FLOAT32 CFrmPerlin::TileableNoise3D(const FLOAT32 x, const FLOAT32 y, const FLOAT32 z, const FLOAT32 w, const FLOAT32 h, const FLOAT32 d)
{
return ( Noise3D( x, y, z ) * ( w - x ) * ( h - y ) * ( d - z ) +
Noise3D( x - w, y, z ) * x * ( h - y ) * ( d - z ) +
Noise3D( x, y - h, z ) * ( w - x ) * y * ( d - z ) +
Noise3D( x - w, y - h, z ) * x * y * ( d - z ) +
Noise3D( x, y, z - d ) * ( w - x ) * ( h - y ) * z +
Noise3D( x - w, y, z - d ) * x * ( h - y ) * z +
Noise3D( x, y - h, z - d ) * ( w - x ) * y * z +
Noise3D( x - w, y - h, z - d ) * x * y * z ) / ( w * h * d );
}
ssfloat ExpMgr::Turbulence3D(ssfloat x, ssfloat y, ssfloat z)
{
ssfloat turb, s, limit;
turb = -1.0;
s = 1;
limit = 1.0/256;
while (s > limit) {
turb += s * Noise3D(x/s,y/s,z/s);
s /= 2;
}
return turb;
}
FLOAT32 CFrmPerlin::Turbulence3D( const FLOAT32 x, const FLOAT32 y, const FLOAT32 z,
FLOAT32 fFrequency, UINT32 nNumOctaves,
FLOAT32 fAmplitude, FLOAT32 fPersistence )
{
FLOAT32 fTotal = 0.0f;
for( UINT32 i=0; i<nNumOctaves; i++ )
{
fTotal += Noise3D( fFrequency * x, fFrequency * y, fFrequency * z ) * fAmplitude;
fFrequency *= 2.0f;
fAmplitude *= fPersistence;
}
return fTotal;
}
float ValueNoise3D(float x, float y, float z, float amplitude, float wavelength, int octaves, float factor, int seed)
{
float sum = 0.0f;
float range_adjust = 0.0f;
float temp_amp = 1.0f;
for(int i = 0; i < octaves; i ++)
{
sum += temp_amp * Noise3D(x / wavelength, y / wavelength, z / wavelength, seed);
wavelength *= factor;
temp_amp *= factor;
range_adjust += temp_amp;
}
return amplitude * (sum / range_adjust);
}
/*
* Tileable 3D noise
*/
float Noise::TileNoise3D(
float x, float y, float z,
float width, float height, float depth)
{
float invX = width - x;
float invY = height - y;
float invZ = depth - z;
return (
Noise3D(x, y, z) * invX * invY * invZ +
Noise3D(invX, y, z) * x * invY * invZ +
Noise3D(x, invY, z) * invX * y * invZ +
Noise3D(x, y, invZ) * invX * invY * z +
Noise3D(invX, invY, z) * x * y * invZ +
Noise3D(invX, y, invZ) * x * invY * z +
Noise3D(x, invY, invZ) * invX * y * z +
Noise3D(invX, invY, invZ) * x * y * z
) / (width * height * depth);
}
/*
* Looping 3D noise
*/
float Noise::LoopNoise3D(float x, float y, float z, float zPeriod)
{
return ((zPeriod - z) * Noise3D(x,y,z) +
z * Noise3D(x, y, zPeriod - z)) / zPeriod;
}
void eval_noise(Expr *expr)
{
expr->l->fn(expr->l);
expr->v.x = Noise3D(&expr->l->v);
}
