border expansion

Does any one know what the exact border growth function implementation is? I can't find it in the game files but some simple tests have revealed some oddities related to GAME_SPEED / the PlotCultureCostModifier. Here's some values I've pulled from the latest version on turn 1. These are turns...

For this video at this starting time (28:28): Why did the border expand for this city in the north? The player hasn't reached 15/15 culture yet, but has this extra tile suddenly nevertheless. The player (teaching us noobs how to play) didn't mention this nifty little part. Edit: nor did he...

I've been trying to make a mod to increase max border distance, border growth rate, and population growth rate. I tried almost every mod I could find to increase the max border distance and none of them have worked, the only thing I haven't tried is changing the actual globaldefines.xml in the...

Civ4 Tile Culture Over Coast by madwheel posted Oct 4, 2019 at 3:07 PM In my image, the city Ayodhya is not adding tile culture to tiles between the purple and black lines, even though the city is clearly a 500 lvl city (so it definitely would be if it were all land). I assume it must only be...

So i was thinking right why doesn't different civs have different expansion rates to different tiles like if i was an Aztec id want to expand to a rain forest than a desert something like that so why don't they add in a mechanic that reduces culture cost to expand to that tile like Egypt would...