Idea Byre

Computer generated terrain usually begins with a base of random noise, or perhaps a fractal. These look nice in small sections, but are unconvincing for a continent: noise has none of the major features it should, like mountain ranges, and fractals are nothing but feature -- they're too regular. Here's a method for generating continent-level trerrain using distortion fields.

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1. Elaborations

Elaborations have indeed produced better results. Simply having water flow over a surface was not terribly hard to implement, but each sophistication -- even within the limits of a cell-based, time-step-based system -- have paid off. Initially, I tried having water flow according to the landscape alone, without recomputing where water was pooling; adding it in allowed much longer rivers to develop, as well as lakes (the lakes were all I expected to gain). Adding even a very crude momentum mechanism -- to prevent immediate back-flow when water is evening out over an area -- eliminated a strange checkerboard artifact.

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In this post I introduced my erosion-based model for building landscapes -- and promised details on how it works. Here's how.

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To many, the most perfect shape is the circle -- emblematic of unity -- or the square -- for combining with itself in a tile. But in the city Pherasa, the people have long held the spiral above all other forms. For them it is the basis of all aesthetics, and used in architecture, art, religion and war.

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While working on one of my space wargames, I became interested in historical ships, especially their classification and relative characteristics. (Were most classes small while only a few were large? Or was there some other distribution?) Trauling the Web I assembled some data.

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The systems of coinage used in the middle ages were more complex and more interesting than what's presented in most fantasy role-playing systems: if gold, silver and copper "pieces" with nice metric conversions seemed too neat to you, you were right; read on.

Metals

Silver English penny, 1...

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So you've laced your boots, strapped on your scabbard, and set your jaw. You're ready for some adventure. Where though will you go to find it? Where are the lonely places, where monsters, treasure and glory can be claimed? In this quest, you face some problems.

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What business do a man, an elf, and a dwarf have traipsing the countryside looking for quests? Where do they come from, and how do they fit into their society? Can they exist at all? I'll give a few answers to these questions below.

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The stock fantasy world of role-playing is, we usually think, basically like medieval Europe. There are castles, swords, peasants; various set pieces. But what do these worlds of abundant cash, swords for hire, open-minded villagers, and "mage guilds" really have to do with the middle ages?

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Here I present a surprisingly easy way to fill valleys in a rasterized elevation map, for the purpose of creating realistic rivers quickly.

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