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Add support for NoiseParams in minetest.get_perlin() and add docs on NoiseParams to lua_api.txt

This commit is contained in:
kwolekr 2014-12-12 02:02:26 -05:00
parent c151099b79
commit 2b8180a417
4 changed files with 100 additions and 33 deletions

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@ -482,23 +482,65 @@ A box of a regular node would look like:
type = "leveled" is same as "fixed", but y2 will be automatically set to level from param2
Meshes
-----------
If drawtype "mesh" is used tiles should hold model materials textures.
Only static meshes are implemented.
For supported model formats see Irrlicht engine documentation.
Noise Parameters
--------------------
Noise Parameters, or commonly called NoiseParams, define the properties of perlin noise.
- offset
Offset that the noise is translated by (i.e. added) after calculation.
- scale
Factor that the noise is scaled by (i.e. multiplied) after calculation.
- spread
Vector containing values by which each coordinate is divided by before calculation.
Higher spread values result in larger noise features.
A value of {x=250, y=250, z=250} is common.
- seed
Random seed for the noise. Add the world seed to a seed offset for world-unique noise.
In the case of minetest.get_perlin(), this value has the world seed automatically added.
- octaves
Number of times the noise gradient is accumulated into the noise.
Increase this number to increase the amount of detail in the resulting noise.
A value of 6 is common.
- persistence
Factor by which the effect of the noise gradient function changes with each successive octave.
Values less than 1 make the details of successive octaves' noise diminish, while values
greater than 1 make successive octaves stronger.
A value of 0.6 is common.
- lacunarity
Factor by which the noise feature sizes change with each successive octave.
A value of 2.0 is common.
- flags
Leave this field unset for no special handling.
Currently supported are:
- defaults
Specify this if you would like to keep auto-selection of eased/not-eased while specifying
some other flags.
- eased
Maps noise gradient values onto a quintic S-curve before performing interpolation.
This results in smooth, rolling noise. Disable this for sharp-looking noise.
If no flags are specified (or defaults is), 2D noise is eased and 3D noise is not eased.
- absvalue
Accumulates the absolute value of each noise gradient result.
Ore types
---------------
These tell in what manner the ore is generated.
All default ores are of the uniformly-distributed scatter type.
- scatter
- scatter
Randomly chooses a location and generates a cluster of ore.
If noise_params is specified, the ore will be placed if the 3d perlin noise at
that point is greater than the noise_threshold, giving the ability to create a non-equal
distribution of ore.
- sheet
- sheet
Creates a sheet of ore in a blob shape according to the 2d perlin noise described by noise_params.
The relative height of the sheet can be controlled by the same perlin noise as well, by specifying
a non-zero 'scale' parameter in noise_params. IMPORTANT: The noise is not transformed by offset or
@ -506,10 +548,11 @@ All default ores are of the uniformly-distributed scatter type.
The height of the blob is randomly scattered, with a maximum height of clust_size.
clust_scarcity and clust_num_ores are ignored.
This is essentially an improved version of the so-called "stratus" ore seen in some unofficial mods.
- claylike - NOT YET IMPLEMENTED
- claylike - NOT YET IMPLEMENTED
Places ore if there are no more than clust_scarcity number of specified nodes within a Von Neumann
neighborhood of clust_size radius.
Ore attributes
-------------------
See section Flag Specifier Format.
@ -534,6 +577,7 @@ The default value is simple, and is currently the only type supported.
probability of a node randomly appearing when placed. This decoration type is intended to be used
for multi-node sized discrete structures, such as trees, cave spikes, rocks, and so on.
Schematic specifier
--------------------
A schematic specifier identifies a schematic by either a filename to a Minetest Schematic file (.mts)
@ -552,6 +596,7 @@ When passed to minetest.create_schematic, probability is an integer value rangin
Important note: Node aliases cannot be used for a raw schematic provided when registering as a decoration.
Schematic attributes
---------------------
See section Flag Specifier Format.
@ -563,6 +608,7 @@ Currently supported flags: place_center_x, place_center_y, place_center_z
- place_center_z
Placement of this decoration is centered along the Z axis.
HUD element types
-------------------
The position field is used for all element types.
@ -1529,6 +1575,7 @@ minetest.find_node_near(pos, radius, nodenames) -> pos or nil
^ nodenames: e.g. {"ignore", "group:tree"} or "default:dirt"
minetest.find_nodes_in_area(minp, maxp, nodenames) -> list of positions
^ nodenames: e.g. {"ignore", "group:tree"} or "default:dirt"
minetest.get_perlin(noiseparams)
minetest.get_perlin(seeddiff, octaves, persistence, scale)
^ Return world-specific perlin noise (int(worldseed)+seeddiff)
minetest.get_voxel_manip()
@ -2109,8 +2156,8 @@ methods:
implementation making bad distribution otherwise.
PerlinNoise: A perlin noise generator
- Can be created via PerlinNoise(seed, octaves, persistence, scale)
- Also minetest.get_perlin(seeddiff, octaves, persistence, scale)
- Can be created via PerlinNoise(seed, octaves, persistence, scale) or PerlinNoise(noiseparams)
- Also minetest.get_perlin(seeddiff, octaves, persistence, scale) or minetest.get_perlin(noiseparams)
methods:
- get2d(pos) -> 2d noise value at pos={x=,y=}
- get3d(pos) -> 3d noise value at pos={x=,y=,z=}