int sections = 2;

int dimension = TerrainChunkGenerator.GetChunkDimension(sections);
var vertices = TerrainChunkGenerator.GenChunkVertices(dimension);
var normals = TerrainChunkGenerator.GenChunkNormals(dimension);
var texcoords = TerrainChunkGenerator.GenChunkTexcoords(dimension);
var indexes = TerrainChunkGenerator.GenChunkIndexes(dimension);

using (var file = File.Create("./test.obj"))
{
    using var writer = new StreamWriter(file);

    writer.WriteLine("o terrain-chunk");
    writer.WriteLine("# Vertices");
    for (int row = 0; row < dimension; row++)
    {
        for (int col = 0; col < dimension; col++)
        {
            writer.WriteLine(vertices[col + row * dimension].ToObjVertex());
        }
    }

    writer.WriteLine("# Normals");
    for (int row = 0; row < dimension; row++)
    {
        for (int col = 0; col < dimension; col++)
        {
            writer.WriteLine(normals[col + row * dimension].ToObjNormal());
        }
    }

    writer.WriteLine("# Texcoords");
    for (int row = 0; row < dimension; row++)
    {
        for (int col = 0; col < dimension; col++)
        {
            writer.WriteLine(texcoords[col + row * dimension].ToObjTexcoord());
        }
    }

    writer.WriteLine("# Indexes");
    writer.WriteLine("g terrain-chunk");
    for (int i = 0; i < indexes.Length; i += 3)
    {
        writer.WriteLine("f " + string.Join(' ', indexes[i..(i + 3)].Select(index => $"{index}/{index}/{index}")));
    }
}