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# After Effects Random Number, but different each time

Posted on 2016-10-04
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I'm trying to create an expression for a slider control that will generate a random number between 1 and 8, but making sure the same number is not picked simultaneously two times in a row.

However, lastValue is always being read as 0.
Any idea what I am doing wrong?

holdTime = 0.1;
lastValue=thisLayer.effect("RandomNumber")("Slider").valueAtTime(time-holdTime)
seed = Math.floor(time/holdTime);
seedRandom(seed,true);
do
{
newValue=Math.round(random(1,8));
} while (newValue==lastValue)
newValue
0
Question by:stuartlandreth
• 3

LVL 29

Expert Comment

ID: 41829273
1 - I would think that valueattime is your problem
2 - your algorithm needs some revision: you do not need to reset seed each time, and in fact not sure what happens if you remove any seed call
0

Author Comment

ID: 41829632
Thanks for the comments. In the end, we dropped the random number generator and just used our own array of pre-defined "random" numbers where no two consecutive numbers were the same.
1

LVL 29

Accepted Solution

fibo earned 500 total points
ID: 41831310
This was indeed your best option.
In case your prefdefined array is hard coded, you might add a salt of random by choosing randomly at which part of the sequence you start initially (assuming of course that at the end of the arry you loop back to the beginning)
0

LVL 29

Expert Comment

ID: 41831750
B-) Glad to have contributed. Thx for the grade and the points!
0

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