mirror of
git://repo.or.cz/rocks.git
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111 lines
3.4 KiB
Plaintext
111 lines
3.4 KiB
Plaintext
Geological layer generator for [Minetest] "rocks"
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=============
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Aim of this mod is to replace all generic stone (default:stone) and
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generate underground layers of different rocks.
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Currently everithing generated above ground, in air. This is for debugging.
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Features
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--------
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* layers of different rocks: sort of working
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* ore veins: nothing
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* extensibility, api: ok
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** Work in progress! **
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* Git clone: [https](https://gitorious.org/mt/rocks.git)
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Screenshots
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-----------
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* Layers: 
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* Coal pane: 
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* Vein: 
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Documentation
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-------------
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How the underground is generated: *todo*.
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Underground is divided into horizontal layers. Bottom of each layer is at
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fixed height and moved up or down by 2d perlin noise.
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In every layer there can be multiple veins. Veins are blob-shaped volumes
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of different rocks. Borders of vein are defined by 3d perlin noise. Veins
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often contain ores.
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In every vein, ores are distributed randomly. Some ores
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may occur in specific areas of the vein (where noise is higher than
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treshold) or distributed randomly in specific amount (chance based on
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pseudorandom number) or combination of both.
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There is 1 2d perlin noise per layer, 1 3d perlin noise per vein and 1
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pseudorandom number generator per ore.
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Modding Interface
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-----------------
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"Rocks" exposes api to add new ores, veins and layers. The api is defined
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in [register](register.lua).
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### Register layer
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rocks.register_layer=function(name,params,rock)
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This function registers a layer. Layer is identified by unique string name.
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Location of layer is specified in params and node, the layer should be
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composed of is defined by rock.
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Field "params.gain" sets how height of the layer should vary. Field
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"params.height" sets height of bottom of the layer. Field "params.limit" is
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value of noise above which the layer is not generated. Set to 2 to disable
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this feature. Last field "params.seed" is offset to world seed to seed the
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noise.
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### Register vein
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rocks.register_vein=function(name,params)
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This function registers a vein with name "name" to be generated according
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to params.
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Field "params.spread" {x,y,z} defines how the vein should look like. X
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shoudd be equal to z. If y=x=z then the vein is equal in all directions. To
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make the vein taller, set y to higher value. Larger values make larger and
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less frequent veins.
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Field "params.treshold" specifies rarity of the vein. It should be betveen
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-2 and +2, mapgen will use this or per-ore treshold if per-ore treshold is
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larger.
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- 2 never generate
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- 1 extremly rare
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- 0 50% chance
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- less than 0 = SPAM
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Field "params.seed" is added to world seed to form seed for noise function.
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Depths, where the wein should generate can be controlled by fields hmin and
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hmax. They can be set to nil to generate everywhere.
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Layers, where the vein should generate in must be listed in Field
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"params.layer".
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## Register ore
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rocks.register_ore=function( vein, node, params )
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This function registers ore or rock to be generated in vein "vein". Node to
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be generated is "node". Params specify parameters, where the rock should
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spawn.
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If noise is larger than Params.treshold, the ore is spawned (set to 2 to
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spawn everywhere in the vein, 0.8=only in middle). Params.chance specify
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the chance (/100%) of ore being spawned (0=never 1=always 0.5=50%).
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If multiple ores pass the treshhold and chance tests, ore with highest
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treshold and smallest chance is spawned.
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