Fbm

Fbm.cpp

// Fractional Brownian motion
float fBm(const glm::vec3 pos, const int octaveCount, float lacunarity, float gain )
{
	float noiseSum     = 0.0;
	float amplitude    = 1.0;
	float amplitudeSum = 0.0;
	
	glm::vec3 sample = pos;
	
	for( int i = 0; i < octaveCount; ++i )
	{
		noiseSum     += amplitude * glm::simplex( sample );
		amplitudeSum += amplitude;
		
		amplitude *= gain;
		sample    *= lacunarity;
	}
	
	return (noiseSum / amplitudeSum);
}


void somewhere()
{
	float z = 0.4;
	for(int j=0; j<HEIGHT; ++j)
	{
		for(int i=0; i<WIDTH; ++i)
		{
			glm::vec3 sample(i/float(WIDTH), j/float(HEIGHT), z);
			float altitude = 0.5 + 0.5*fBm( coord, 8, 2.18387276, 0.521869 );
		}
	}
}