From 2b8180a417465845759096670f498bf71cd39403 Mon Sep 17 00:00:00 2001 From: kwolekr Date: Fri, 12 Dec 2014 02:02:26 -0500 Subject: Add support for NoiseParams in minetest.get_perlin() and add docs on NoiseParams to lua_api.txt --- doc/lua_api.txt | 59 +++++++++++++++++++++++++++++++++++++----- src/script/lua_api/l_env.cpp | 18 +++++++++---- src/script/lua_api/l_noise.cpp | 46 +++++++++++++++++++++----------- src/script/lua_api/l_noise.h | 10 +++---- 4 files changed, 100 insertions(+), 33 deletions(-) diff --git a/doc/lua_api.txt b/doc/lua_api.txt index 4e63a02e0..6b55526f5 100644 --- a/doc/lua_api.txt +++ b/doc/lua_api.txt @@ -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=} diff --git a/src/script/lua_api/l_env.cpp b/src/script/lua_api/l_env.cpp index 8f1f851d7..3d2e20424 100644 --- a/src/script/lua_api/l_env.cpp +++ b/src/script/lua_api/l_env.cpp @@ -590,12 +590,20 @@ int ModApiEnvMod::l_get_perlin(lua_State *L) { GET_ENV_PTR; - int seeddiff = luaL_checkint(L, 1); - int octaves = luaL_checkint(L, 2); - float persistence = luaL_checknumber(L, 3); - float scale = luaL_checknumber(L, 4); + NoiseParams params; - LuaPerlinNoise *n = new LuaPerlinNoise(seeddiff + int(env->getServerMap().getSeed()), octaves, persistence, scale); + if (lua_istable(L, 1)) { + read_noiseparams(L, 1, ¶ms); + } else { + params.seed = luaL_checkint(L, 1); + params.octaves = luaL_checkint(L, 2); + params.persist = luaL_checknumber(L, 3); + params.spread = v3f(1, 1, 1) * luaL_checknumber(L, 4); + } + + params.seed += (int)env->getServerMap().getSeed(); + + LuaPerlinNoise *n = new LuaPerlinNoise(¶ms); *(void **)(lua_newuserdata(L, sizeof(void *))) = n; luaL_getmetatable(L, "PerlinNoise"); lua_setmetatable(L, -2); diff --git a/src/script/lua_api/l_noise.cpp b/src/script/lua_api/l_noise.cpp index 6c6b35358..f4ae3fb08 100644 --- a/src/script/lua_api/l_noise.cpp +++ b/src/script/lua_api/l_noise.cpp @@ -36,8 +36,8 @@ int LuaPerlinNoise::l_get2d(lua_State *L) { NO_MAP_LOCK_REQUIRED; LuaPerlinNoise *o = checkobject(L, 1); - v2f pos2d = read_v2f(L,2); - lua_Number val = noise2d_perlin(pos2d.X/o->scale, pos2d.Y/o->scale, o->seed, o->octaves, o->persistence); + v2f p = read_v2f(L, 2); + lua_Number val = NoisePerlin2D(&o->np, p.X, p.Y, 0); lua_pushnumber(L, val); return 1; } @@ -47,23 +47,30 @@ int LuaPerlinNoise::l_get3d(lua_State *L) { NO_MAP_LOCK_REQUIRED; LuaPerlinNoise *o = checkobject(L, 1); - v3f pos3d = read_v3f(L,2); - lua_Number val = noise3d_perlin(pos3d.X/o->scale, pos3d.Y/o->scale, pos3d.Z/o->scale, o->seed, o->octaves, o->persistence); + v3f p = read_v3f(L, 2); + lua_Number val = NoisePerlin3D(&o->np, p.X, p.Y, p.Z, 0); lua_pushnumber(L, val); return 1; } -LuaPerlinNoise::LuaPerlinNoise(int a_seed, int a_octaves, float a_persistence, - float a_scale): - seed(a_seed), - octaves(a_octaves), - persistence(a_persistence), - scale(a_scale) +LuaPerlinNoise::LuaPerlinNoise(NoiseParams *params) : + np(*params) { } +/* +LuaPerlinNoise::LuaPerlinNoise(int a_seed, int a_octaves, + float a_persistence, float a_scale) +{ + np.seed = a_seed; + np.octaves = a_octaves; + np.persist = a_persistence; + np.spread = v3f(a_scale, a_scale, a_scale); +} +*/ + LuaPerlinNoise::~LuaPerlinNoise() { } @@ -74,11 +81,20 @@ LuaPerlinNoise::~LuaPerlinNoise() int LuaPerlinNoise::create_object(lua_State *L) { NO_MAP_LOCK_REQUIRED; - int seed = luaL_checkint(L, 1); - int octaves = luaL_checkint(L, 2); - float persistence = luaL_checknumber(L, 3); - float scale = luaL_checknumber(L, 4); - LuaPerlinNoise *o = new LuaPerlinNoise(seed, octaves, persistence, scale); + + NoiseParams params; + + if (lua_istable(L, 1)) { + read_noiseparams(L, 1, ¶ms); + } else { + params.seed = luaL_checkint(L, 1); + params.octaves = luaL_checkint(L, 2); + params.persist = luaL_checknumber(L, 3); + params.spread = v3f(1, 1, 1) * luaL_checknumber(L, 4); + } + + LuaPerlinNoise *o = new LuaPerlinNoise(¶ms); + *(void **)(lua_newuserdata(L, sizeof(void *))) = o; luaL_getmetatable(L, className); lua_setmetatable(L, -2); diff --git a/src/script/lua_api/l_noise.h b/src/script/lua_api/l_noise.h index 6f6173fc2..6e3029aef 100644 --- a/src/script/lua_api/l_noise.h +++ b/src/script/lua_api/l_noise.h @@ -29,10 +29,8 @@ with this program; if not, write to the Free Software Foundation, Inc., */ class LuaPerlinNoise : public ModApiBase { private: - int seed; - int octaves; - float persistence; - float scale; + NoiseParams np; + static const char className[]; static const luaL_reg methods[]; @@ -45,9 +43,7 @@ private: static int l_get3d(lua_State *L); public: - LuaPerlinNoise(int a_seed, int a_octaves, float a_persistence, - float a_scale); - + LuaPerlinNoise(NoiseParams *params); ~LuaPerlinNoise(); // LuaPerlinNoise(seed, octaves, persistence, scale) -- cgit v1.2.3