Vector PerlinGenerator::at( const Vector& pos )
{
//return sky( pos.x,pos.y,pos.z, SKY_BLUE, CLOUD_WHITE ) ;
Vector n = pos/worldNormalizer ;
switch( noiseType )
{
case PerlinNoiseType::Sky:
return sky( n.x, n.y, n.z, SKY_BLUE, CLOUD_WHITE ) ;
case PerlinNoiseType::Wood:
return wood( n.x, n.y, n.z ) ;
case PerlinNoiseType::Marble:
default:
return marble( n.x,n.y,n.z, n.x ) ;
case PerlinNoiseType::CustomLinear:
return linearSpline( PerlinNoise3D( n.x,n.y,n.z, persistence, lacunarity, octaves ) ) ;
case PerlinNoiseType::CustomQuadratic:
return quadraticSpline( PerlinNoise3D( n.x,n.y,n.z, persistence, lacunarity, octaves ) ) ;
case PerlinNoiseType::CustomCubic:
return cubicSpline( PerlinNoise3D( n.x,n.y,n.z, persistence, lacunarity, octaves ) ) ;
case PerlinNoiseType::CustomQuartic:
return quarticSpline( PerlinNoise3D( n.x,n.y,n.z, persistence, lacunarity, octaves ) ) ;
case PerlinNoiseType::CustomQuintic:
return quinticSpline( PerlinNoise3D( n.x,n.y,n.z, persistence, lacunarity, octaves ) ) ;
}
}
Dataset* Dataset::createPyroclasticVolume(size_t sz, float r)
{
Dataset* dataset = new Dataset;
dataset->width = dataset->height = dataset->slices = sz;
dataset->bytes_elem = sizeof(GLubyte);
dataset->data = new GLubyte[sz * sz * sz];
GLubyte* ptr = (GLubyte*) dataset->data;
float frequency = 3.0f / sz;
float center = sz / 2.0f + 0.5f;
for(size_t x = 0; x < sz; ++x) {
for(size_t y = 0; y < sz; ++y) {
for(size_t z = 0; z < sz; ++z) {
float dx = center - x;
float dy = center - y;
float dz = center - z;
float off = fabsf((float) PerlinNoise3D(x * frequency, y * frequency, z * frequency, 5, 6, 3));
float d = sqrtf(dx*dx + dy*dy + dz*dz) / sz;
bool isFilled = (d - off) < r;
*ptr++ = isFilled ? 255 : 0;
}
}
}
dataset->loaded(true);
dataset->uploaded(false);
return dataset;
}
void maze(int low, int high)
{
int x, y, z, lines, num, dimension_increment;
for(x = 1; x < WORLDX-1; x++)
for(y = low; y <= high; y++)
for(z = 1; z < WORLDZ-1; z++)
if(0 < PerlinNoise3D(x/12.0, y/12.0, z/12.0, 2.1, 1.9, 2))
{
if(rand() % 3 > 1)
world[x][y][z] = STONE;
else
world[x][y][z] = DIRT;
}
for(dimension_increment = 0; dimension_increment <= 1; dimension_increment++)
{
for(x = 0; x < WORLDX; x++)
for(y = low; y <= high; y++)
{
if(dimension_increment == 0)
{
world[x][y][0] = STONE;
world[x][y][WORLDZ-1] = STONE;
}
else
{
world[0][y][x] = STONE;
world[WORLDX-1][y][x] = STONE;
}
}
lines = rand() % 15;
for(num = 0; num < lines; num++)
{
if(num == 0) x = 45;
else x = rand() % (WORLDX-1);
for(z = 1; z < WORLDZ-1; z++)
{
for(y = low; y <= high; y++)
{
if(dimension_increment == 0)
{
world[x][y][z] = EMPTY;
}
else if(dimension_increment == 1)
{
world[z][y][x] = EMPTY;
}
}
}
}
}
}
Vector PerlinGenerator::marble( double x, double y, double z, double grainVariable,
int freckling, double freqBoost,
const Vector& c1, const Vector& c2, const Vector& c3, const Vector& c4 )
{
// sin( x + |noise(p)| + .5*|noise(2p)| + ... )
real n = PerlinNoise3D( x,y,z, 2, 2, freckling ) ;
real val = sin( freqBoost*(grainVariable + n) ) ;
// You can also blend using a bezier type spline,
real t = ( 1 + val ) / 2.0 ;
return cubicSpline( t,c1,c2,c3,c4 ) ;
}
Vector PerlinGenerator::marble( double x, double y, double z, double grainVariable,
int freckling, double freqBoost, const Vector& c1, const Vector& c2 )
{
// sin( x + |noise(p)| + .5*|noise(2p)| + ... )
real n = PerlinNoise3D( x,y,z, 2, 2, freckling ) ;
real val = sin( freqBoost*(grainVariable + n) ) ;
// has black rifts between colors,
////if( val < 0 ) return (-val)*colorMinus;
////else return val*colorPlus;
real t = (1+val)/2.0 ;
return linearSpline( t, c1, c2 ) ;
}
static inline void cbite()
{
auto startTime = boost::get_system_time().time_of_day().total_milliseconds();
for (int x = 0 ; x < 128 ; ++x)
{
double xx = x;
for (int y = 0 ; y < 128 ; ++y)
{
double yy = y;
for (int z = 0 ; z < 128 ; ++z)
{
double zz = z;
PerlinNoise3D(xx, yy, zz, 2.0, 2.0, 4);
}
}
}
std::cout << "c time= " << (boost::get_system_time().time_of_day().total_milliseconds() - startTime) << "ms\n";
}
Vector PerlinGenerator::sky( double x, double y, double z, const Vector& skyColor, const Vector& cloud )
{
//real val = PerlinNoise3D( x,y,z, 1.2, 2, 12 ) ; // rocky and pixellated
///////real a=.1, // a is the size of the sides. a=big means THICK DONUT
/////// c=.6; // c is the size of the ring. c=big means LARGE CIRCUMFERENCE DONUT
///////x *= 2*PI ;
///////y *= 2*PI ;
///////real xt = (c+a*cos(y))*cos(x);
///////real yt = (c+a*cos(y))*sin(x);
///////real zt = a*sin(y);
///////real val = PerlinNoise3D( xt,yt,zt, 1.5, 2, 12 ) ; // torus
real val = PerlinNoise3D( x,y,z, 1.5, 2, 12 ) ; // "very good" cloud
//real val = PerlinNoise3D( x,y,z, 2, 4, 12 ) ; // smoother than "very good"
//real val = PerlinNoise3D( x,y,z, 2, 2, 12 ) ; // too smooth
// force x,y,z input values to REPEAT, making it tileable
// travel in a torus.
//real c=4, a=1;
//real x1 = (c+a*cos(y))*cos(x);
//real y1 = (c+a*cos(y))*sin(x);
//real val = PerlinNoise2D( x,y, 2, 2, 12 ) ; // test
real t = (1+val)/2.0 ;
//return (t*t*skyColor + (1-t)*(1-t)*cloud).clamp(0,1) ; // DARKER clouds
//return (t*skyColor + (1-t)*(1-t)*cloud).clamp(0,1) ; // lighter clouds
//return linearSpline( t, skyColor, cloud ) ; //very smooth, light clouds day
//return cubicSpline( t, 1, .5, Vector( 0.570, 0.710, 1.000 ), Vector( .168, .612, 1 ) ) ; // another nice cloud
//return cubicSpline( t, cloud, .5, Vector(0.2016, 0.7344, 1), skyColor ) ;
//return cubicSpline( t, cloud, cloud*.5, (skyColor*1.2).clamp(0,1), skyColor ) ;
//return cubicSpline( t, cloud, 0,.5, skyColor ) ; // dark/ominous.
//return quinticSpline( t, cloud, .5,Vector(.2,.4,1),-.2,1, skyColor ) ; // abstract/painterly
//return quinticSpline( t, cloud, .5, .5, 0, Vector(.2,.4,1), skyColor ) ; // ok
return quadraticSpline( t, cloud, .6, skyColor ) ; // Very good.
}
/* Makes perlin-noise clouds! Uses Ken Perlin's PerlinNoise3D function, taken from
http://local.wasp.uwa.edu.au/~pbourke/texture_colour/perlin */
void perlin_clouds(double level, double scale, double deg)
{
int x, z;
GLfloat *light = getLightPosition();
clouds_flag = 1;
level = bounds(level, 0, WORLDY-1);
for(x = 0; x < WORLDX; x++)
{
for(z = 0; z < WORLDZ; z++)
{
/* Overwrite whatever was here before, as long as it isn't the sun. */
if(!((float)x == light[0] && level == light[1] && (float)z == light[2]))
world[x][(int)level][z] = EMPTY;
/* Using deg (from update) as the y-axis, step through slices of
smooth volumetric noise to get realistic looking clouds. */
if((PerlinNoise3D(x/76.0, z/76.0, deg/108.0, 1.99, 2.1, 4) * scale) > 0)
world[x][(int)level][z] = WHITE;
}
}
}
//======================================================================================
//======================================================================================
double PNoise::PNoise3D(double x, double y, double z)
{
return PerlinNoise3D(x,y,z, _n, _alpha, _beta);
}