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GeoSphereStyle.cpp
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GeoSphereStyle.cpp
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#include "GeoSphereStyle.h"
#include "perlin.h"
/**
* All these stinking octavenoise functions return range [0,1] if roughness = 0.5
*/
static inline double octavenoise(fracdef_t &def, double roughness, const vector3d &p);
static inline double river_octavenoise(fracdef_t &def, double roughness, const vector3d &p);
static inline double ridged_octavenoise(fracdef_t &def, double roughness, const vector3d &p);
static inline double billow_octavenoise(fracdef_t &def, double roughness, const vector3d &p);
static inline double voronoiscam_octavenoise(fracdef_t &def, double roughness, const vector3d &p);
static inline double dunes_octavenoise(fracdef_t &def, double roughness, const vector3d &p);
//static inline double dunes_octavenoise(int octaves, double roughness, double lacunarity, const vector3d &p);
static double canyon_ridged_function(const fracdef_t &def, const vector3d &p);
static double canyon2_ridged_function(const fracdef_t &def, const vector3d &p);
static double canyon3_ridged_function(const fracdef_t &def, const vector3d &p);
static double canyon_normal_function(const fracdef_t &def, const vector3d &p);
static double canyon2_normal_function(const fracdef_t &def, const vector3d &p);
static double canyon3_normal_function(const fracdef_t &def, const vector3d &p);
static double canyon_voronoi_function(const fracdef_t &def, const vector3d &p);
static double canyon2_voronoi_function(const fracdef_t &def, const vector3d &p);
static double canyon3_voronoi_function(const fracdef_t &def, const vector3d &p);
static double canyon_billow_function(const fracdef_t &def, const vector3d &p);
static double canyon2_billow_function(const fracdef_t &def, const vector3d &p);
static double canyon3_billow_function(const fracdef_t &def, const vector3d &p);
static double crater_function(const fracdef_t &def, const vector3d &p);
static double impact_crater_function(const fracdef_t &def, const vector3d &p);
static double volcano_function(const fracdef_t &def, const vector3d &p);
static double megavolcano_function(const fracdef_t &def, const vector3d &p);
static double river_function(const fracdef_t &def, const vector3d &p);
static double river2_function(const fracdef_t &def, const vector3d &p);
static double cliff_function(const fracdef_t &def, const vector3d &p);
int GeoSphereStyle::GetRawHeightMapVal(int x, int y)
{
return m_heightMap[Clamp(y, 0, m_heightMapSizeY-1)*m_heightMapSizeX + Clamp(x, 0, m_heightMapSizeX-1)];
}
/*
* Bicubic interpolation!!!
*/
double GeoSphereStyle::GetHeightMapVal(const vector3d &pt)
{ // This is all used for Earth and Earth alone
double latitude = -asin(pt.y);
if (pt.y < -1.0) latitude = -0.5*M_PI;
if (pt.y > 1.0) latitude = 0.5*M_PI;
// if (!isfinite(latitude)) {
// // pt.y is just n of asin domain [-1,1]
// latitude = (pt.y < 0 ? -0.5*M_PI : M_PI*0.5);
// }
double longitude = atan2(pt.x, pt.z);
double px = (((m_heightMapSizeX-1) * (longitude + M_PI)) / (2*M_PI));
double py = ((m_heightMapSizeY-1)*(latitude + 0.5*M_PI)) / M_PI;
int ix = floor(px);
int iy = floor(py);
ix = Clamp(ix, 0, m_heightMapSizeX-1);
iy = Clamp(iy, 0, m_heightMapSizeY-1);
double dx = px-ix;
double dy = py-iy;
// p0,3 p1,3 p2,3 p3,3
// p0,2 p1,2 p2,2 p3,2
// p0,1 p1,1 p2,1 p3,1
// p0,0 p1,0 p2,0 p3,0
double p[4][4];
for (int x=-1; x<3; x++) {
for (int y=-1; y<3; y++) {
p[1+x][1+y] = GetRawHeightMapVal(ix+x, iy+y);
}
}
double c[4];
for (int j=0; j<4; j++) {
double d0 = p[0][j] - p[1][j];
double d2 = p[2][j] - p[1][j];
double d3 = p[3][j] - p[1][j];
double a0 = p[1][j];
double a1 = -(1/3.0)*d0 + d2 - (1/6.0)*d3;
double a2 = 0.5*d0 + 0.5*d2;
double a3 = -(1/6.0)*d0 - 0.5*d2 + (1/6.0)*d3;
c[j] = a0 + a1*dx + a2*dx*dx + a3*dx*dx*dx;
}
{
double d0 = c[0] - c[1];
double d2 = c[2] - c[1];
double d3 = c[3] - c[1];
double a0 = c[1];
double a1 = -(1/3.0)*d0 + d2 - (1/6.0)*d3;
double a2 = 0.5*d0 + 0.5*d2;
double a3 = -(1/6.0)*d0 - 0.5*d2 + (1/6.0)*d3;
double v = a0 + a1*dy + a2*dy*dy + a3*dy*dy*dy;
v = (v<0 ? 0 : v);
double h = v;
//Here's where we add some noise over the heightmap so it doesnt look so boring, we scale by height so values are greater high up
//large mountainous shapes
v += h*h*0.0005*m_fracdef[5].amplitude*ridged_octavenoise(m_fracdef[0], 0.5, pt);
//smaller ridged mountains
v += h*h*0.0002*m_fracdef[5].amplitude*m_fracdef[0].amplitude*octavenoise(m_fracdef[4], 0.5, pt);
//high altitude detail/mountains
v += Clamp(h, 0.0, 0.5)*octavenoise(m_fracdef[2], 0.5, pt);
//low altitude detail/dunes
v += h*0.000003*ridged_octavenoise(m_fracdef[2], Clamp(1.0-h*0.002, 0.0, 0.5), pt);
if (v < 2.0){
v += 10.0*v*dunes_octavenoise(m_fracdef[3], 0.5, pt);
} else if (v <10.0){
v += 20.0*dunes_octavenoise(m_fracdef[3], 0.5, pt);
} else {
v += (10.0/v)*(10.0/v)*(10.0/v)*(10.0/v)*(10.0/v)*
20.0*dunes_octavenoise(m_fracdef[3], 0.5, pt);
}
if (v<40.0) {
//v = v;
} else if (v <60.0){
v += (v-40.0)*billow_octavenoise(m_fracdef[4], 0.5, pt);
//printf("V/height: %f\n", Clamp(v-20.0, 0.0, 1.0));
} else {
v += (30.0/v)*(30.0/v)*(30.0/v)*20.0*billow_octavenoise(m_fracdef[4], 0.5, pt);
}
//ridges and bumps
v += h*0.2*ridged_octavenoise(m_fracdef[4], Clamp(h*0.0002, 0.5, 0.5), pt);
v += h*0.2*voronoiscam_octavenoise(m_fracdef[4], Clamp(1.0-h*0.0002, 0.0, 0.5), pt);
return (v<0 ? 0 : v);
}
}
static inline vector3d interpolate_color(double n, vector3d start, vector3d end)
{
n = Clamp(n, 0.0, 1.0);
return start*(1.0-n) + end*n;
}
void GeoSphereStyle::PickAtmosphere(const SBody *sbody)
{
/* Alpha value isn't real alpha. in the shader fog depth is determined
* by density*alpha, so that we can have very dense atmospheres
* without having them a big stinking solid color obscuring everything
These are our atmosphere colours, for terrestrial planets we use m_atmosOxidizing
for some variation to atmosphere colours
*/
switch (sbody->type) {
case SBody::TYPE_PLANET_GAS_GIANT:
m_atmosColor = Color(1.0f, 1.0f, 1.0f, 0.005f);
m_atmosDensity = 14.0;
break;
case SBody::TYPE_PLANET_ASTEROID:
m_atmosColor = Color(0.0f, 0.0f, 0.0f, 0.0f);
m_atmosDensity = 0.0;
break;
//default:
case SBody::TYPE_PLANET_TERRESTRIAL:
double r,g,b;
r = sbody->m_atmosOxidizing.ToDouble();
g = r;
b = r;
if ((sbody->m_atmosOxidizing > fixed(1,100))
&& (sbody->m_volatileGas > fixed(1,10))) {
if (sbody->m_atmosOxidizing < fixed(1,2)) {
if (sbody->mass > fixed(3,1)) {
// hydrogen
r = 1.0f;
g = 1.0f;
b = 1.0f;
m_atmosColor = Color(r, g, b, 1.0f);
} else {
// methane
r = 0.8f + (r * 1.4);
g = 1.0f - (g * 1.85) ;
b = 0.82f - (b * 0.6);
m_atmosColor = Color(r, g, b, 1.0f);
}
} else {
if (sbody->m_life > fixed(1,2)) {
// oxygen
r = 1.0f - (r * 0.8);
g = 1.0f - (g * 0.7) ;
b = 0.9f + (b * 0.3);
m_atmosColor = Color(r, g, b, 1.0f);
} else {
// co2
r = 1.0f - (r * 0.3);
g = 0.9f - (g * 0.25);
b = 1.0f - (b * 0.3);
m_atmosColor = Color(r, g, b, 1.0f);
}
}
} else m_atmosColor = Color(0.6f, 0.6f, 0.6f, 1.0f);;
m_atmosDensity = sbody->m_volatileGas.ToDouble();
break;
default:
m_atmosColor = Color(0.6f, 0.6f, 0.6f, 1.0f);
m_atmosDensity = sbody->m_volatileGas.ToDouble();
break;
}
}
void GeoSphereStyle::InitHeightMap(const SBody *body)
{
/* Height map? */
if (body->heightMapFilename) {
FILE *f;
f = fopen_or_die(body->heightMapFilename, "r");
// read size!
Uint16 v;
fread(&v, 2, 1, f); m_heightMapSizeX = v;
fread(&v, 2, 1, f); m_heightMapSizeY = v;
m_heightMap = new Sint16[m_heightMapSizeX * m_heightMapSizeY];
// XXX TODO XXX what about bigendian archs...
fread(m_heightMap, sizeof(Sint16), m_heightMapSizeX * m_heightMapSizeY, f);
fclose(f);
} else {
m_heightMap = 0;
}
}
GeoSphereStyle::GeoSphereStyle(const SBody *body)
{
MTRand rand;
rand.seed(body->seed);
m_seed = body->seed;
/* Pick terrain and color fractals to use */
if (body->type == SBody::TYPE_PLANET_GAS_GIANT) {
m_terrainType = TERRAIN_GASGIANT;
switch (rand.Int32(4)) {
case 0: m_colorType = COLOR_GG_SATURN; break;
case 1: m_colorType = COLOR_GG_URANUS; break;
case 2: m_colorType = COLOR_GG_JUPITER; break;
default: m_colorType = COLOR_GG_NEPTUNE; break;
}
} else if (body->type == SBody::TYPE_PLANET_ASTEROID) {
m_terrainType = TERRAIN_ASTEROID;
m_colorType = COLOR_ASTEROID;
} else /* SBody::TYPE_PLANET_TERRESTRIAL */ {
/* Pick terrain and color fractals for terrestrial planets */
//Earth-like world
if ((body->m_life > fixed(7,10)) &&
(body->m_volatileGas > fixed(2,10))){
// There would be no life on the surface without atmosphere
const enum TerrainFractal choices[] = {
TERRAIN_HILLS_RIDGED,
TERRAIN_HILLS_RIVERS,
TERRAIN_MOUNTAINS_RIDGED,
TERRAIN_MOUNTAINS_NORMAL, // HQ terrain
TERRAIN_MOUNTAINS_RIVERS, // HQ terrain
TERRAIN_MOUNTAINS_VOLCANO,
TERRAIN_MOUNTAINS_RIVERS_VOLCANO,
};
m_terrainType = choices[rand.Int32(7)];
//m_terrainType = TERRAIN_MOUNTAINS_NORMAL;
if (body->averageTemp > 240) {
m_colorType = COLOR_EARTHLIKE;
} else {
m_colorType = COLOR_DESERT;
}
printf("earthlike temp: %d\n", body->averageTemp);
}//Harsh, habitable world
else if ((body->m_volatileGas > fixed(2,10)) &&
(body->m_life > fixed(4,10)) ) {
const enum TerrainFractal choices[] = {
TERRAIN_HILLS_RIDGED,
TERRAIN_HILLS_RIVERS,
TERRAIN_MOUNTAINS_NORMAL,
TERRAIN_MOUNTAINS_RIDGED,
TERRAIN_MOUNTAINS_VOLCANO,
TERRAIN_MOUNTAINS_RIVERS_VOLCANO,
TERRAIN_MOUNTAINS_RIVERS,
TERRAIN_RUGGED_DESERT,
};
m_terrainType = choices[rand.Int32(8)];
//m_terrainType = TERRAIN_MOUNTAINS_RIVERS;
if (body->averageTemp > 240) {
m_colorType = COLOR_TFGOOD;;
} else {
m_colorType = COLOR_ICEWORLD;
}
printf("earth/mars-like temp: %d\n", body->averageTemp);
}// Marginally habitable world/ verging on mars like :)
else if ((body->m_volatileGas > fixed(1,10)) &&
(body->m_life > fixed(1,10)) ) {
const enum TerrainFractal choices[] = {
TERRAIN_HILLS_RIDGED,
TERRAIN_HILLS_RIVERS,
TERRAIN_MOUNTAINS_NORMAL,
TERRAIN_MOUNTAINS_RIDGED,
TERRAIN_MOUNTAINS_VOLCANO,
TERRAIN_MOUNTAINS_RIVERS_VOLCANO,
TERRAIN_MOUNTAINS_RIVERS,
TERRAIN_RUGGED_DESERT,
};
m_terrainType = choices[rand.Int32(8)];
//m_terrainType = TERRAIN_MOUNTAINS_RIVERS;
if (body->averageTemp > 240) {
m_colorType = COLOR_TFPOOR;;
} else {
m_colorType = COLOR_ICEWORLD;
}
printf("marslike temp: %d\n", body->averageTemp);
} // Desert-like world, Mars -like.
else if ((body->m_volatileLiquid < fixed(1,10)) &&
(body->m_volatileGas > fixed(1,5))) {
const enum TerrainFractal choices[] = {
TERRAIN_HILLS_DUNES,
TERRAIN_H2O_SOLID,
TERRAIN_RUGGED_DESERT,
TERRAIN_RUGGED_LAVA,
TERRAIN_MOUNTAINS_VOLCANO,
TERRAIN_MOUNTAINS_RIVERS_VOLCANO,
};
m_terrainType = choices[rand.Int32(6)];
//m_terrainType = TERRAIN_MOUNTAINS_NORMAL;
m_colorType = COLOR_DESERT;
} else if ((body->m_volatileIces > fixed(8,10)) &&
(body->averageTemp < 250)) {
const enum TerrainFractal choices[] = {
TERRAIN_HILLS_DUNES,
TERRAIN_HILLS_CRATERS,
TERRAIN_MOUNTAINS_CRATERS,
TERRAIN_H2O_SOLID,
TERRAIN_H2O_SOLID_CANYONS,
TERRAIN_RUGGED_DESERT,
};
m_terrainType = choices[rand.Int32(6)];
m_colorType = COLOR_ICEWORLD;
} else if (body->m_volcanicity > fixed(7,10)) {
// Volcanic world
m_terrainType = TERRAIN_RUGGED_LAVA;
if (body->m_life > fixed(5,10)) { // life on a volcanic world ;)
m_colorType = COLOR_TFGOOD;
} else if (body->m_life > fixed(2,10)) {
m_colorType = COLOR_TFPOOR;
} else m_colorType = COLOR_VOLCANIC;
//Below might not be needed.
} else if (body->m_life > fixed(1,10)) {
const enum TerrainFractal choices[] = {
TERRAIN_HILLS_DUNES,
TERRAIN_HILLS_RIDGED,
TERRAIN_HILLS_RIVERS,
TERRAIN_MOUNTAINS_NORMAL,
TERRAIN_MOUNTAINS_RIDGED,
TERRAIN_MOUNTAINS_VOLCANO,
TERRAIN_MOUNTAINS_RIVERS_VOLCANO,
TERRAIN_MOUNTAINS_RIVERS,
TERRAIN_H2O_SOLID,
TERRAIN_RUGGED_LAVA,
TERRAIN_RUGGED_DESERT,
};
//m_terrainType = TERRAIN_HILLS_DUNES;
m_terrainType = choices[rand.Int32(11)];
m_colorType = COLOR_TFPOOR;
} else if (body->m_volatileGas > fixed(1,10)) {
const enum TerrainFractal choices[] = {
TERRAIN_HILLS_NORMAL,
TERRAIN_MOUNTAINS_NORMAL,
TERRAIN_RUGGED_DESERT,
};
m_terrainType = choices[rand.Int32(3)];
m_colorType = COLOR_ROCK;
} else if (body->m_volatileGas > fixed(1,20)) {
const enum TerrainFractal choices[] = {
TERRAIN_HILLS_CRATERS,
TERRAIN_MOUNTAINS_CRATERS,
TERRAIN_H2O_SOLID,
};
m_terrainType = choices[rand.Int32(3)];
m_colorType = COLOR_ROCK;
} else {
const enum TerrainFractal choices[] = {
TERRAIN_HILLS_CRATERS2,
TERRAIN_MOUNTAINS_CRATERS2,
};
m_terrainType = choices[rand.Int32(2)];
m_colorType = COLOR_ROCK;
}
}
// XXX override the above so you can test particular fractals XXX
//m_terrainType = TERRAIN_RUGGED_DESERT;
//m_colorType = COLOR_DESERT;
m_sealevel = Clamp(body->m_volatileLiquid.ToDouble(), 0.0, 1.0);
m_icyness = Clamp(body->m_volatileIces.ToDouble(), 0.0, 1.0);
m_volcanic = Clamp(body->m_volcanicity.ToDouble(), 0.0, 1.0); // height scales with volcanicity as well
const double rad = body->GetRadius();
m_maxHeightInMeters = std::max(100.0, (9000.0*rad*rad*(m_volcanic+0.5)) / (body->GetMass() * 6.64e-12));
if (!isfinite(m_maxHeightInMeters)) m_maxHeightInMeters = rad * 0.5;
// ^^^^ max mountain height for earth-like planet (same mass, radius)
// and then in sphere normalized jizz
m_maxHeight = std::min(0.5, m_maxHeightInMeters / rad);
//printf("%s: max terrain height: %fm [%f]\n", body->name.c_str(), m_maxHeightInMeters, m_maxHeight);
m_invMaxHeight = 1.0 / m_maxHeight;
m_planetRadius = rad;
m_planetEarthRadii = rad / EARTH_RADIUS;
// Pick some colors, mainly reds and greens
for (int i=0; i<12; i++) m_entropy[i] = rand.Double();
for (int i=0; i<8; i++) {
double r,g,b;
r = rand.Double(0.5, 1.0);
g = rand.Double(0.5, r);
b = rand.Double(0.5, std::min(r, g));
r = std::max(b, r * body->m_metallicity.ToFloat());
g = std::max(b, g * body->m_metallicity.ToFloat());
m_rockColor[i] = vector3d(r, g, b);
}
// Pick some darker colours mainly reds and greens
for (int i=0; i<12; i++) m_entropy[i] = rand.Double();
for (int i=0; i<8; i++) {
double r,g,b;
r = rand.Double(0.05, 0.3);
g = rand.Double(0.05, r);
b = rand.Double(0.05, std::min(r, g));
r = std::max(b, r * body->m_metallicity.ToFloat());
g = std::max(b, g * body->m_metallicity.ToFloat());
m_darkrockColor[i] = vector3d(r, g, b);
}
// grey colours, in case you simply must have a grey colour on a world with high metallicity
for (int i=0; i<12; i++) m_entropy[i] = rand.Double();
for (int i=0; i<8; i++) {
double g;
g = rand.Double(0.3, 0.9);
m_greyrockColor[i] = vector3d(g, g, g);
}
// These are used for gas giant colours, they are more random and *should* really use volatileGasses
for (int i=0; i<12; i++) m_entropy[i] = rand.Double();
for (int i=0; i<8; i++) {
double r,g,b;
r = rand.Double(0.05, 0.5);
g = rand.Double(0.05, 0.5);
b = rand.Double(0.05, 0.5);
m_gglightColor[i] = vector3d(r, g, b);
}
//darker gas giant colours, more reds and greens
for (int i=0; i<12; i++) m_entropy[i] = rand.Double();
for (int i=0; i<8; i++) {
double r,g,b;
r = rand.Double(0.05, 0.3);
g = rand.Double(0.05, r);
b = rand.Double(0.05, std::min(r, g));
m_ggdarkColor[i] = vector3d(r, g, b);
}
PickAtmosphere(body);
InitHeightMap(body);
//fprintf(stderr, "picked terrain %d, colortype %d for %s\n", (int)m_terrainType, (int)m_colorType, body->name.c_str());
InitFractalType(rand);
}
/**
* Feature width means roughly one perlin noise blob or grain.
* This will end up being one hill, mountain or continent, roughly.
*/
void GeoSphereStyle::SetFracDef(struct fracdef_t *def, double featureHeightMeters, double featureWidthMeters, MTRand &rand, double smallestOctaveMeters)
{
// feature
def->amplitude = featureHeightMeters / (m_maxHeight * m_planetRadius);
def->frequency = m_planetRadius / featureWidthMeters;
def->octaves = std::max(1, int(ceil(log(featureWidthMeters / smallestOctaveMeters) / log(2.0))));
def->lacunarity = 2.0;
//printf("%d octaves\n", def->octaves); //print
}
// Fracdef is used to define the fractals width/area, height and detail
void GeoSphereStyle::InitFractalType(MTRand &rand)
{
//Earth uses these fracdef settings
if (m_heightMap) {
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, 1e6, rand, 200);
SetFracDef(&m_fracdef[1], m_maxHeightInMeters, 20.0, rand, 200);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters*0.05, 20.0, rand, 10);
SetFracDef(&m_fracdef[3], m_maxHeightInMeters*0.2, 500.0, rand, 100);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters, 1e4, rand, 100);
SetFracDef(&m_fracdef[5], m_maxHeightInMeters, 1500.0, rand, 500);
return;
}
switch (m_terrainType) {
case TERRAIN_ASTEROID:
//m_maxHeight = rand.Double(0.2,0.4);
//m_invMaxHeight = 1.0 / m_maxHeight;
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, m_planetRadius, rand);
// craters
SetFracDef(&m_fracdef[1], 5000.0, 1000000.0, rand, 1000.0);
break;
case TERRAIN_HILLS_NORMAL:
{
//fractal definitions: fracdef[], feature height, feature area/width, rand, detail up to XXX meters low number is higher detail, dont go below 10
//continents
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6, 1e7), rand, 10000);
SetFracDef(&m_fracdef[1], m_maxHeightInMeters*0.00000000001, 100.0, rand, 10000);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters*0.0000001, rand.Double(500, 2e3), rand, 1000);
SetFracDef(&m_fracdef[3], m_maxHeightInMeters*0.00002, rand.Double(1500, 1e4), rand, 100);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters*0.08, 1e4, rand, 50);
break;
}
case TERRAIN_HILLS_DUNES:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6, 1e7), rand, 10000);
SetFracDef(&m_fracdef[1], m_maxHeightInMeters*0.00001, 1e5, rand, 1000);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters*0.000001, rand.Double(1e5, 1e6), rand, 100);
SetFracDef(&m_fracdef[3], m_maxHeightInMeters*0.0000002, rand.Double(500, 2e4), rand, 50);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters*0.000000008, rand.Double(5, 70), rand, 10);
break;
}
case TERRAIN_HILLS_RIDGED:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6, 1e7), rand, 10000);
SetFracDef(&m_fracdef[1], m_maxHeightInMeters*0.00000000001, 100.0, rand, 10000);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters*0.0000001, rand.Double(500, 2e3), rand, 1000);
SetFracDef(&m_fracdef[3], m_maxHeightInMeters*0.00002, rand.Double(1500, 1e4), rand, 100);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters*0.08, 1e4, rand, 50);
break;
}
case TERRAIN_HILLS_RIVERS:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6, 1e7), rand, 10000);
SetFracDef(&m_fracdef[1], m_maxHeightInMeters*0.00000000001, 100.0, rand, 10000);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters*0.0000001, rand.Double(500, 2e3), rand, 1000);
SetFracDef(&m_fracdef[3], m_maxHeightInMeters*0.00002, rand.Double(1500, 1e4), rand, 100);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters*0.08, 1e4, rand, 50);
break;
}
case TERRAIN_HILLS_CRATERS:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6,1e7), rand);
double height = m_maxHeightInMeters*0.3;
SetFracDef(&m_fracdef[1], height, rand.Double(4.0, 20.0)*height, rand);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters, rand.Double(50.0, 100.0)*m_maxHeightInMeters, rand);
SetFracDef(&m_fracdef[3], m_maxHeightInMeters*0.07, 1e6, rand, 100.0);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters*0.05, 8e5, rand, 100.0);
break;
}
case TERRAIN_HILLS_CRATERS2:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6,1e7), rand);
double height = m_maxHeightInMeters*0.6;
SetFracDef(&m_fracdef[1], height, rand.Double(4.0, 20.0)*height, rand);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters, rand.Double(50.0, 100.0)*m_maxHeightInMeters, rand);
SetFracDef(&m_fracdef[3], m_maxHeightInMeters*0.07, 11e5, rand, 1000.0);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters*0.05, 98e4, rand, 800.0);
SetFracDef(&m_fracdef[5], m_maxHeightInMeters*0.05, 1e6, rand, 400.0);
SetFracDef(&m_fracdef[6], m_maxHeightInMeters*0.04, 99e4, rand, 200.0);
SetFracDef(&m_fracdef[7], m_maxHeightInMeters*0.05, 12e5, rand, 100.0);
SetFracDef(&m_fracdef[8], m_maxHeightInMeters*0.04, 9e5, rand, 100.0);
break;
}
case TERRAIN_MOUNTAINS_NORMAL:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6, 1e7), rand, 10000);
SetFracDef(&m_fracdef[1], m_maxHeightInMeters*0.00000000001, 100.0, rand, 10);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters*0.0000001, rand.Double(500, 2e3), rand, 1000);
SetFracDef(&m_fracdef[3], m_maxHeightInMeters*0.00002, rand.Double(1500, 1e4), rand, 100);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters*0.08, 1e4, rand, 100);
SetFracDef(&m_fracdef[5], m_maxHeightInMeters*0.2, 1e5, rand, 100);
SetFracDef(&m_fracdef[6], m_maxHeightInMeters*0.5, 1e6, rand, 1000);
SetFracDef(&m_fracdef[7], m_maxHeightInMeters*0.5, rand.Double(1e6,1e7), rand, 1000);
SetFracDef(&m_fracdef[8], m_maxHeightInMeters, rand.Double(3e6, 1e7), rand, 1000);
break;
}
case TERRAIN_MOUNTAINS_RIDGED:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6,1e7), rand);
double height = m_maxHeightInMeters*0.9;
SetFracDef(&m_fracdef[1], m_maxHeightInMeters, rand.Double(50.0, 100.0)*m_maxHeightInMeters, rand, 8);
SetFracDef(&m_fracdef[2], height, rand.Double(4.0, 200.0)*height, rand, 10);
SetFracDef(&m_fracdef[3], m_maxHeightInMeters, rand.Double(120.0, 2000.0)*m_maxHeightInMeters, rand, 1000);
height = m_maxHeightInMeters*0.4;
SetFracDef(&m_fracdef[4], m_maxHeightInMeters, rand.Double(100.0, 200.0)*m_maxHeightInMeters, rand);
SetFracDef(&m_fracdef[5], height*0.4, rand.Double(2.5,30.5)*height, rand);
SetFracDef(&m_fracdef[6], height*0.2, rand.Double(20.5,350.5)*height, rand, 10000);
SetFracDef(&m_fracdef[7], m_maxHeightInMeters, rand.Double(100.0, 2000.0)*m_maxHeightInMeters, rand, 100);
SetFracDef(&m_fracdef[8], height*0.3, rand.Double(2.5,300.5)*height, rand, 500);
SetFracDef(&m_fracdef[9], height*0.2, rand.Double(2.5,300.5)*height, rand, 20);
break;
}
case TERRAIN_MOUNTAINS_RIVERS:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6, 2e6), rand, 10);
SetFracDef(&m_fracdef[1], m_maxHeightInMeters, 15e6, rand, 100.0);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters*0.0000001, rand.Double(500, 2e3), rand, 10);
SetFracDef(&m_fracdef[3], m_maxHeightInMeters*0.00002, rand.Double(1500, 1e4), rand, 10);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters*0.08, 1e4, rand, 10);
SetFracDef(&m_fracdef[5], m_maxHeightInMeters*0.2, 1e5, rand, 10);
SetFracDef(&m_fracdef[6], m_maxHeightInMeters*0.5, 1e6, rand, 100);
SetFracDef(&m_fracdef[7], m_maxHeightInMeters*0.5, rand.Double(1e6,5e6), rand, 100);
SetFracDef(&m_fracdef[8], m_maxHeightInMeters, rand.Double(12e5, 22e5), rand, 10);
SetFracDef(&m_fracdef[9], m_maxHeightInMeters, 1e7, rand, 100.0);
break;
}
case TERRAIN_MOUNTAINS_CRATERS:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6,1e7), rand);
double height = m_maxHeightInMeters*0.3;
SetFracDef(&m_fracdef[1], height, rand.Double(4.0, 20.0)*height, rand);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters, rand.Double(50.0, 100.0)*m_maxHeightInMeters, rand);
height = m_maxHeightInMeters*0.3;
SetFracDef(&m_fracdef[4], m_maxHeightInMeters, rand.Double(100.0, 200.0)*m_maxHeightInMeters, rand);
SetFracDef(&m_fracdef[3], height, rand.Double(2.5,3.5)*height, rand);
SetFracDef(&m_fracdef[5], m_maxHeightInMeters*0.05, 8e5, rand, 1000.0);
SetFracDef(&m_fracdef[6], m_maxHeightInMeters*0.05, 1e6, rand, 10000.0);
break;
}
case TERRAIN_MOUNTAINS_CRATERS2:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6,1e7), rand);
double height = m_maxHeightInMeters*0.5;
SetFracDef(&m_fracdef[1], height, rand.Double(50.0, 200.0)*height, rand, 10);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters, rand.Double(500.0, 5000.0)*m_maxHeightInMeters, rand);
height = m_maxHeightInMeters*0.4;
SetFracDef(&m_fracdef[3], height, rand.Double(2.5,3.5)*height, rand);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters, rand.Double(100.0, 200.0)*m_maxHeightInMeters, rand);
SetFracDef(&m_fracdef[5], m_maxHeightInMeters*0.05, 1e6, rand, 10000.0);
SetFracDef(&m_fracdef[6], m_maxHeightInMeters*0.04, 9e5, rand, 10000.0);
SetFracDef(&m_fracdef[7], m_maxHeightInMeters*0.05, 8e5, rand, 10000.0);
SetFracDef(&m_fracdef[8], m_maxHeightInMeters*0.04, 11e5, rand, 10000.0);
SetFracDef(&m_fracdef[9], m_maxHeightInMeters*0.07, 12e5, rand, 10000.0);
break;
}
case TERRAIN_MOUNTAINS_VOLCANO:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6,1e7), rand);
double height = m_maxHeightInMeters*0.8;
SetFracDef(&m_fracdef[1], m_maxHeightInMeters, rand.Double(50.0, 100.0)*m_maxHeightInMeters, rand);
SetFracDef(&m_fracdef[2], height, rand.Double(4.0, 20.0)*height, rand);
SetFracDef(&m_fracdef[3], height, rand.Double(12.0, 200.0)*height, rand);
height = m_maxHeightInMeters*0.7;
SetFracDef(&m_fracdef[4], m_maxHeightInMeters, rand.Double(100.0, 200.0)*m_maxHeightInMeters, rand);
SetFracDef(&m_fracdef[5], height, rand.Double(2.5,3.5)*height, rand);
SetFracDef(&m_fracdef[6], height, rand.Double(2.5,3.5)*height, rand);
// volcano
SetFracDef(&m_fracdef[7], 20000.0, 5000000.0, rand, 1000.0);
// canyons
SetFracDef(&m_fracdef[8], m_maxHeightInMeters*0.5, 2e6, rand, 100.0);
//SetFracDef(&m_fracdef[9], m_maxHeightInMeters*0.1, 1.5e6, rand, 100.0);
//SetFracDef(&m_fracdef[10], m_maxHeightInMeters*0.1, 2e6, rand, 100.0);
break;
}
case TERRAIN_MOUNTAINS_RIVERS_VOLCANO: //old terraformed mars terrain
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6,1e7), rand);
double height = m_maxHeightInMeters*0.6;
SetFracDef(&m_fracdef[1], m_maxHeightInMeters, rand.Double(50.0, 100.0)*m_maxHeightInMeters, rand);
SetFracDef(&m_fracdef[2], height, rand.Double(4.0, 20.0)*height, rand);
SetFracDef(&m_fracdef[3], m_maxHeightInMeters, rand.Double(120.0, 2000.0)*m_maxHeightInMeters, rand, 20);
height = m_maxHeightInMeters*0.3;
SetFracDef(&m_fracdef[4], m_maxHeightInMeters, rand.Double(100.0, 200.0)*m_maxHeightInMeters, rand);
SetFracDef(&m_fracdef[5], height, rand.Double(2.5,3.5)*height, rand);
SetFracDef(&m_fracdef[6], height, rand.Double(2.5,3.5)*height, rand);
// volcano
SetFracDef(&m_fracdef[7], 20000.0, 5000000.0, rand, 100.0);
// canyons and rivers
SetFracDef(&m_fracdef[8], m_maxHeightInMeters*1.0, 4e6, rand, 100.0);
SetFracDef(&m_fracdef[9], m_maxHeightInMeters*1.0, 5e6, rand, 100.0);
//SetFracDef(&m_fracdef[10], m_maxHeightInMeters*0.5, 2e6, rand, 100.0);
break;
}
case TERRAIN_RUGGED_LAVA:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6,1e7), rand);
double height = m_maxHeightInMeters*1.0;
SetFracDef(&m_fracdef[1], m_maxHeightInMeters, rand.Double(50.0, 100.0)*m_maxHeightInMeters, rand);
SetFracDef(&m_fracdef[2], height, rand.Double(4.0, 20.0)*height, rand);
SetFracDef(&m_fracdef[3], height, rand.Double(12.0, 200.0)*height, rand);
height = m_maxHeightInMeters*0.3;
SetFracDef(&m_fracdef[4], m_maxHeightInMeters, rand.Double(100.0, 200.0)*m_maxHeightInMeters, rand);
SetFracDef(&m_fracdef[5], height, rand.Double(2.5,3.5)*height, rand);
// volcanoes
SetFracDef(&m_fracdef[6], height, 5e6, rand, 100000.0);
SetFracDef(&m_fracdef[7], height, 3e6, rand, 1000.0);
// canyon
SetFracDef(&m_fracdef[8], m_maxHeightInMeters*0.4, 4e6, rand, 100.0);
// bumps/rocks
SetFracDef(&m_fracdef[9], height*0.001, rand.Double(10,100), rand, 2.0);
break;
}
case TERRAIN_H2O_SOLID:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(5e6,1e8), rand);
double height = m_maxHeightInMeters*0.3;
SetFracDef(&m_fracdef[1], height, rand.Double(4.0, 20.0)*height, rand);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters, rand.Double(200.0, 1000.0)*m_maxHeightInMeters, rand);
// mountains with some canyons
SetFracDef(&m_fracdef[3], m_maxHeightInMeters*0.4, 4e6, rand);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters*0.4, 5e6, rand);
//crater
SetFracDef(&m_fracdef[5], m_maxHeightInMeters*0.4, 1.5e7, rand, 50000.0);
break;
break;
}
case TERRAIN_H2O_SOLID_CANYONS:
{
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(5e6,1e8), rand);
double height = m_maxHeightInMeters*0.3;
SetFracDef(&m_fracdef[1], height, rand.Double(4.0, 20.0)*height, rand);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters, rand.Double(200.0, 1000.0)*m_maxHeightInMeters, rand);
// mountains with some canyons
SetFracDef(&m_fracdef[3], m_maxHeightInMeters*0.4, 4e6, rand);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters*0.4, 5e6, rand);
//crater
SetFracDef(&m_fracdef[5], m_maxHeightInMeters*0.4, 15e6, rand, 50000.0);
//canyons
//SetFracDef(&m_fracdef[6], m_maxHeightInMeters*0.4, 12e6, rand, 50000.0);
//SetFracDef(&m_fracdef[7], m_maxHeightInMeters*0.4, 9e6, rand, 50000.0);
break;
}
case TERRAIN_RUGGED_DESERT:
{
SetFracDef(&m_fracdef[0], 0.1*m_maxHeightInMeters, 2e6, rand, 180e3);
double height = m_maxHeightInMeters*0.9;
SetFracDef(&m_fracdef[1], height, rand.Double(120.0, 10000.0)*height, rand, 100);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters, rand.Double(1.0, 2.0)*m_maxHeightInMeters, rand);
height = m_maxHeightInMeters*0.3;
SetFracDef(&m_fracdef[3], height, rand.Double(20.0,240.0)*height, rand);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters, rand.Double(1.0, 2.0)*m_maxHeightInMeters, rand);
// dunes
height = m_maxHeightInMeters*0.2;
SetFracDef(&m_fracdef[5], height*0.1, rand.Double(5,75)*height, rand, 10000.0);
// canyon
SetFracDef(&m_fracdef[6], m_maxHeightInMeters*0.2, 1e6, rand, 200.0);
SetFracDef(&m_fracdef[7], m_maxHeightInMeters*0.35, 1.5e6, rand, 100.0);
SetFracDef(&m_fracdef[8], m_maxHeightInMeters*0.2, 3e6, rand, 100.0);
//SetFracDef(&m_fracdef[9], m_maxHeightInMeters*0.1, 100, rand, 10.0);
// adds bumps to the landscape
SetFracDef(&m_fracdef[9], height*0.0025, rand.Double(1,100), rand, 100.0);
break;
}
case TERRAIN_GASGIANT:
case TERRAIN_NONE:
// Added in to prevent compiler warnings
break;
}
// We set some fracdefs here for colours if we need them:
switch (m_colorType) {
case COLOR_NONE:
case COLOR_GG_JUPITER:
{
// spots
double height = m_maxHeightInMeters*0.1;
SetFracDef(&m_fracdef[0], height, 1e8, rand, 1000.0);
SetFracDef(&m_fracdef[1], height, 8e7, rand, 1000.0);
SetFracDef(&m_fracdef[2], height, 4e7, rand, 1000.0);
SetFracDef(&m_fracdef[3], height, 1e7, rand, 100.0);
break;
}
case COLOR_GG_SATURN:
case COLOR_GG_URANUS:
case COLOR_GG_NEPTUNE:
{
// spots
double height = m_maxHeightInMeters*0.1;
SetFracDef(&m_fracdef[0], height, 1e8, rand, 20.0);
SetFracDef(&m_fracdef[1], height, 8e7, rand, 20.0);
break;
}
case COLOR_EARTHLIKE:
{
// crappy water
//double height = m_maxHeightInMeters*0.5;
//SetFracDef(&m_fracdef[3], m_maxHeightInMeters, 1e8, rand, 50.0);
//SetFracDef(&m_fracdef[2], m_maxHeightInMeters, 10, rand, 10.0);
break;
}
case COLOR_DEAD_WITH_H2O:
case COLOR_ICEWORLD:
case COLOR_DESERT:
case COLOR_ROCK:
case COLOR_ROCK2:
case COLOR_ASTEROID:
case COLOR_VOLCANIC:
case COLOR_METHANE:
case COLOR_TFGOOD:
case COLOR_TFPOOR:
case COLOR_BANDED_ROCK:
{
break;
}
}
}
/*
* Must return >= 0.0
Here we create the noise used to generate the landscape, the noise should use the fracdef[] settings that were defined earlier.
*/
double GeoSphereStyle::GetHeight(const vector3d &p)
{
if (m_heightMap) return GetHeightMapVal(p) / m_planetRadius;
switch (m_terrainType) {
case TERRAIN_NONE:
case TERRAIN_GASGIANT:
return 0;
case TERRAIN_ASTEROID:
{
return std::max(0.0, m_maxHeight * (octavenoise(m_fracdef[0], 0.5, p) +
m_fracdef[1].amplitude * crater_function(m_fracdef[1], p)));
}
case TERRAIN_HILLS_NORMAL:
/*case TERRAIN_HILLS_NORMAL:
//continents
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6, 1e7), rand, 10000);
SetFracDef(&m_fracdef[1], m_maxHeightInMeters*0.00000000001, 100.0, rand, 10000);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters*0.0000001, rand.Double(500, 2e3), rand, 1000);
SetFracDef(&m_fracdef[3], m_maxHeightInMeters*0.00002, rand.Double(1500, 1e4), rand, 100);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters*0.08, 1e4, rand, 10);
break;
*/
{
double continents = octavenoise(m_fracdef[0], 0.585, p) - m_sealevel;
if (continents < 0) return 0;
double n = continents;
double distrib = octavenoise(m_fracdef[2], 0.5, p);
double m = m_fracdef[3].amplitude * octavenoise(m_fracdef[4], 0.5*distrib, p);
m += billow_octavenoise(m_fracdef[2], 0.5*distrib, p);
// cliffs at shore
if (continents < 0.001) n += m * continents * 1000.0f;
else n += m;
n += continents*continents*continents*octavenoise(m_fracdef[1], 0.4*distrib, p);
return m_maxHeight * n;
}
case TERRAIN_HILLS_DUNES:
{
double continents = ridged_octavenoise(m_fracdef[0], 0.585, p) - m_sealevel;
if (continents < 0) return 0;
double n = continents;
double distrib = dunes_octavenoise(m_fracdef[1], 0.5*m_fracdef[2].amplitude, p);
double m = 0.1 * m_fracdef[1].amplitude * dunes_octavenoise(m_fracdef[2], 0.5*distrib, p);
double mountains = ridged_octavenoise(m_fracdef[2], 0.5*distrib, p) * octavenoise(m_fracdef[2], 0.5, p) *
octavenoise(m_fracdef[1], 0.5*distrib, p) * distrib;
m += mountains;
//detail for mountains, stops them looking smooth, m_fracdef[4] is a very small scale fractal for close-up
//for this terrain m_fracdef[0-4] gradually decrease in size with 0 being large.
m += mountains*mountains*0.02*octavenoise(m_fracdef[4], 0.6*mountains*mountains*distrib, p);
m *= m*m*m*10.0;
// cliffs at shore
if (continents < 0.01) n += m * continents * 100.0f;
else n += m;
n += continents*Clamp(0.5-m, 0.0, 0.5)*0.2*dunes_octavenoise(m_fracdef[3], 0.6*distrib, p);
n += continents*Clamp(0.05-n, 0.0, 0.01)*0.2*dunes_octavenoise(m_fracdef[4], Clamp(0.5-n, 0.0, 0.5), p);
return n*m_maxHeight;
}
case TERRAIN_HILLS_RIDGED:
{
double continents = ridged_octavenoise(m_fracdef[0], 0.585, p) - m_sealevel;
if (continents < 0) return 0;
double n = continents;
double distrib = ridged_octavenoise(m_fracdef[2], 0.5, p);
double m = m_fracdef[3].amplitude * ridged_octavenoise(m_fracdef[4], 0.5*distrib, p);
m += voronoiscam_octavenoise(m_fracdef[2], 0.5*distrib, p);
// cliffs at shore
if (continents < 0.001) n += m * continents * 1000.0f;
else n += m;
n += continents*continents*continents*ridged_octavenoise(m_fracdef[1], 0.4*distrib, p);
return m_maxHeight * n;
}
case TERRAIN_HILLS_RIVERS:
{
double continents = river_octavenoise(m_fracdef[0], 0.585, p) - m_sealevel;
if (continents < 0) return 0;
double n = continents;
double distrib = voronoiscam_octavenoise(m_fracdef[2], 0.5, p);
double m = m_fracdef[3].amplitude * billow_octavenoise(m_fracdef[4], 0.5*distrib, p);
m += river_octavenoise(m_fracdef[2], 0.5*distrib, p);
// cliffs at shore
if (continents < 0.001) n += m * continents * 1000.0f;
else n += m;
n += continents*continents*continents*ridged_octavenoise(m_fracdef[1], 0.4*distrib, p);
return m_maxHeight * n;
}
case TERRAIN_HILLS_CRATERS:
{
double continents = octavenoise(m_fracdef[0], 0.5, p) - m_sealevel;
if (continents < 0) return 0;
// == TERRAIN_HILLS_NORMAL except river_octavenoise
double n = 0.3 * continents;
double distrib = river_octavenoise(m_fracdef[2], 0.5, p);
double m = m_fracdef[1].amplitude * river_octavenoise(m_fracdef[1], 0.5*distrib, p);
// cliffs at shore
if (continents < 0.001) n += m * continents * 1000.0f;
else n += m;
n += crater_function(m_fracdef[3], p);
n += crater_function(m_fracdef[4], p);
return m_maxHeight * n;
}
case TERRAIN_HILLS_CRATERS2:
{
double continents = octavenoise(m_fracdef[0], 0.5, p) - m_sealevel;
if (continents < 0) return 0;
// == TERRAIN_HILLS_NORMAL except river_octavenoise
double n = 0.3 * continents;
double distrib = river_octavenoise(m_fracdef[2], 0.5, p);
double m = m_fracdef[1].amplitude * river_octavenoise(m_fracdef[1], 0.5*distrib, p);
// cliffs at shore
if (continents < 0.001) n += m * continents * 1000.0f;
else n += m;
n += crater_function(m_fracdef[3], p);
n += crater_function(m_fracdef[4], p);
n += crater_function(m_fracdef[5], p);
n += crater_function(m_fracdef[6], p);
n += crater_function(m_fracdef[7], p);
n += crater_function(m_fracdef[8], p);
return m_maxHeight * n;
}
case TERRAIN_MOUNTAINS_NORMAL:
//This is among the most complex of terrains, so I'll use this as an example:
{
//We need a continental pattern to place our noise onto, the 0.7*ridged_octavnoise..... is important here
// for making 'broken up' coast lines, as opposed to circular land masses, it will reduce the frequency of our
// continents depending on the ridged noise value, we subtract sealevel so that sea level will have an effect on the continents size
double continents = octavenoise(m_fracdef[0], 0.7*
ridged_octavenoise(m_fracdef[8], 0.58, p), p) - m_sealevel*0.65;
// if there are no continents on an area, we want it to be sea level
if (continents < 0) return 0;
double n = continents - (m_fracdef[0].amplitude*m_sealevel*0.5);
// we save the height n now as a constant h
const double h = n;
/* Definitions here for easy referral
SetFracDef(&m_fracdef[0], m_maxHeightInMeters, rand.Double(1e6, 1e8), rand, 100);
SetFracDef(&m_fracdef[1], m_maxHeightInMeters*0.00001, 20.0, rand, 100);
SetFracDef(&m_fracdef[2], m_maxHeightInMeters*0.00001, rand.Double(500, 2e3), rand, 10);
SetFracDef(&m_fracdef[3], m_maxHeightInMeters*0.00002, rand.Double(1500, 1e4), rand, 10);
SetFracDef(&m_fracdef[4], m_maxHeightInMeters*0.08, 1e4, rand, 10);
SetFracDef(&m_fracdef[5], m_maxHeightInMeters*0.3, 1e5, rand, 10);
SetFracDef(&m_fracdef[6], m_maxHeightInMeters*0.8, 1e6, rand, 10);
SetFracDef(&m_fracdef[7], m_maxHeightInMeters, 1e7, rand, 10);
*/
//We don't want to apply noise to sea level n=0
if (n > 0.0) {
//large mountainous shapes
n += h*0.2*ridged_octavenoise(m_fracdef[7],
0.5*octavenoise(m_fracdef[6], 0.5, p), p);
// This smoothes edges near the coast, we cant have vertical terrain its not handled correctly.
if (n < 0.4){
n += n*1.25*ridged_octavenoise(m_fracdef[6],
Clamp(h*0.00002, 0.3, 0.7)*
ridged_octavenoise(m_fracdef[5], 0.5, p), p);
} else {
n += 0.5*ridged_octavenoise(m_fracdef[6],
Clamp(h*0.00002, 0.3, 0.7)*
ridged_octavenoise(m_fracdef[5], 0.5, p), p);
}
if (n < 0.2){
n += n*15.0*river_octavenoise(m_fracdef[6],
Clamp(h*0.00002, 0.5, 0.7), p);
} else {
n += 3.0*river_octavenoise(m_fracdef[6],
Clamp(h*0.00002, 0.5, 0.7), p);
}
if (n < 0.4){
n += n*billow_octavenoise(m_fracdef[6],
0.5*octavenoise(m_fracdef[5], 0.5, p), p);
} else {
n += (0.16/n)*billow_octavenoise(m_fracdef[6],
0.5*octavenoise(m_fracdef[5], 0.5, p), p);
}
if (n < 0.2){
n += n*billow_octavenoise(m_fracdef[5],
0.5*octavenoise(m_fracdef[5], 0.5, p), p);
} else {
n += (0.04/n)*billow_octavenoise(m_fracdef[5],
0.5*octavenoise(m_fracdef[5], 0.5, p), p);
}
//smaller ridged mountains
n += n*0.7*ridged_octavenoise(m_fracdef[5],
0.5*octavenoise(m_fracdef[6], 0.5, p), p);
n = (n/2)+(n*n);