Falling element stop a specific position

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i found expression here make object fall starting point simulating gravity:

 

seedrandom(index,true)

 

mgravbase=9.81; //basic gravity

mgravvar=random(-1,1); //gravity variation

 

maccel=time*(mgravbase+mgravvar);

 

x=value[0];

y=value[1]+math.pow(maccel,2);

 

 

[x,y]

 

but make object fall forever, how can set last position of animation , make stop?

animate hand. why bother expression?

 

mylenium



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