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Stratum ore: Allow use with no noise for simple horizontal strata
If either of the 2 noise parameters are omitted the ore will occur from y_min to y_max in a simple horizontal stratum. As this does not compute noise performance improves, and is ideal for placing many layers. Clean up some nearby ore documentation.
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@ -1098,12 +1098,17 @@ Creates a deformed sphere of ore according to 3d perlin noise described by
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### `vein`
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Creates veins of ore varying in density by according to the intersection of two
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instances of 3d perlin noise with diffferent seeds, both described by
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`noise_params`. `random_factor` varies the influence random chance has on
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placement of an ore inside the vein, which is `1` by default. Note that
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modifying this parameter may require adjusting `noise_threshold`.
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`noise_params`.
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`random_factor` varies the influence random chance has on placement of an ore
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inside the vein, which is `1` by default. Note that modifying this parameter may
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require adjusting `noise_threshold`.
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The parameters `clust_scarcity`, `clust_num_ores`, and `clust_size` are ignored
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by this ore type. This ore type is difficult to control since it is sensitive
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to small changes. The following is a decent set of parameters to work from:
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by this ore type.
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This ore type is difficult to control since it is sensitive to small changes.
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The following is a decent set of parameters to work from:
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noise_params = {
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offset = 0,
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@ -1122,16 +1127,24 @@ computationally expensive than any other ore.
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### `stratum`
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Creates a single undulating ore stratum that is continuous across mapchunk
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borders and horizontally spans the world.
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The 2D perlin noise described by `noise_params` varies the Y co-ordinate of the
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stratum midpoint. The 2D perlin noise described by `np_stratum_thickness`
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varies the stratum's vertical thickness (in units of nodes). Due to being
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continuous across mapchunk borders the stratum's vertical thickness is
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unlimited.
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`y_min` and `y_max` define the limits of the ore generation and for performance
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reasons should be set as close together as possible but without clipping the
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stratum's Y variation.
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If either of the 2 noise parameters are omitted the ore will occur from y_min
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to y_max in a simple horizontal stratum. As this does not compute noise
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performance improves, and is ideal for placing many layers.
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Each node in the stratum has a 1-in-`clust_scarcity` chance of being ore, so a
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solid-ore stratum would require a `clust_scarcity` of 1.
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The parameters `clust_num_ores`, `clust_size`, `noise_threshold` and
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`random_factor` are ignored by this ore type.
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@ -4713,24 +4726,36 @@ Definition tables
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-- ^ Number of ores in a cluster
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clust_size = 3,
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-- ^ Size of the bounding box of the cluster
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-- ^ In this example, there is a 3x3x3 cluster where 8 out of the 27 nodes are coal ore
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-- ^ In this example, there is a 3x3x3 cluster where 8 out of the 27 nodes
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-- ^ are coal ore.
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y_min = -31000,
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y_max = 64,
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-- ^ Lower and upper limits for ore.
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flags = "",
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-- ^ Attributes for this ore generation
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noise_threshold = 0.5,
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-- ^ If noise is above this threshold, ore is placed. Not needed for a uniform distribution
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noise_params = {offset=0, scale=1, spread={x=100, y=100, z=100}, seed=23, octaves=3, persist=0.70}
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-- ^ NoiseParams structure describing the perlin noise used for ore distribution.
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-- ^ Needed for sheet ore_type. Omit from scatter ore_type for a uniform ore distribution
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-- ^ If noise is above this threshold, ore is placed. Not needed for a
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-- ^ uniform distribution.
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noise_params = {
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offset = 0,
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scale = 1,
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spread = {x = 100, y = 100, z = 100},
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seed = 23,
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octaves = 3,
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persist = 0.7
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},
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-- ^ NoiseParams structure describing one of the perlin noises used for ore
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-- ^ distribution.
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-- ^ Omit from "scatter" ore for a uniform ore distribution.
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-- ^ Omit from "stratum ore for a simple horizontal strata from y_min to y_max.
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random_factor = 1.0,
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-- ^ Multiplier of the randomness contribution to the noise value at any
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-- ^ given point to decide if ore should be placed. Set to 0 for solid veins.
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-- ^ This parameter is only valid for ore_type == "vein".
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biomes = {"desert", "rainforest"}
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-- ^ List of biomes in which this decoration occurs. Occurs in all biomes if this is omitted,
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-- ^ and ignored if the Mapgen being used does not support biomes.
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-- ^ List of biomes in which this decoration occurs.
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-- ^ Occurs in all biomes if this is omitted, and ignored if the Mapgen being
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-- ^ used does not support biomes.
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-- ^ Can be a list of (or a single) biome names, IDs, or definitions.
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}
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@ -433,14 +433,16 @@ void OreStratum::generate(MMVManip *vm, int mapseed, u32 blockseed,
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PcgRandom pr(blockseed + 4234);
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MapNode n_ore(c_ore, 0, ore_param2);
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if (!noise) {
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int sx = nmax.X - nmin.X + 1;
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int sz = nmax.Z - nmin.Z + 1;
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noise = new Noise(&np, 0, sx, sz);
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noise_stratum_thickness = new Noise(&np_stratum_thickness, 0, sx, sz);
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if (flags & OREFLAG_USE_NOISE) {
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if (!(noise && noise_stratum_thickness)) {
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int sx = nmax.X - nmin.X + 1;
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int sz = nmax.Z - nmin.Z + 1;
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noise = new Noise(&np, 0, sx, sz);
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noise_stratum_thickness = new Noise(&np_stratum_thickness, 0, sx, sz);
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}
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noise->perlinMap2D(nmin.X, nmin.Z);
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noise_stratum_thickness->perlinMap2D(nmin.X, nmin.Z);
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}
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noise->perlinMap2D(nmin.X, nmin.Z);
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noise_stratum_thickness->perlinMap2D(nmin.X, nmin.Z);
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size_t index = 0;
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@ -452,10 +454,18 @@ void OreStratum::generate(MMVManip *vm, int mapseed, u32 blockseed,
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continue;
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}
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float nmid = noise->result[index];
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float nhalfthick = noise_stratum_thickness->result[index] / 2.0f;
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int y0 = MYMAX(nmin.Y, nmid - nhalfthick);
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int y1 = MYMIN(nmax.Y, nmid + nhalfthick);
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int y0;
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int y1;
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if (flags & OREFLAG_USE_NOISE) {
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float nmid = noise->result[index];
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float nhalfthick = noise_stratum_thickness->result[index] / 2.0f;
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y0 = MYMAX(nmin.Y, nmid - nhalfthick);
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y1 = MYMIN(nmax.Y, nmid + nhalfthick);
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} else {
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y0 = nmin.Y;
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y1 = nmax.Y;
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}
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for (int y = y0; y <= y1; y++) {
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if (pr.range(1, clust_scarcity) != 1)
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@ -135,7 +135,7 @@ public:
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class OreStratum : public Ore {
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public:
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static const bool NEEDS_NOISE = true;
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static const bool NEEDS_NOISE = false;
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NoiseParams np_stratum_thickness;
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Noise *noise_stratum_thickness = nullptr;
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@ -1156,7 +1156,9 @@ int ModApiMapgen::l_register_ore(lua_State *L)
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OreStratum *orestratum = (OreStratum *)ore;
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lua_getfield(L, index, "np_stratum_thickness");
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read_noiseparams(L, -1, &orestratum->np_stratum_thickness);
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// If thickness noise missing unset 'use noise' flag
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if (!read_noiseparams(L, -1, &orestratum->np_stratum_thickness))
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ore->flags &= ~OREFLAG_USE_NOISE;
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lua_pop(L, 1);
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break;
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