it stopped rotating.
I think the graph should look like the post expression speed graph on the motionscript.com.

The cyan colored graph.
PS : I changed the value of t1, t2, t3, t4
here’s the new value
t1=2
t2=3
t3=7
t4=8

[Bhavesh Jadav]

Hi Dan,

It really work well. I was misunderstood & confuse of that graph thing & sorry for that.
but only one issue that on on-ramp start & off-ramp start it rotates so fast compare to the speed in between on-ramp start & off-ramp start, but that is unnoticeable.
Thank you very much Dan.

[Ernestas Cepulionis]

Hi,

I studied math of this expression and I can’t find out why did you divided some values by 2?

…..
(t2 – t1)*spd/2
(t4 – t3)*spd/2;
(time – t3)*(v+spd)/2;
(time – t1)*v/2;
….

spd = effect("Slider Control")("Slider");
t1 = 0; // on-ramp start
t2 = 1; // on-ramp finish
t3 = 5; // off-ramp start
t4 = 6; // off-ramp finish

if (time > t4){
accum = (t2 - t1)*spd/2 + (t3 - t2)*spd + (t4 - t3)*spd/2;
}else if (time > t3){
v = linear(time,t3,t4,spd,0);
accum = (t2 - t1)*spd/2 + (t3 - t2)*spd + (time - t3)*(v+spd)/2;
}else if (time > t2){
accum = (t2 - t1)*spd/2 + (time - t2)*spd;
}else if (time > t1){
v = linear(time,t1,t2,0,spd);
accum = (time - t1)*v/2;
}else{
accum = 0;
}

value + accum