[HELP] Globaldefines.xml Growth

[Allinuse]

In globaldefines.xml


<Row Name="BASE_CITY_GROWTH_THRESHOLD">
<Value>15</Value>
</Row>
<Row Name="CITY_GROWTH_MULTIPLIER">
<Value>8</Value>
</Row>
<Row Name="CITY_GROWTH_EXPONENT">
<Value>1.5</Value>
</Row>

From what I understand, 15 is the base food needed for a city to grow from 1 to 2, correct? How does it affect growth from size 2 to 3 and so on?

What does the multiplier 8 do and how would changing this in either direction affect growth?
I figure it cannot mean that from size 2 to 3 a city needs 15*8 food (120) and from 3 to 4 a city needs 15*120 (1800) because the numbers would get insane pretty fast.

City Growth exponent I have no idea what this might mean, which would slow down city growth, increasing or decreasing this?

 

[LeeS]

See this thread for how these are used in the calculation of the food needed for the next city-size: https://forums.civfanatics.com/threads/new-city-growth-formula.403114/

The CITY_GROWTH_EXPONENT is a mathematical exponent, which means the number of times to multiply a number times itself. so 2³ = 2 * 2 * 2 = 8. "3" is the exponent. For fractional exponents (ie, 1.5) the calculation is more complex and I cannot remember off the top of my head the rule to figure for example what 2^1.5 would result as.

 

[Allinuse]

Thanks, I would probably not have found that link if you hadn't posted

I set the values to this:

<Row Name="BASE_CITY_GROWTH_THRESHOLD">
<Value>22</Value>
</Row>
<Row Name="CITY_GROWTH_MULTIPLIER">
<Value>12</Value>
</Row>
<Row Name="CITY_GROWTH_EXPONENT">
<Value>1.6</Value>
</Row>

According to the calculations, growing now takes 45-46% more food at the first levels, then 43-44% until it starts taking 45-54% from 20 to 100 population.