Random selection

[Alex]

Hi,

is there any chances to add a command for the future: random selection (with option to pick what % to be randomly selected from the whole scene). That would be really useful for artistic/design work. Thank you as always!!

[martinsiegrist]

This could be scripted.

import random
import math

import rhinoscriptsyntax as rs


a=rs.GetObjects(message="Select")

b = len(a)

c = rs.GetInteger("percentage")

percentage = int(math.ceil(b/100*c))

rs.SelectObjects(random.sample(a, percentage))

[Alex]

thank you Martin, I will try it out

[jdelavaulx]

Hi Martin,

Thanks heaps for the script; I use it a lot.

Is it possible to have a similar script; where instead of inputting a percentage, you can input a number of objects you want to select?

Best,
Jeremy

[martinsiegrist]

I think the sample function requires a number and the percentage input is converted into a number first.

That means you can replace the percentage input with just a number input.

[jdelavaulx]

Hi Martin, thanks for your reply,

When the script asks for a percentage, when you input a number (e.g., 45), it gives you 45% of the total number of objects. How do you put 45 as a number of objects you want selected?

Best,
Jeremy

[martinsiegrist]

I think this should do it:

import random
import math

import rhinoscriptsyntax as rs


a=rs.GetObjects(message="Select")

c = rs.GetInteger("number")

rs.SelectObjects(random.sample(a, c))

[jdelavaulx]

@martinsiegrist

import random
import math

import rhinoscriptsyntax as rs


a=rs.GetObjects(message="Select")

c = rs.GetInteger("number")

rs.SelectObjects(random.sample(a, c))

Works perfectly :))

Thank you so much

-Jeremy

[David85 (David)]

Hi there,
Please forgive my ignorance, this is my first time using scripts.
I have a few hundred blocks on the screen and want to select some randomly. I’ve tried running this script and this is what I get.

Many thanks in advance for any help that you can give!

[martinsiegrist]

What Rhino version are you using?

Here in Rhino 8 windows the script worked. When you run the script, you’re asked to select…

Please select the whole set from which you want to get a random selection. Then enter a number which needs to be smaller than the total number of objects in the set.

[David85 (David)]

@martinsiegrist

import random
import math

import rhinoscriptsyntax as rs


a=rs.GetObjects(message="Select")

b = len(a)

c = rs.GetInteger("percentage")

percentage = int(math.ceil(b/100*c))

rs.SelectObjects(random.sample(a, percentage))

Thanks for getting back! I’m using Rhino 7. I have selected all the items and still get an error message. Where abouts in the script do I add the number of items? I’ve currently got 12,000ish blocks (roof tiles) selected and want to select about 1000 at random each time.

[martinsiegrist]

This should be a python script and not *.rvb

[David85 (David)]

@martinsiegrist

import random
import math

import rhinoscriptsyntax as rs


a=rs.GetObjects(message="Select")

b = len(a)

c = rs.GetInteger("percentage")

percentage = int(math.ceil(b/100*c))

rs.SelectObjects(random.sample(a, percentage))

It all makes sense now! I didn’t know about python scripts. Thank you so much.