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Mgfractal: Create a choice of 4 mandelbrot formulas
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@ -970,11 +970,16 @@ mgflat_np_cave2 (Mapgen flat cave2 noise parameters) noise_params 0, 12, (128, 1
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[***Mapgen fractal]
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# Map generation attributes specific to Mapgen fractal.
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# 'julia' selects a julia set to be generated instead of a mandelbrot set.
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# The 'julia' flag results in the corresponding julia set being generated.
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# Flags that are not specified in the flag string are not modified from the default.
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# Flags starting with "no" are used to explicitly disable them.
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mgfractal_spflags (Mapgen fractal flags) flags nojulia julia,nojulia
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# Choice of 4 mandelbrot set variations.
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# 1 = 4D "Roundy" mandelbrot set, 2 = 4D "Squarry" mandelbrot set,
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# 3 = 4D "Mandy Cousin" mandelbrot set, 4 = 4D mandelbrot set variation.
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mgfractal_formula (Mapgen fractal formula) int 1 1 4
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# Mandelbrot set: Iterations of the recursive function.
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# Controls scale of finest detail.
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mgfractal_m_iterations (Mapgen fractal mandelbrot iterations) int 9
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@ -1234,12 +1234,18 @@
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#### Mapgen fractal
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# Map generation attributes specific to Mapgen fractal.
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# 'julia' selects a julia set to be generated instead of a mandelbrot set.
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# The 'julia' flag results in the corresponding julia set being generated.
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# Flags that are not specified in the flag string are not modified from the default.
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# Flags starting with "no" are used to explicitly disable them.
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# type: flags possible values: julia, nojulia
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# mgfractal_spflags = nojulia
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# Choice of 4 mandelbrot set variations.
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# 1 = 4D "Roundy" mandelbrot set, 2 = 4D "Squarry" mandelbrot set,
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# 3 = 4D "Mandy Cousin" mandelbrot set, 4 = 4D mandelbrot set variation.
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# type: int
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# mgfractal_formula = 1
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# Mandelbrot set: Iterations of the recursive function.
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# Controls scale of finest detail.
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# type: int
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@ -67,6 +67,8 @@ MapgenFractal::MapgenFractal(int mapgenid, MapgenParams *params, EmergeManager *
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MapgenFractalParams *sp = (MapgenFractalParams *)params->sparams;
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this->spflags = sp->spflags;
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this->formula = sp->formula;
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this->m_iterations = sp->m_iterations;
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this->m_scale = sp->m_scale;
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this->m_offset = sp->m_offset;
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@ -145,6 +147,8 @@ MapgenFractalParams::MapgenFractalParams()
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{
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spflags = 0;
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formula = 1;
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m_iterations = 9; // Mandelbrot set only
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m_scale = v3f(1024.0, 256.0, 1024.0);
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m_offset = v3f(1.75, 0.0, 0.0);
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@ -170,6 +174,8 @@ void MapgenFractalParams::readParams(const Settings *settings)
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{
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settings->getFlagStrNoEx("mgfractal_spflags", spflags, flagdesc_mapgen_fractal);
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settings->getU16NoEx("mgfractal_formula", formula);
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settings->getU16NoEx("mgfractal_m_iterations", m_iterations);
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settings->getV3FNoEx("mgfractal_m_scale", m_scale);
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settings->getV3FNoEx("mgfractal_m_offset", m_offset);
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@ -195,6 +201,8 @@ void MapgenFractalParams::writeParams(Settings *settings) const
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{
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settings->setFlagStr("mgfractal_spflags", spflags, flagdesc_mapgen_fractal, U32_MAX);
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settings->setU16("mgfractal_formula", formula);
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settings->setU16("mgfractal_m_iterations", m_iterations);
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settings->setV3F("mgfractal_m_scale", m_scale);
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settings->setV3F("mgfractal_m_offset", m_offset);
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@ -403,11 +411,32 @@ bool MapgenFractal::getFractalAtPoint(s16 x, s16 y, s16 z)
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u16 iterations = spflags & MGFRACTAL_JULIA ? j_iterations : m_iterations;
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for (u16 iter = 0; iter < iterations; iter++) {
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// 4D "Roundy" Mandelbrot set
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float nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
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float ny = 2.0f * (ox * oy + oz * ow) + cy;
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float nz = 2.0f * (ox * oz + oy * ow) + cz;
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float nw = 2.0f * (ox * ow + oy * oz) + cw;
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float nx = 0.0f;
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float ny = 0.0f;
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float nz = 0.0f;
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float nw = 0.0f;
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if (formula == 1) { // 4D "Roundy" Mandelbrot Set
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nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
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ny = 2.0f * (ox * oy + oz * ow) + cy;
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nz = 2.0f * (ox * oz + oy * ow) + cz;
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nw = 2.0f * (ox * ow + oy * oz) + cw;
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} else if (formula == 2) { // 4D "Squarry" Mandelbrot Set
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nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
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ny = 2.0f * (ox * oy + oz * ow) + cy;
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nz = 2.0f * (ox * oz + oy * ow) + cz;
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nw = 2.0f * (ox * ow - oy * oz) + cw;
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} else if (formula == 3) { // 4D "Mandy Cousin" Mandelbrot Set
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nx = ox * ox - oy * oy - oz * oz + ow * ow + cx;
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ny = 2.0f * (ox * oy + oz * ow) + cy;
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nz = 2.0f * (ox * oz + oy * ow) + cz;
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nw = 2.0f * (ox * ow + oy * oz) + cw;
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} else if (formula == 4) { // 4D Mandelbrot Set Variation
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nx = ox * ox - oy * oy - oz * oz - ow * ow + cx;
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ny = 2.0f * (ox * oy + oz * ow) + cy;
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nz = 2.0f * (ox * oz - oy * ow) + cz;
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nw = 2.0f * (ox * ow + oy * oz) + cw;
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}
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if (nx * nx + ny * ny + nz * nz + nw * nw > 4.0f)
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return false;
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@ -36,6 +36,8 @@ extern FlagDesc flagdesc_mapgen_fractal[];
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struct MapgenFractalParams : public MapgenSpecificParams {
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u32 spflags;
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u16 formula;
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u16 m_iterations;
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v3f m_scale;
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v3f m_offset;
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@ -76,6 +78,8 @@ public:
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v3s16 full_node_min;
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v3s16 full_node_max;
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u16 formula;
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u16 m_iterations;
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v3f m_scale;
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v3f m_offset;
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