LibNoise example

gistfile1.txt

int[,] level = new int[200,100]
caveNoiseScalar = 9;
levelRatio = (float) level.GetLength(0) /  level.GetLength(1);

RidgedMultifractal mountainTerrain = new RidgedMultifractal();
Noise2D heightMapBuilder = new Noise2D(level.GetLength(0), level.GetLength(1), mountainTerrain);
Vector2Int startPoint = new Vector2Int(Random.Range(0, 8192), Random.Range(0, 8192));
heightMapBuilder.GeneratePlanar(startPoint.x + 0, startPoint.x + caveNoiseScalar * levelRatio, startPoint.y + 0, startPoint.y + caveNoiseScalar);

float[,] heightMap = heightMapBuilder.GetNormalizedData();

for (int x = 0; x < level.GetLength(0); x++) {
    for (int y = 0; y < level.GetLength(1); y++) {
        float noiseSample = heightMap[x, y];

        if (noiseSample > 0.5f) {
        
            //setup the array
            level[x, y] = 1;
            
            //or directly instantiate tiles from here
            Instantiate(tilePrefab, new Vector3(x, y, 0), Quaternion.identity);
        }
    }
}