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Re: Change floor position in Bounce expression
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Adobe After Effects Expressions
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Re: Change floor position in Bounce expression
by
Dan Ebberts
on May 14, 2008 at 1:19:42 pm
Try this:
Vy0 = 200; //initial y velocity (pixels/second)
seedRandom(index,true);
Vx0 =random(-200,200); // initial x velocity (pixels/second)
g = 2500; // gravity (pixels/second/second)
floor = 1050;
e = .82; //elasticity
b = floor - position[1];
h = b + Vy0*Vy0/(2*g);
T = Vy0/g + Math.sqrt(2*h/g);
if (time < T){
y = Vy0*time - g*time*time/2 + b;
}else{
Vy = -(Vy0 - g*T);
Vy *= e;
t = time - T;
y = Vy*t - g*t*t/2;
}
[position[0] + Vx0*time, floor - y]
Dan
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Current Message Thread:
Change floor position in Bounce expression
by David Rodriguez on May 14, 2008 at 10:21:49 am
Re: Change floor position in Bounce expression
by Dan Ebberts on May 14, 2008 at 1:19:42 pm
Re: Change floor position in Bounce expression
by David Rodriguez on May 14, 2008 at 7:27:26 pm
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