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Re: random points near central point

Cross-posted to 2 groups.

Followups directed to: comp.programming

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fir <profesor.fir@gmail.com> writes:

> sobota, 22 lipca 2023 o 21:24:23 UTC+2 Ed Prochak napisał(a):
>> On Friday, July 21, 2023 at 8:55:36 AM UTC-4, fir wrote: 
>> []
>> > no i dont want to put an asteroid in 'cylinder' from radius r1 to r2 
>> > i want to set most of them in circle r1 and rest in cylinder from r1 to r2 
>> > such way it would look naturally such as a n group of astronomical things 
>> > or pieces of things when you shatter them on the floor - most density in 
>> > the centre till r1 less near r2 and none outside r2 
>> >
>> I suggest you define your expected distribution first. 
>> You might begin by defining the distribution you really want. 
>> case 1: Is it constant density from 0 to r1 and then linear decline of density from r` to r2? 
>> case 2: is is a natural distribution of "astronomical things"? 
>> (clearly not like case 1, consider the solar system, including the asteroid belt) 
>> case 3: is it a random scattering as "when you shatter them on the floor" 
>> (clearly not like case 1 or 2. This is a gaussian distribution.) 
>> case 4: SOMETHING ELSE??? 
>> 
>> State your desire clearly and we may be able to help you. Without a clear goal, 
>> you'll be debugging potential solutions forever. 
>> 
>> Ed
>
> i dont care to much exactly i need to set a pack of 200 asteroids
> around some point to look good (but this should be not to much density
> in centre, ilke 10 asteroid cover the same piece of screen, thety may
> cover partially, but not like stack in 10 in one place)...also i want
> to use this function to set other things like in random group (but not
> like brush in pain, its more like more density in centre (where centre
> is not point but circle) and gradually less from r1 to r2

A bit like these:

http://bsb.me.uk/tmp/r1.png
http://bsb.me.uk/tmp/r2.png

> i think its not hard to understand what i want

It's hard to understand what you write.  I am sure what you want is
quite simple.  This is not about C so I'm going to crosspost to
comp.programming and set followups.  I won't post about it here again.

-- 
Ben.

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Re: random points near central point Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-07-23 14:53 +0100
  Re: random points near central point Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-07-23 15:25 +0100
    Re: random points near central point Richard Harnden <richard.nospam@gmail.com> - 2023-07-23 17:46 +0100
      Re: random points near central point Ben Bacarisse <ben.usenet@bsb.me.uk> - 2023-07-23 21:04 +0100
  Re: random points near central point Y <yyyyyyyyyayayayyyyyaaaaaa@hotmail.com> - 2023-07-23 09:04 -0700

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