How grow a garden random fruit size system works

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1

Hello everyone, for my game i would like to implement random size system similar to grow a garden’s
but I couldnt figure out how do they gradually make higher size have a lower chance of spawning and how sprinklers affect its size aswell? I would like to see few examples and some explaining, tysm in advance

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2

weighted chance system.
Althrough they use something more easier like math.log probably

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3

yeh i use it myself but ive only used it for item tables ect. and i have no idea how would i apply it to this, could you give me an example

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:seedling: Goal: Random size, large sizes rarer

Let’s say size can go from 1 to 100.

:white_check_mark: Basic Version (log-based rarity)

function getRandomSize(minSize, maxSize)
	
minSize = minSize or 1
	
maxSize = maxSize or 100

local r = math.random() -- Random float from 0 to 1
	
local scale = math.log(maxSize + 1) -- +1 to avoid log(0)
	
local size = math.floor(math.exp(r * scale)) - 1

return math.clamp(size, minSize, maxSize)

end

:brain: Explanation:

  • r is a random float between 0 and 1.
  • math.exp(r * log(max + 1)) biases the result toward small values.
  • math.floor(...)-1 adjusts the scale so size ranges from 0 to maxSize.

:sweat_drops: Adding Sprinklers: Boost the Size

Let’s say each sprinkler gives a small bonus chance to grow bigger.

:wrench: Option 1: Bias r upward with sprinklers

function getRandomSizeWithSprinklers(minSize, maxSize, sprinklerLevel)
	
minSize = minSize or 1
	
maxSize = maxSize or 100

local r = math.random()
	
-- Apply a bias by raising r to a power < 1 (pushes r higher)
	
local bias = 1 / (1 + 0.1 * sprinklerLevel)
	
local biasedR = math.pow(r, bias)

local scale = math.log(maxSize + 1)

local size = math.floor(math.exp(biasedR * scale)) - 1

return math.clamp(size, minSize, maxSize)

end

:test_tube: How this works:

  • No sprinklers → bias = 1 → no effect.
  • More sprinklers → smaller bias exponent → r moves closer to 1 → higher sizes more likely.
Sprinkler Level Bias Exponent Result
0 1 Normal
5 ~0.666 Higher sizes more often
10 ~0.5 Big boost to size chance

:blossom: Summary

You now have a logarithmic-based size system in Roblox:

  • math.exp(math.random() * math.log(max + 1)) → biased toward small sizes.
  • Add sprinkler influence by adjusting the randomness curve via exponent.
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