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Coding to randomly rotate a cube on z axis
I am trying to make the rotation on a cube random, but so that it stops on a face for a random (or fixed) amount of time then randomly spins around and stops on another face.
My coding below makes it rotate randomly, but I have no idea how to make it stop on a face.
segDur = 3;
seed = Math.floor(time/segDur);
segStart = seed*segDur;
seedRandom(seed,true);
startVal = random(360+transform.zRotation);
seedRandom(seed+1,true);
endVal = random(360+transform.zRotation);
linear(time,segStart,segStart + segDur, startVal, endVal);I did try to do an if loop so that a variable is returned from the rotation value at a specific frame, and when that variable is equal to 90, 180 etc, then a posterizeTime expression is done for a random/fixed about of time, but I didn’t get very far, because I have no idea how to!
Is there any chance that someone had tried this sort of thing before and can give me some pointers on the code. I have a little coding experience, but hardly any in JavaScript.
Also, does anyone know of an AE specific JavaScript book that I can get hold of to make scripting a bit easier?
Many thanks,
Victoria -
3 Replies
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Maybe create a posterized random value that is always at 90-degree angles. Then apply a smooth function to that value, averaging an amount of time that you want it to take to turn to a new side.
I can get into more details later.
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Try his expression for z-rotation:
//Begin expression
segMin = .3; //minimum segment duration
segMax = .7; //maximum segment duration
//–
list = [0, 90, 180, 360];
minVal = 0;
maxVal = 3;
//–
end = 0;
j = 0;
while ( time >= end){
j += 1;
seedRandom(j,true);
start = end;
end += random(segMin,segMax);
}
endVal = list[Math.round( random(minVal,maxVal))];
seedRandom(j-1,true);
dummy=random(); //this is a throw-away value
startVal = list[ Math.round(random(minVal,maxVal))];
ease(time,start,end,startVal,endVal)
//–end expressionI just took a sample from Dan’s site, http://www.motionscript.com and modified it a bit. And as for your question asking wheteher there are any books on javascript for AE, the answer is no. (Well at least not until someone can convince Dan Ebberts to write one) If you want some websites to learn expressions/scripting from just search the archives and you can find some links.
~Colin~Colin Braley
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Superb! That is exactly what I needed. Thank you so much!!
Victoria
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