public static float Sum(NoiseMethod method, Vector3 point, PerlinNoiseSettings settings)
{
var frequency = settings.frequency;
float sum = method(point, frequency);
float amplitude = 1f;
float range = 1f;
for (int o = 1; o < settings.octaves; o++)
{
frequency *= settings.lacunarity;
amplitude *= settings.persistence;
range += amplitude;
sum += method(point, frequency) * amplitude;
}
return(sum / range);
}
public static Texture2D PerlinNoise(int resolution, PerlinNoiseSettings settings)
{
var texture = new Texture2D(resolution, resolution, TextureFormat.RFloat, false, true);
texture.name = "Perlin Noise Texture";
texture.wrapMode = TextureWrapMode.Clamp;
texture.filterMode = FilterMode.Trilinear;
texture.anisoLevel = 9;
var method = NoiseHelper.noiseMethods[(int)NoiseMethodType.Perlin][2];
var point00 = new Vector3(0, 0);
var point10 = new Vector3(1f, 0);
var point01 = new Vector3(0, 1f);
var point11 = new Vector3(1f, 1f);
var stepSize = 1f / resolution;
for (var y = 0; y < resolution; y++)
{
var point0 = Vector3.Lerp(point00, point01, (y + 0.5f) * stepSize);
var point1 = Vector3.Lerp(point10, point11, (y + 0.5f) * stepSize);
for (var x = 0; x < resolution; x++)
{
var point = Vector3.Lerp(point0, point1, (x + 0.5f) * stepSize);
var sample = NoiseHelper.Sum(method, point, settings);
sample = sample * 0.5f + 0.5f;
texture.SetPixel(x, y, new Color(sample, sample, sample));
}
}
texture.Apply();
return(texture);
}
