public void TestMultithreaded(int threadCount)
{
var source = new ThreadIdModule();
var cache = new Cache { Source0 = source };
var threadArray = new Thread[threadCount];
bool startFlag = false;
for (int i = 0; i < threadArray.Length; i++)
{
threadArray[i] = new Thread(() =>
{
for (int k = 0; k < 500; k++)
{
SpinWait.SpinUntil(() => startFlag);
var sourceValue = source.GetValue(0, 0, 0);
Assert.Equal(sourceValue, cache.GetValue(0, 0, 0));
Assert.Equal(sourceValue, cache.GetValue(0, 0, 0));
}
});
}
for (int i = 0; i < threadArray.Length; i++)
threadArray[i].Start();
startFlag = true;
for (int i = 0; i < threadArray.Length; i++)
threadArray[i].Join();
}
public void TestGetValueCalledOnce(double x, double y, double z)
{
var testModule = new CounterModule();
var cache = new Cache { Source0 = testModule };
var cachedValue = cache.GetValue(x, y, z);
// Make sure repeated calls do not reach the test module's counter
Assert.Equal(cachedValue, cache.GetValue(x, y, z));
Assert.Equal(cachedValue, cache.GetValue(x, y, z));
}
Module CreateMountainousTerrain()
{
// This subgroup generates the base-mountain elevations. Other subgroups
// will add the ridges and low areas to the base elevations.
//
// -1.0 represents low mountainous terrain and +1.0 represents high
// mountainous terrain.
//
// [Mountain-base-definition subgroup]: Caches the output value from the
// warped-mountains-and-valleys module.
var mountainBaseDefinition = new Cache
{
// [Warped-mountains-and-valleys module]: This turbulence module warps
// the output value from the coarse-turbulence module. This turbulence
// has a higher frequency, but lower power, than the coarse-turbulence
// module, adding some fine detail to it.
Source0 = new Turbulence
{
Seed = Settings.Seed + 33,
Frequency = 21221,
Power = 1.0 / 120157.0 * Settings.MountainsTwist,
// [Coarse-turbulence module]: This turbulence module warps the output
// value from the mountain-and-valleys module, adding some coarse detail
// to it.
Source0 = new Turbulence
{
Seed = Settings.Seed + 32,
Frequency = 1337,
Power = 1.0 / 6730.0 * Settings.MountainsTwist,
Roughness = 4,
// [Mountains-and-valleys module]: This blender module merges the
// scaled-mountain-ridge module and the scaled-river-valley module
// together. It causes the low-lying areas of the terrain to become
// smooth, and causes the high-lying areas of the terrain to contain
// ridges. To do this, it uses the scaled-river-valley module as the
// control module, causing the low-flat module to appear in the lower
// areas and causing the scaled-mountain-ridge module to appear in the
// higher areas.
Source0 = new Blend
{
// [Low-flat module]: This low constant value is used by
// the Mountains-and-valleys module.
Source0 = new Constant
{
ConstantValue = -1,
},
// [Scaled-river-valley module]: Next, a scale/bias module applies a
// scaling factor of -2.0 to the output value from the river-valley
// module. This stretches the possible elevation values because one-
// octave ridged-multifractal noise has a lower range of output values
// than multiple-octave ridged-multifractal noise. The negative scaling
// factor inverts the range of the output value, turning the ridges from
// the river-valley module into valleys.
Source1 = new ScaleBias
{
Scale = 0.5,
Bias = 0.375,
// [Mountain-ridge module]: This ridged-multifractal-noise module
// generates the mountain ridges.
Source0 = new RidgedMulti
{
Seed = Settings.Seed + 30,
Frequency = 1723,
Lacunarity = Settings.MountainLacunarity,
OctaveCount = 4,
Quality = NoiseQuality.Standard,
},
},
// [Scaled-mountain-ridge module]: Next, a scale/bias module scales the
// output value from the mountain-ridge module so that its ridges are not
// too high. The reason for this is that another subgroup adds actual
// mountainous terrain to these ridges.
Control = new ScaleBias
{
Scale = -2,
Bias = -0.5,
// [River-valley module]: This ridged-multifractal-noise module generates
// the river valleys. It has a much lower frequency than the mountain-
// ridge module so that more mountain ridges will appear outside of the
// valleys. Note that this noise module generates ridged-multifractal
// noise using only one octave; this information will be important in the
// next step.
Source0 = new RidgedMulti
{
Seed = Settings.Seed + 31,
Frequency = 367,
Lacunarity = Settings.MountainLacunarity,
OctaveCount = 1,
Quality = NoiseQuality.Best,
},
},
},
},
},
};
// Generates the mountainous terrain that appears at high
// elevations within the mountain ridges.
//
// -1.0 represents the lowest elevations and +1.0 represents the highest
// elevations.
//
// [Mountain-base-definition subgroup]: Caches the output value from the
// warped-mountains-and-valleys module.
var mountainousHigh = new Cache
{
// [Warped-mountains-and-valleys module]: This turbulence module warps
// the output value from the coarse-turbulence module. This turbulence
// has a higher frequency, but lower power, than the coarse-turbulence
// module, adding some fine detail to it.
Source0 = new Turbulence
{
Seed = Settings.Seed + 42,
Frequency = 31511,
Power = 1.0 / 180371.0 * Settings.MountainsTwist,
Roughness = 4,
// [High-mountains module]: Next, a maximum-value module causes more
// mountains to appear at the expense of valleys. It does this by
// ensuring that only the maximum of the output values from the two
// ridged-multifractal-noise modules contribute to the output value of
// this subgroup.
Source0 = new Max
{
// [Mountain-basis-0 module]: This ridged-multifractal-noise module,
// along with the mountain-basis-1 module, generates the individual
// mountains.
Source0 = new RidgedMulti
{
Seed = Settings.Seed + 40,
Frequency = 2371,
Lacunarity = Settings.MountainLacunarity,
OctaveCount = 3,
Quality = NoiseQuality.Best,
},
// [Mountain-basis-1 module]: This ridged-multifractal-noise module,
// along with the mountain-basis-0 module, generates the individual
// mountains.
Source1 = new RidgedMulti
{
Seed = Settings.Seed + 41,
Frequency = 2341,
Lacunarity = Settings.MountainLacunarity,
OctaveCount = 3,
Quality = NoiseQuality.Best,
},
},
}
};
// Generates the mountainous terrain that appears at low
// elevations within the river valleys.
//
// -1.0 represents the lowest elevations and +1.0 represents the highest
// elevations.
//
// [Low-mountainous-terrain subgroup]: Caches the output value from the
// low-moutainous-terrain module.
var mountainousLow = new Cache
{
Source0 = new Multiply
{
// [Lowland-basis-0 module]: This ridged-multifractal-noise module,
// along with the lowland-basis-1 module, produces the low mountainous
// terrain.
Source0 = new RidgedMulti
{
Seed = Settings.Seed + 50,
Frequency = 1381,
Lacunarity = Settings.MountainLacunarity,
OctaveCount = 8,
Quality = NoiseQuality.Best,
},
// [Lowland-basis-1 module]: This ridged-multifractal-noise module,
// along with the lowland-basis-0 module, produces the low mountainous
// terrain.
Source1 = new RidgedMulti
{
Seed = Settings.Seed + 51,
Frequency = 1427,
Lacunarity = Settings.MountainLacunarity,
OctaveCount = 8,
Quality = NoiseQuality.Best,
},
},
};
// Generates the final mountainous terrain by combining the
// high-mountainous-terrain subgroup with the low-mountainous-terrain
// subgroup.
//
// -1.0 represents the lowest elevations and +1.0 represents the highest
// elevations.
//
// [Mountainous-terrain group]: Caches the output value from the
// glaciated-mountainous-terrain module. This is the output value for
// the entire mountainous-terrain group.
var mountainousTerrain = new Cache
{
// [Glaciated-mountainous-terrain-module]: This exponential-curve module
// applies an exponential curve to the output value from the scaled-
// mountainous-terrain module. This causes the slope of the mountains to
// smoothly increase towards higher elevations, as if a glacier grinded
// out those mountains. This exponential-curve module expects the output
// value to range from -1.0 to +1.0.
Source0 = new Exponent
{
Exp = Settings.MountainGlaciation,
// [Scaled-mountainous-terrain-module]: This scale/bias module slightly
// reduces the range of the output value from the combined-mountainous-
// terrain module, decreasing the heights of the mountain peaks.
Source0 = new ScaleBias
{
Scale = 0.8,
Bias = 0,
// [Combined-mountainous-terrain module]: Note that at this point, the
// entire terrain is covered in high mountainous terrain, even at the low
// elevations. To make sure the mountains only appear at the higher
// elevations, this selector module causes low mountainous terrain to
// appear at the low elevations (within the valleys) and the high
// mountainous terrain to appear at the high elevations (within the
// ridges.) To do this, this noise module selects the output value from
// the added-high-mountainous-terrain module if the output value from the
// mountain-base-definition subgroup is higher than a set amount.
// Otherwise, this noise module selects the output value from the scaled-
// low-mountainous-terrain module.
Source0 = new Select
{
// [Scaled-low-mountainous-terrain module]: First, this scale/bias module
// scales the output value from the low-mountainous-terrain subgroup to a
// very low value and biases it towards -1.0. This results in the low
// mountainous areas becoming more-or-less flat with little variation.
// This will also result in the low mountainous areas appearing at the
// lowest elevations in this subgroup.
Source0 = new ScaleBias
{
Scale = 0.03125,
Bias = -0.96875,
Source0 = mountainousLow,
},
// [Added-high-mountainous-terrain module]: This addition module adds the
// output value from the scaled-high-mountainous-terrain module to the
// output value from the mountain-base-definition subgroup. Mountains
// now appear all over the terrain.
Source1 = new Add
{
// [Scaled-high-mountainous-terrain module]: Next, this scale/bias module
// scales the output value from the high-mountainous-terrain subgroup to
// 1/4 of its initial value and biases it so that its output value is
// usually positive.
Source0 = new ScaleBias
{
Scale = 0.25,
Bias = 0.25,
Source0 = mountainousHigh,
},
Source1 = mountainBaseDefinition,
},
Control = mountainBaseDefinition,
},
},
},
};
return mountainousTerrain;
}
Module CreateHillyTerrain()
{
// Generates the hilly terrain.
//
// -1.0 represents the lowest elevations and +1.0 represents the highest
// elevations.
//
// [Hilly-terrain group]: Caches the output value from the warped-hilly-
// terrain module. This is the output value for the entire hilly-
// terrain group.
var hillyTerrain = new Cache
{
// [Warped-hilly-terrain module]: This turbulence module warps the
// output value from the coarse-turbulence module. This turbulence has
// a higher frequency, but lower power, than the coarse-turbulence
// module, adding some fine detail to it.
Source0 = new Turbulence
{
Seed = Settings.Seed + 63,
Frequency = 21617,
Power = 1.0 / 117529 * Settings.HillsTwist,
Roughness = 6,
// [Coarse-turbulence module]: This turbulence module warps the output
// value from the increased-slope-hilly-terrain module, adding some
// coarse detail to it.
Source0 = new Turbulence
{
Seed = Settings.Seed + 62,
Frequency = 1531,
Power = 1.0 / 16921 * Settings.HillsTwist,
Roughness = 4,
// [Increased-slope-hilly-terrain module]: To increase the hill slopes at
// higher elevations, this exponential-curve module applies an
// exponential curve to the output value the scaled-hills-and-valleys
// module. This exponential-curve module expects the input value to
// range from -1.0 to 1.0.
Source0 = new Exponent
{
Exp = 1.375,
// [Scaled-hills-and-valleys module]: This scale/bias module slightly
// reduces the range of the output value from the hills-and-valleys
// module, decreasing the heights of the hilltops.
Source0 = new ScaleBias
{
Scale = 0.75,
Bias = -0.25,
// [Mountains-and-valleys module]: This blender module merges the
// scaled-hills module and the scaled-river-valley module together. It
// causes the low-lying areas of the terrain to become smooth, and causes
// the high-lying areas of the terrain to contain hills. To do this, it
// uses the scaled-hills module as the control module, causing the low-
// flat module to appear in the lower areas and causing the scaled-river-
// valley module to appear in the higher areas.
Source0 = new Blend
{
// [Low-flat module]: This low constant value is used by
// the Mountains-and-valleys module.
Source0 = new Constant
{
ConstantValue = -1,
},
// [Scaled-river-valley module]: Next, a scale/bias module applies a
// scaling factor of -2.0 to the output value from the river-valley
// module. This stretches the possible elevation values because one-
// octave ridged-multifractal noise has a lower range of output values
// than multiple-octave ridged-multifractal noise. The negative scaling
// factor inverts the range of the output value, turning the ridges from
// the river-valley module into valleys.
Source1 = new ScaleBias
{
Scale = -2,
Bias = -0.5,
// [River-valley module]: This ridged-multifractal-noise module generates
// the river valleys. It has a much lower frequency so that more hills
// will appear in between the valleys. Note that this noise module
// generates ridged-multifractal noise using only one octave; this
// information will be important in the next step.
Source0 = new RidgedMulti
{
Seed = Settings.Seed + 61,
Frequency = 367.5,
Lacunarity = Settings.HillsLacunarity,
OctaveCount = 1,
Quality = NoiseQuality.Best,
},
},
// [Scaled-hills module]: Next, a scale/bias module scales the output
// value from the hills module so that its hilltops are not too high.
// The reason for this is that these hills are eventually added to the
// river valleys (see below.)
Control = new ScaleBias
{
Scale = 0.5,
Bias = 0.5,
// [Hills module]: This billow-noise module generates the hills.
Source0 = new Billow
{
Seed = Settings.Seed + 60,
Frequency = 1663,
Persistence = 0.5,
Lacunarity = Settings.HillsLacunarity,
OctaveCount = 6,
Quality = NoiseQuality.Best,
},
},
},
},
},
},
},
};
return hillyTerrain;
}
Module CreateBadlandsTerrain()
{
// Generates the sandy terrain for the badlands.
//
// -1.0 represents the lowest elevations and +1.0 represents the highest
// elevations.
//
// [Badlands-sand subgroup]: Caches the output value from the dunes-with-
// detail module.
var badlandsSand = new Cache
{
// [Dunes-with-detail module]: This addition module combines the scaled-
// sand-dunes module with the scaled-dune-detail module.
Source0 = new Add
{
// [Scaled-sand-dunes module]: This scale/bias module shrinks the dune
// heights by a small amount. This is necessary so that the subsequent
// noise modules in this subgroup can add some detail to the dunes.
Source0 = new ScaleBias
{
Scale = 0.875,
Bias = 0,
// [Sand-dunes module]: This ridged-multifractal-noise module generates
// sand dunes. This ridged-multifractal noise is generated with a single
// octave, which makes very smooth dunes.
Source0 = new RidgedMulti
{
Seed = Settings.Seed + 80,
Frequency = 6163.5,
Lacunarity = Settings.BadlandsLacunarity,
Quality = NoiseQuality.Best,
OctaveCount = 1,
},
},
// [Scaled-dune-detail module]: This scale/bias module shrinks the dune
// details by a large amount. This is necessary so that the subsequent
// noise modules in this subgroup can add this detail to the sand-dunes
// module.
Source1 = new ScaleBias
{
Scale = 0.25,
Bias = 0.25,
// [Dune-detail module]: This noise module uses Voronoi polygons to
// generate the detail to add to the dunes. By enabling the distance
// algorithm, small polygonal pits are generated; the edges of the pits
// are joined to the edges of nearby pits.
Source0 = new Voronoi
{
Seed = Settings.Seed + 81,
Frequency = 16183.25,
Displacement = 0,
EnableDistance = true,
},
},
},
};
// Generates the cliffs for the badlands.
//
// -1.0 represents the lowest elevations and +1.0 represents the highest
// elevations.
//
// [Badlands-cliffs subgroup]: Caches the output value from the warped-
// cliffs module.
var badlandsCliffs = new Cache
{
// [Warped-cliffs module]: This turbulence module warps the output value
// from the coarse-turbulence module. This turbulence has a higher
// frequency, but lower power, than the coarse-turbulence module, adding
// some fine detail to it.
Source0 = new Turbulence
{
Seed = Settings.Seed + 92,
Frequency = 36107,
Power = 1.0 / 211543.0 * Settings.BadlandsTwist,
Roughness = 3,
// [Coarse-turbulence module]: This turbulence module warps the output
// value from the terraced-cliffs module, adding some coarse detail to
// it.
Source0 = new Turbulence
{
Seed = Settings.Seed + 91,
Frequency = 16111,
Power = 1.0 / 141539.0 * Settings.BadlandsTwist,
Roughness = 3,
// [Terraced-cliffs module]: Next, this terracing module applies some
// terraces to the clamped-cliffs module in the lower elevations before
// the sharp cliff transition.
Source0 = new Terrace
{
ControlPoints = new List<double>
{
-1.0000,
-0.8750,
-0.7500,
-0.5000,
0.0000,
1.0000,
},
// [Clamped-cliffs module]: This clamping module makes the tops of the
// cliffs very flat by clamping the output value from the cliff-shaping
// module so that the tops of the cliffs are very flat.
Source0 = new Clamp
{
LowerBound = -999.125,
UpperBound = 0.875,
// [Cliff-shaping module]: Next, this curve module applies a curve to the
// output value from the cliff-basis module. This curve is initially
// very shallow, but then its slope increases sharply. At the highest
// elevations, the curve becomes very flat again. This produces the
// stereotypical Utah-style desert cliffs.
Source0 = new Curve
{
ControlPoints = new List<Curve.ControlPoint>
{
new Curve.ControlPoint(-2.0000, -2.0000),
new Curve.ControlPoint(-1.0000, -1.2500),
new Curve.ControlPoint(-0.0000, -0.7500),
new Curve.ControlPoint( 0.5000, -0.2500),
new Curve.ControlPoint( 0.6250, 0.8750),
new Curve.ControlPoint( 0.7500, 1.0000),
new Curve.ControlPoint( 2.0000, 1.2500),
},
// [Cliff-basis module]: This Perlin-noise module generates some coherent
// noise that will be used to generate the cliffs.
Source0 = new Perlin
{
Seed = Settings.Seed + 90,
Frequency = Settings.ContinentFrequency * 839,
Persistence = 0.5,
Lacunarity = Settings.BadlandsLacunarity,
OctaveCount = 6,
Quality = NoiseQuality.Standard,
},
},
},
},
},
},
};
//Generates the final badlands terrain.
//
// Using a scale/bias module, the badlands sand is flattened considerably,
// then the sand elevations are lowered to around -1.0. The maximum value
// from the flattened sand module and the cliff module contributes to the
// final elevation. This causes sand to appear at the low elevations since
// the sand is slightly higher than the cliff base.
//
// -1.0 represents the lowest elevations and +1.0 represents the highest
// elevations.
//
// [Badlands-terrain group]: Caches the output value from the dunes-and-
// cliffs module. This is the output value for the entire badlands-
// terrain group.
var badlandsTerrain = new Cache
{
// [Dunes-and-cliffs module]: This maximum-value module causes the dunes
// to appear in the low areas and the cliffs to appear in the high areas.
// It does this by selecting the maximum of the output values from the
// scaled-sand-dunes module and the badlands-cliffs subgroup.
Source0 = new Max
{
Source0 = badlandsCliffs,
// [Scaled-sand-dunes module]: This scale/bias module considerably
// flattens the output value from the badlands-sands subgroup and lowers
// this value to near -1.0.
Source1 = new ScaleBias
{
Scale = 0.25,
Bias = -0.75,
Source0 = badlandsSand,
},
},
};
return badlandsTerrain;
}
Module CreateFinalPlanet(Module continentDefinition, Module terrainTypeDefinition,
Module scaledPlainsTerrain, Module scaledHillyTerrain, Module scaledMountainousTerrain,
Module scaledBadlandsTerrain, Module riverPositions)
{
// Creates the continental shelves.
//
// The output value from this module subgroup are measured in planetary
// elevation units (-1.0 for the lowest underwater trenches and +1.0 for the
// highest mountain peaks.)
//
// [Continental-shelf subgroup]: Caches the output value from the shelf-
// and-trenches module.
var continentalShelf = new Cache
{
// [Shelf-and-trenches module]: This addition module adds the oceanic
// trenches to the clamped-sea-bottom module.
Source0 = new Add
{
// [Oceanic-trench module]: This scale/bias module inverts the ridges
// from the oceanic-trench-basis-module so that the ridges become
// trenches. This noise module also reduces the depth of the trenches so
// that their depths are measured in planetary elevation units.
Source0 = new ScaleBias
{
Scale = -0.125,
Bias = -0.125,
// [Shelf-creator module]: This terracing module applies a terracing
// curve to the continent-definition group at the specified shelf level.
// This terrace becomes the continental shelf. Note that this terracing
// module also places another terrace below the continental shelf near
// -1.0. The bottom of this terrace is defined as the bottom of the
// ocean; subsequent noise modules will later add oceanic trenches to the
// bottom of the ocean.
Source0 = new Terrace
{
ControlPoints = new List<double>
{
-1.0,
-0.75,
Settings.ShelfLevel,
1.0,
},
Source0 = continentDefinition,
},
},
// [Clamped-sea-bottom module]: This clamping module clamps the output
// value from the shelf-creator module so that its possible range is
// from the bottom of the ocean to sea level. This is done because this
// subgroup is only concerned about the oceans.
Source1 = new Clamp
{
LowerBound = -0.75,
UpperBound = Settings.SeaLevel,
// [Oceanic-trench-basis module]: This ridged-multifractal-noise module
// generates some coherent noise that will be used to generate the
// oceanic trenches. The ridges represent the bottom of the trenches.
Source0 = new RidgedMulti
{
Seed = Settings.Seed + 130,
Frequency = Settings.ContinentFrequency * 4.375,
Lacunarity = Settings.ContinentLacunarity,
OctaveCount = 16,
Quality = NoiseQuality.Best,
}
},
}
};
// Generates the base elevations for the continents, before
// terrain features are added.
//
// The output value from this module subgroup is measured in planetary
// elevation units (-1.0 for the lowest underwater trenches and +1.0 for the
// highest mountain peaks.)
//
// [Base-continent-elevation subgroup]: Caches the output value from the
// base-continent-with-oceans module.
var baseContinentElevation = new Cache
{
// [Base-continent-with-oceans module]: This selector module applies the
// elevations of the continental shelves to the base elevations of the
// continent. It does this by selecting the output value from the
// continental-shelf subgroup if the corresponding output value from the
// continent-definition group is below the shelf level. Otherwise, it
// selects the output value from the base-scaled-continent-elevations
// module.
Source0 = new Select
{
LowerBound = Settings.ShelfLevel - 1000,
UpperBound = Settings.ShelfLevel,
EdgeFalloff = 0.03125,
// [Base-scaled-continent-elevations module]: This scale/bias module
// scales the output value from the continent-definition group so that it
// is measured in planetary elevation units
Source0 = new ScaleBias
{
Scale = Settings.ContinentHeightScale,
Bias = 0,
Source0 = continentDefinition,
},
Source1 = continentalShelf,
Control = continentDefinition,
}
};
// Applies the scaled-plains-terrain group to the base-
// continent-elevation subgroup.
//
// The output value from this module subgroup is measured in planetary
// elevation units (-1.0 for the lowest underwater trenches and +1.0 for the
// highest mountain peaks.)
//
// [Continents-with-plains subgroup]: Caches the output value from the
// continents-with-plains module.
var continentsWithPlains = new Cache
{
// [Continents-with-plains module]: This addition module adds the
// scaled-plains-terrain group to the base-continent-elevation subgroup.
Source0 = new Add
{
Source0 = baseContinentElevation,
Source1 = scaledPlainsTerrain,
},
};
// Applies the scaled-hilly-terrain group to the continents-
// with-plains subgroup.
//
// The output value from this module subgroup is measured in planetary
// elevation units (-1.0 for the lowest underwater trenches and +1.0 for the
// highest mountain peaks.)
//
// [Continents-with-hills subgroup]: Caches the output value from the
// select-high-elevations module.
var continentsWithHills = new Cache
{
// [Select-high-elevations module]: This selector module ensures that
// the hills only appear at higher elevations. It does this by selecting
// the output value from the continent-with-hills module if the
// corresponding output value from the terrain-type-defintion group is
// above a certain value. Otherwise, it selects the output value from the
// continents-with-plains subgroup.
Source0 = new Select
{
LowerBound = 1 - Settings.HillsAmount,
UpperBound = 1001 - Settings.HillsAmount,
EdgeFalloff = 0.25,
Source0 = continentsWithPlains,
// [Continents-with-hills module]: This addition module adds the scaled-
// hilly-terrain group to the base-continent-elevation subgroup.
Source1 = new Add
{
Source0 = baseContinentElevation,
Source1 = scaledHillyTerrain,
},
Control = terrainTypeDefinition,
},
};
// Applies the scaled-mountainous-terrain group to the
// continents-with-hills subgroup.
//
// The output value from this module subgroup is measured in planetary
// elevation units (-1.0 for the lowest underwater trenches and +1.0 for the
// highest mountain peaks.)
//
// [Continents-with-mountains subgroup]: Caches the output value from
// the select-high-elevations module.
var continentsWithMountains = new Cache
{
// [Select-high-elevations module]: This selector module ensures that
// mountains only appear at higher elevations. It does this by selecting
// the output value from the continent-with-mountains module if the
// corresponding output value from the terrain-type-defintion group is
// above a certain value. Otherwise, it selects the output value from
// the continents-with-hills subgroup. Note that the continents-with-
// hills subgroup also contains the plains terrain.
Source0 = new Select
{
LowerBound = 1 - Settings.MountainsAmount,
UpperBound = 1001 - Settings.MountainsAmount,
EdgeFalloff = 0.25,
Source0 = continentsWithHills,
// [Add-increased-mountain-heights module]: This addition module adds
// the increased-mountain-heights module to the continents-and-
// mountains module. The highest continent elevations now have the
// highest mountains.
Source1 = new Add
{
// [Continents-and-mountains module]: This addition module adds the
// scaled-mountainous-terrain group to the base-continent-elevation
// subgroup.
Source0 = new Add
{
Source0 = baseContinentElevation,
Source1 = scaledMountainousTerrain,
},
// [Increase-mountain-heights module]: This curve module applies a curve
// to the output value from the continent-definition group. This
// modified output value is used by a subsequent noise module to add
// additional height to the mountains based on the current continent
// elevation. The higher the continent elevation, the higher the
// mountains.
Source1 = new Curve
{
ControlPoints = new List<Curve.ControlPoint>
{
new Curve.ControlPoint (-1.0, -0.0625),
new Curve.ControlPoint ( 0.0, 0.0000),
new Curve.ControlPoint ( 1.0 - Settings.MountainsAmount, 0.0625),
new Curve.ControlPoint ( 1.0, 0.2500),
},
Source0 = continentDefinition,
},
},
Control = terrainTypeDefinition,
},
};
// Applies the scaled-badlands-terrain group to the
// continents-with-mountains subgroup.
//
// The output value from this module subgroup is measured in planetary
// elevation units (-1.0 for the lowest underwater trenches and +1.0 for the
// highest mountain peaks.)
//
// [Continents-with-badlands subgroup]: Caches the output value from the
// apply-badlands module.
var continentsWithBadlands = new Cache
{
// [Apply-badlands module]: This maximum-value module causes the badlands
// to "poke out" from the rest of the terrain. It does this by ensuring
// that only the maximum of the output values from the continents-with-
// mountains subgroup and the select-badlands-positions modules
// contribute to the output value of this subgroup. One side effect of
// this process is that the badlands will not appear in mountainous
// terrain.
Source0 = new Max
{
Source0 = continentsWithMountains,
// [Select-badlands-positions module]: This selector module places
// badlands at random spots on the continents based on the Perlin noise
// generated by the badlands-positions module. To do this, it selects
// the output value from the continents-and-badlands module if the
// corresponding output value from the badlands-position module is
// greater than a specified value. Otherwise, this selector module
// selects the output value from the continents-with-mountains subgroup.
// There is also a wide transition between these two noise modules so
// that the badlands can blend into the rest of the terrain on the
// continents.
Source1 = new Select
{
LowerBound = 1 - Settings.BadlandsAmount,
UpperBound = 1001 - Settings.BadlandsAmount,
EdgeFalloff = 0.25,
Source0 = continentsWithMountains,
// [Continents-and-badlands module]: This addition module adds the
// scaled-badlands-terrain group to the base-continent-elevation
// subgroup.
Source1 = new Add
{
Source0 = baseContinentElevation,
Source1 = scaledBadlandsTerrain,
},
// [Badlands-positions module]: This Perlin-noise module generates some
// random noise, which is used by subsequent noise modules to specify the
// locations of the badlands.
Control = new Perlin
{
Seed = Settings.Seed + 140,
Frequency = 16.5,
Persistence = 0.5,
Lacunarity = Settings.ContinentLacunarity,
OctaveCount = 2,
Quality = NoiseQuality.Standard,
},
},
},
};
// Applies the river-positions group to the continents-with-
// badlands subgroup.
//
// The output value from this module subgroup is measured in planetary
// elevation units (-1.0 for the lowest underwater trenches and +1.0 for the
// highest mountain peaks.)
//
// [Continents-with-rivers subgroup]: Caches the output value from the
// blended-rivers-to-continents module.
var continentsWithRivers = new Cache
{
// [Blended-rivers-to-continents module]: This selector module outputs
// deep rivers near sea level and shallower rivers in higher terrain. It
// does this by selecting the output value from the continents-with-
// badlands subgroup if the corresponding output value from the
// continents-with-badlands subgroup is far from sea level. Otherwise,
// this selector module selects the output value from the add-rivers-to-
// continents module.
Source0 = new Select
{
LowerBound = Settings.SeaLevel,
UpperBound = Settings.ContinentHeightScale + Settings.SeaLevel,
EdgeFalloff = Settings.ContinentHeightScale = Settings.SeaLevel,
Source0 = continentsWithBadlands,
// [Add-rivers-to-continents module]: This addition module adds the
// rivers to the continents-with-badlands subgroup. Because the scaled-
// rivers module only outputs a negative value, the scaled-rivers module
// carves the rivers out of the terrain.
Source1 = new Add
{
Source0 = continentsWithBadlands,
// [Scaled-rivers module]: This scale/bias module scales the output value
// from the river-positions group so that it is measured in planetary
// elevation units and is negative; this is required for Add-rivers-to-continents.
Source1 = new ScaleBias
{
Scale = Settings.RiverDepth / 2.0,
Bias = -Settings.RiverDepth / 2.0,
Source0 = riverPositions,
},
},
Control = continentsWithBadlands,
},
};
// Simply caches the output value from the continent-with-
// rivers subgroup to contribute to the final output value.
//
// [Unscaled-final-planet subgroup]: Caches the output value from the
// continent-with-rivers subgroup.
var unscaledFinalPlanet = new Cache
{
Source0 = continentsWithRivers,
};
// Scales the output value from the unscaled-final-planet
// subgroup so that it represents an elevation in meters.
//
// 2: [Final-planet group]: Caches the output value from the final-planet-
// in-meters module.
var finalPlanet = new Cache
{
// [Final-planet-in-meters module]: This scale/bias module scales the
// output value from the unscaled-final-planet subgroup so that its
// output value is measured in meters.
Source0 = new ScaleBias
{
Scale = (Settings.MaxElev - Settings.MinElev) / 2.0,
Bias = Settings.MinElev + ((Settings.MaxElev - Settings.MinElev) / 2.0),
Source0 = unscaledFinalPlanet,
},
};
return finalPlanet;
}
Module CreateContinentDefinition()
{
// Roughly defines the positions and base elevations of the planet's continents.
//
// The "base elevation" is the elevation of the terrain before any terrain
// features (mountains, hills, etc.) are placed on that terrain.
//
// -1.0 represents the lowest elevations and +1.0 represents the highest
// elevations.
//
// [Base-continent-definition subgroup]: Caches the output value from the
// clamped-continent module.
var baseContinent = new Cache
{
// [Clamped-continent module]: Finally, a clamp module modifies the
// carved-continent module to ensure that the output value of this
// subgroup is between -1.0 and 1.0.
Source0 = new Clamp
{
LowerBound = -1,
UpperBound = 1,
// [Carved-continent module]: This minimum-value module carves out chunks
// from the continent-with-ranges module. It does this by ensuring that
// only the minimum of the output values from the scaled-carver module
// and the continent-with-ranges module contributes to the output value
// of this subgroup. Most of the time, the minimum-value module will
// select the output value from the continents-with-ranges module since
// the output value from the scaled-carver module is usually near 1.0.
// Occasionally, the output value from the scaled-carver module will be
// less than the output value from the continent-with-ranges module, so
// in this case, the output value from the scaled-carver module is
// selected.
Source0 = new Min
{
// [Scaled-carver module]: This scale/bias module scales the output
// value from the carver module such that it is usually near 1.0. This
// is required for step 5.
Source0 = new ScaleBias
{
Scale = 0.375,
Bias = 0.625,
// [Carver module]: This higher-frequency Perlin-noise module will be
// used by subsequent noise modules to carve out chunks from the mountain
// ranges within the continent-with-ranges module so that the mountain
// ranges will not be complely impassible.
Source0 = new Perlin
{
Seed = Settings.Seed + 1,
Frequency = Settings.ContinentFrequency * 4.34375,
Persistence = 0.5,
Lacunarity = Settings.ContinentLacunarity,
OctaveCount = 11,
Quality = NoiseQuality.Standard,
},
},
// [Continent-with-ranges module]: Next, a curve module modifies the
// output value from the continent module so that very high values appear
// near sea level. This defines the positions of the mountain ranges.
Source1 = new Curve
{
ControlPoints = new List<Curve.ControlPoint>
{
new Curve.ControlPoint(-2.0000 + Settings.SeaLevel, -1.625 + Settings.SeaLevel),
new Curve.ControlPoint(-1.0000 + Settings.SeaLevel, -1.375 + Settings.SeaLevel),
new Curve.ControlPoint( 0.0000 + Settings.SeaLevel, -0.375 + Settings.SeaLevel),
new Curve.ControlPoint( 0.0625 + Settings.SeaLevel, 0.125 + Settings.SeaLevel),
new Curve.ControlPoint( 0.1250 + Settings.SeaLevel, 0.250 + Settings.SeaLevel),
new Curve.ControlPoint( 0.2500 + Settings.SeaLevel, 1.000 + Settings.SeaLevel),
new Curve.ControlPoint( 0.5000 + Settings.SeaLevel, 0.250 + Settings.SeaLevel),
new Curve.ControlPoint( 0.7500 + Settings.SeaLevel, 0.250 + Settings.SeaLevel),
new Curve.ControlPoint( 1.0000 + Settings.SeaLevel, 0.500 + Settings.SeaLevel),
new Curve.ControlPoint( 2.0000 + Settings.SeaLevel, 0.500 + Settings.SeaLevel),
},
// [Continent module]: This Perlin-noise module generates the continents.
// This noise module has a high number of octaves so that detail is
// visible at high zoom levels.
Source0 = new Perlin
{
Seed = Settings.Seed + 0,
Frequency = Settings.ContinentFrequency,
Persistence = 0.5,
Lacunarity = Settings.ContinentLacunarity,
OctaveCount = 14,
Quality = NoiseQuality.Standard,
},
},
},
},
};
// Warps the output value from the the base-continent-
// definition module, producing more realistic terrain.
//
// Warping the base continent definition produces lumpier terrain with
// cliffs and rifts.
//
// -1.0 represents the lowest elevations and +1.0 represents the highest
// elevations.
//
// [Continent-definition group]: Caches the output value from the
// clamped-continent module. This is the output value for the entire
// continent-definition group.
var continentDefinition = new Cache
{
// [Select-turbulence module]: At this stage, the turbulence is applied
// to the entire base-continent-definition subgroup, producing some very
// rugged, unrealistic coastlines. This selector module selects the
// output values from the (unwarped) base-continent-definition subgroup
// and the warped-base-continent-definition module, based on the output
// value from the (unwarped) base-continent-definition subgroup. The
// selection boundary is near sea level and has a relatively smooth
// transition. In effect, only the higher areas of the base-continent-
// definition subgroup become warped; the underwater and coastal areas
// remain unaffected.
Source0 = new Select
{
EdgeFalloff = 0.0625,
LowerBound = Settings.SeaLevel - 0.0375,
UpperBound = Settings.SeaLevel + 1000.0375,
Control = baseContinent,
Source0 = baseContinent,
// [Warped-base-continent-definition module]: This turbulence module
// warps the output value from the intermediate-turbulence module. This
// turbulence has a higher frequency, but lower power, than the
// intermediate-turbulence module, adding some fine detail to it.
Source1 = new Turbulence
{
Seed = Settings.Seed + 12,
Frequency = Settings.ContinentFrequency * 95.25,
Power = Settings.ContinentFrequency / 1019.75,
Roughness = 11,
// [Intermediate-turbulence module]: This turbulence module warps the
// output value from the coarse-turbulence module. This turbulence has
// a higher frequency, but lower power, than the coarse-turbulence
// module, adding some intermediate detail to it.
Source0 = new Turbulence
{
Seed = Settings.Seed + 11,
Frequency = Settings.ContinentFrequency * 47.25,
Power = Settings.ContinentFrequency / 433.75,
Roughness = 12,
// [Coarse-turbulence module]: This turbulence module warps the output
// value from the base-continent-definition subgroup, adding some coarse
// detail to it.
Source0 = new Turbulence
{
Seed = Settings.Seed + 10,
Frequency = Settings.ContinentFrequency * 15.25,
Power = Settings.ContinentFrequency / 113.75,
Roughness = 12,
Source0 = baseContinent,
},
},
},
},
};
return continentDefinition;
}
Module CreateTerrainTypeDefinition(Module continentDefinition)
{
// Defines the positions of the terrain types on the planet.
//
// Terrain types include, in order of increasing roughness, plains, hills,
// and mountains.
//
// This subgroup's output value is based on the output value from the
// continent-definition group. Rougher terrain mainly appears at higher
// elevations.
//
// -1.0 represents the smoothest terrain types (plains and underwater) and
// +1.0 represents the roughest terrain types (mountains).
//
// [Terrain-type-definition group]: Caches the output value from the
// roughness-probability-shift module. This is the output value for
// the entire terrain-type-definition group.
var terrainTypeDefinition = new Cache
{
// [Roughness-probability-shift module]: This terracing module sharpens
// the edges of the warped-continent module near sea level and lowers
// the slope towards the higher-elevation areas. This shrinks the areas
// in which the rough terrain appears, increasing the "rarity" of rough
// terrain.
Source0 = new Terrace
{
ControlPoints = new List<double>
{
-1,
Settings.ShelfLevel + Settings.SeaLevel / 2.0,
1,
},
// [Warped-continent module]: This turbulence module slightly warps the
// output value from the continent-definition group. This prevents the
// rougher terrain from appearing exclusively at higher elevations.
// Rough areas may now appear in the the ocean, creating rocky islands
// and fjords.
Source0 = new Turbulence
{
Seed = Settings.Seed + 20,
Frequency = Settings.ContinentFrequency * 18.125,
Power = Settings.ContinentFrequency / 20.59375 * Settings.TerrainOffset,
Roughness = 3,
Source0 = continentDefinition,
},
},
};
return terrainTypeDefinition;
}
Module CreateScaledPlainsTerrain(Module plainsTerrain)
{
// Scales the output value from the plains-terrain group so
// that it can be added to the elevations defined by the continent-
// definition group.
//
// This subgroup scales the output value such that it is almost always
// positive. This is done so that negative elevations are not applied to
// the continent-definition group, preventing parts of the continent-
// definition group from having negative terrain features "stamped" into it.
//
// The output value from this module subgroup is measured in planetary
// elevation units (-1.0 for the lowest underwater trenches and +1.0 for the
// highest mountain peaks.)
//
// [Scaled-plains-terrain group]: Caches the output value from the
// scaled-plains-terrain module. This is the output value for the entire
// scaled-plains-terrain group.
var scaledPlainsTerrain = new Cache
{
// [Scaled-plains-terrain module]: This scale/bias module greatly
// flattens the output value from the plains terrain. This output value
// is measured in planetary elevation units
Source0 = new ScaleBias
{
Scale = 0.00390625,
Bias = 0.0078125,
Source0 = plainsTerrain,
},
};
return scaledPlainsTerrain;
}
Module CreateScaledMountainousTerrain(Module mountainousTerrain)
{
// Scales the output value from the mountainous-terrain group
// so that it can be added to the elevation defined by the continent-
// definition group.
//
// This subgroup scales the output value such that it is almost always
// positive. This is done so that a negative elevation does not get applied
// to the continent-definition group, preventing parts of that group from
// having negative terrain features "stamped" into it.
//
// The output value from this module subgroup is measured in planetary
// elevation units (-1.0 for the lowest underwater trenches and +1.0 for the
// highest mountain peaks.)
//
// [Scaled-mountainous-terrain group]: Caches the output value from the
// peak-height-multiplier module. This is the output value for the
// entire scaled-mountainous-terrain group.
var scaledMountainousTerrain = new Cache
{
// [Peak-height-multiplier module]: This multiplier module modulates the
// heights of the mountain peaks from the base-scaled-mountainous-terrain
// module using the output value from the scaled-peak-modulation module.
Source0 = new Multiply
{
// [Base-scaled-mountainous-terrain module]: This scale/bias module
// scales the output value from the mountainous-terrain group so that the
// output value is measured in planetary elevation units.
Source0 = new ScaleBias
{
Scale = 0.125,
Bias = 0.125,
Source0 = mountainousTerrain,
},
// [Scaled-peak-modulation module]: This scale/bias module modifies the
// range of the output value from the peak-modulation module so that it
// can be used as the modulator for the peak-height-multiplier module.
// It is important that this output value is not much lower than 1.0.
Source1 = new ScaleBias
{
Scale = 0.25,
Bias = 1,
// [Peak-modulation module]: This exponential-curve module applies an
// exponential curve to the output value from the base-peak-modulation
// module. This produces a small number of high values and a much larger
// number of low values. This means there will be a few peaks with much
// higher elevations than the majority of the peaks, making the terrain
// features more varied.
Source0 = new Exponent
{
Exp = 1.25,
// [Base-peak-modulation module]: At this stage, most mountain peaks have
// roughly the same elevation. This Perlin-noise module generates some
// random values that will be used by subsequent noise modules to
// randomly change the elevations of the mountain peaks.
Source0 = new Perlin
{
Seed = Settings.Seed + 110,
Frequency = 14.5,
Persistence = 0.5,
Lacunarity = Settings.MountainLacunarity,
OctaveCount = 6,
Quality = NoiseQuality.Standard,
},
},
},
},
};
return scaledMountainousTerrain;
}
Module CreateRiverPositions()
{
// Generates the river positions.
//
// -1.0 represents the lowest elevations and +1.0 represents the highest
// elevations.
//
// [River-positions group]: Caches the output value from the warped-
// rivers module. This is the output value for the entire river-
// positions group.
var riverPositions = new Cache
{
// [Warped-rivers module]: This turbulence module warps the output value
// from the combined-rivers module, which twists the rivers. The high
// roughness produces less-smooth rivers.
Source0 = new Turbulence
{
Seed = Settings.Seed + 102,
Frequency = 9.25,
Power = 1.0 / 57.75,
Roughness = 6,
// [Combined-rivers module]: This minimum-value module causes the small
// rivers to cut into the large rivers. It does this by selecting the
// minimum output values from the large-river-curve module and the small-
// river-curve module.
Source0 = new Min
{
// [Large-river-curve module]: This curve module applies a curve to the
// output value from the large-river-basis module so that the ridges
// become inverted. This creates the rivers. This curve also compresses
// the edge of the rivers, producing a sharp transition from the land to
// the river bottom.
Source0 = new Curve
{
ControlPoints = new List<Curve.ControlPoint>
{
new Curve.ControlPoint(-2.000, 2.000),
new Curve.ControlPoint(-1.000, 1.000),
new Curve.ControlPoint(-0.125, 0.875),
new Curve.ControlPoint( 0.000, -1.000),
new Curve.ControlPoint( 1.000, -1.500),
new Curve.ControlPoint( 2.000, -2.000),
},
// [Large-river-basis module]: This ridged-multifractal-noise module
// creates the large, deep rivers.
Source0 = new RidgedMulti
{
Seed = Settings.Seed + 100,
Frequency = 18.75,
Lacunarity = Settings.ContinentLacunarity,
OctaveCount = 1,
Quality = NoiseQuality.Best,
},
},
// [Small-river-curve module]: This curve module applies a curve to the
// output value from the small-river-basis module so that the ridges
// become inverted. This creates the rivers. This curve also compresses
// the edge of the rivers, producing a sharp transition from the land to
// the river bottom.
Source1 = new Curve
{
ControlPoints = new List<Curve.ControlPoint>
{
new Curve.ControlPoint(-2.000, 2.0000),
new Curve.ControlPoint(-1.000, 1.5000),
new Curve.ControlPoint(-0.125, 1.4375),
new Curve.ControlPoint( 0.000, 0.5000),
new Curve.ControlPoint( 1.000, 0.2500),
new Curve.ControlPoint( 2.000, 0.0000),
},
// [Small-river-basis module]: This ridged-multifractal-noise module
// creates the small, shallow rivers.
Source0 = new RidgedMulti
{
Seed = Settings.Seed + 101,
Frequency = 43.25,
Lacunarity = Settings.ContinentLacunarity,
OctaveCount = 1,
Quality = NoiseQuality.Best,
},
},
},
},
};
return riverPositions;
}
Module CreatePlainsTerrain()
{
// Generates the plains terrain.
//
// Because this subgroup will eventually be flattened considerably, the
// types and combinations of noise modules that generate the plains are not
// really that important; they only need to "look" interesting.
//
// -1.0 represents the lowest elevations and +1.0 represents the highest
// elevations.
//
// [Plains-terrain group]: Caches the output value from the rescaled-
// plains-basis module. This is the output value for the entire plains-
// terrain group.
var plainsTerrain = new Cache
{
// [Rescaled-plains-basis module]: This scale/bias module maps the output
// value that ranges from 0.0 to 1.0 back to a value that ranges from
// -1.0 to +1.0.
Source0 = new ScaleBias
{
Scale = 2,
Bias = -1,
Source0 = new Multiply
{
// [Positive-plains-basis-0 module]: This scale/bias module makes the
// output value from the plains-basis-0 module positive since this output
// value will be multiplied together with the positive-plains-basis-1
// module.
Source0 = new ScaleBias
{
Scale = 0.5,
Bias = 0.5,
// [Plains-basis-0 module]: This billow-noise module, along with the
// plains-basis-1 module, produces the plains.
Source0 = new Billow
{
Seed = Settings.Seed + 70,
Frequency = 1097.5,
Persistence = 0.5,
Lacunarity = Settings.PlainsLacunarity,
OctaveCount = 8,
Quality = NoiseQuality.Best,
},
},
// [Positive-plains-basis-1 module]: This scale/bias module makes the
// output value from the plains-basis-1 module positive since this output
// value will be multiplied together with the positive-plains-basis-0
// module.
Source1 = new ScaleBias
{
Scale = 0.5,
Bias = 0.5,
// [Plains-basis-1 module]: This billow-noise module, along with the
// plains-basis-2 module, produces the plains.
Source0 = new Billow
{
Seed = Settings.Seed + 71,
Frequency = 1319.5,
Persistence = 0.5,
Lacunarity = Settings.PlainsLacunarity,
OctaveCount = 8,
Quality = NoiseQuality.Best,
},
},
},
},
};
return plainsTerrain;
}