User parameter: random

[nkloski]

Hi all....I knwo that one can enter in mathematical formulas into various places in Fusion 360.

Is there a "random" value I can put in/use to create some organic randomness?

Thanks!

[martin.zatecka · Accepted solution]

Hello,

I'm not aware of any random variable. However it is interesting idea. I would like to have the "random" variable oscillates in defined range of min and max.

please put your idea to http://forums.autodesk.com/t5/fusion-360-ideastation-request-a/idb-p/125

regards

Martin

[nkloski]

Done! Thanks!

http://forums.autodesk.com/t5/fusion-360-ideastation-request-a/please-add-in-quot-random-quot-number...

[HughesTooling · Accepted solution]

There is a random() Function available. Click on learning at the top of the screen, then form + modify panel  + change parameters for a list of functions.

Mark.

[HughesTooling]

Ok just tried to use the random function and it makes Fusion crash. I set up a user parameter and random seems to give a random number between 0 and 1 but if you try and use it as a dimension eg. set up a parameter test using random() the in dimension use test*10 fusion crashes.

Mark.

[martin.zatecka]

Hello Mark,

thank you for your comment. My mistake, I missed the information about random() variable.

Please would you help me to reproduce the crash of Fusion?

I setup this example without any followed crash.

thank you

Martin

[HughesTooling]

Hello Martin

I tried to enter the equation directly into a dimension. Example draw a line, select dimension tool, pick line and type test*10.

Mark

[martin.zatecka]

nice catch 🙂 I'll ask for fix.

thank you

Martin

[nkloski]

Thanks! Yes, that does return a random number...is there a way to get it to (as suggested by you, Martin) oscillate between a certain range?...or just to return a number like "42" or "75"?

I tried using the "round" variable, but that did not seem to get the right response, it only returned numbers that were divisible by 10 (20, or 90, or 70).

[martin.zatecka]

Hello,

Let's try this:

random() returns numbers from 0 to 1

set maximal and minimal value, the formula "( random() * ( maxRange - minRange ) ) + minRange" calculates value in range of min and max.

for example: 

random = 0, min = 10, max = 20

formula: 0 * (20 - 10) + 10 = 10

random = 1, min = 10, max = 20

formula: 1 * (20 - 10) + 10 = 20

Do you want to adjust it, or it is ok?

regards

Martin

[jeff.pek]

Hi -

Typically, this would be done by multiplying the random number by the difference between the min and max values, and adding the min value. This sample is from a different language, but clarifies the approach:

// Returns a random integer between min and max
// Using Math.round() will give you a non-uniform distribution!
function getRandomInt(min, max) {
  return Math.floor(Math.random() * (max - min + 1)) + min;
}

Hopefully we support the floor() function!

 Jeff

[HughesTooling]

---

@nkloski wrote:

I tried using the "round" variable, but that did not seem to get the right response, it only returned numbers that were divisible by 10 (20, or 90, or 70).

---

I just trird round and it seems to work ok.

Mark.

[nkloski]

Awesome!  Thanks, all!

[joeX8245]

Was this ever solved?

There are times where having  a randomly generated number that varies (in a range) when applied to a pattern for example would be very useful.

My goal is to have radii extend from a center point in random intervals between 15 and 25 deg.

I tried using: ( ( random() * ( ceil(25) - floor(15) ) ) * 1 deg ) + ( floor(15) ) * 1 deg

The formula compiled, but when I inserted it into the patterning tool, I got one value repeated. 

Could we add 'noise' as a variable?

I can imagine with some rounding and constraints, that could would provide a sample 'set'.

Is there a way to do this in Python or Java?