Random grey scale point color wrangle

[loucifer]

Silly question, but total wrangle noob here...

I want to set random grey scale values on points, not sure if I should be using @id or @ptnum and how the expression would look?

 

TIA

[Sean-R]

This should work:

@Cd = rand(@ptnum);

The rand() with one input will give you a float value between 0 and 1, as Cd is a vector attribute the value will be copied over three times

[loucifer]

Thanks, how would I control the values, say I don't want it to go pure black or white?

[Sean-R]

You can wrap the rand() in a fit function or a fit01 function. The fit01 clamps the input values to 0 and 1:

 

fit01(rand(@ptnum), min value, max value)

[Yon]

ill build off seans line

 

@Cd = rand(@ptnum); // randomize color
@Cd = @Cd.x; // make greyscale
@Cd = clamp(@Cd,.25,.75); // clamp to min and max

where .25 is your min
and .75 is your max

edit: lol post in the same minute

Edited October 17, 2017 by Yon

[loucifer]

Thanks guys, much appreciated!