Custom geometry with UV texture mapping

Geometry.swift

//**************
// It works now, but theres some things that I don't get it yet
// like the texture faces in the UV mapping, theres no logic order (at least that I can understand)
//**************

// Texture image
// https://imgur.com/jwKWRBJ
let texture = #imageLiteral(resourceName: "texture")
// Half geometry size
let halfSide: Float = 0.5

// Geometry vertices
let vertices: [SCNVector3] = [
    SCNVector3(-halfSide, -halfSide,  halfSide),
    SCNVector3( halfSide, -halfSide,  halfSide),
    SCNVector3(-halfSide, -halfSide, -halfSide),
    SCNVector3( halfSide, -halfSide, -halfSide),
    SCNVector3(-halfSide,  halfSide,  halfSide),
    SCNVector3( halfSide,  halfSide,  halfSide),
    SCNVector3(-halfSide,  halfSide, -halfSide),
    SCNVector3( halfSide,  halfSide, -halfSide),
    
    // repeat exactly the same
    SCNVector3(-halfSide, -halfSide,  halfSide),
    SCNVector3( halfSide, -halfSide,  halfSide),
    SCNVector3(-halfSide, -halfSide, -halfSide),
    SCNVector3( halfSide, -halfSide, -halfSide),
    SCNVector3(-halfSide,  halfSide,  halfSide),
    SCNVector3( halfSide,  halfSide,  halfSide),
    SCNVector3(-halfSide,  halfSide, -halfSide),
    SCNVector3( halfSide,  halfSide, -halfSide),

    // repeat exactly the same
    SCNVector3(-halfSide, -halfSide,  halfSide),
    SCNVector3( halfSide, -halfSide,  halfSide),
    SCNVector3(-halfSide, -halfSide, -halfSide),
    SCNVector3( halfSide, -halfSide, -halfSide),
    SCNVector3(-halfSide,  halfSide,  halfSide),
    SCNVector3( halfSide,  halfSide,  halfSide),
    SCNVector3(-halfSide,  halfSide, -halfSide),
    SCNVector3( halfSide,  halfSide, -halfSide),
]

// Geometry Indices
// Don't know if the order of the faces is important
let indices: [Int16] = [
    // Bottom
    0, 2, 1,
    1, 2, 3,
    // Back
    10, 14, 11,
    11, 14, 15,
    // Left
    16, 20, 18,
    18, 20, 22,
    // Right
    17, 19, 21,
    19, 23, 21,
    // Front
    8, 9, 12,
    9, 13, 12,
    // Top
    4, 5, 6,
    5, 7, 6,
]

// Tile width
// because the width of the texture is 1
// and we have 6 tiles inside.
// I just imagine that the texture coords will be applied 
// in the order of the faces was added, 
// so it starts with top, bottom, front, back, left, right.
// I separate them by group of 4, 
// thats why is a new line between each group
let width: CGFloat = 1 / 6
let coordinates: [CGPoint] = [
    CGPoint(x: 0,     y: 0),// Bottom
    CGPoint(x: width, y: 0),// Bottom
    CGPoint(x: width, y: 1),// Bottom
    CGPoint(x: 0,     y: 1),// Bottom
    CGPoint(x: width * 5, y: 0),// Top
    CGPoint(x: 1,         y: 0),// Top
    CGPoint(x: 1,         y: 1),// Top
    CGPoint(x: width * 5, y: 1),// Top
    CGPoint(x: width * 4, y: 0),// Front
    CGPoint(x: width * 5, y: 0),// Front
    CGPoint(x: width,     y: 0),// Back
    CGPoint(x: width * 2, y: 0),// Back
    CGPoint(x: width * 5, y: 1),// Front
    CGPoint(x: width * 4, y: 1),// Front
    CGPoint(x: width * 2, y: 1),// Back
    CGPoint(x: width,     y: 1),// Back
    CGPoint(x: width * 2, y: 0),// Left
    CGPoint(x: width * 3, y: 0),// Right
    CGPoint(x: width * 3, y: 1),// Left
    CGPoint(x: width * 4, y: 1),// Right
    CGPoint(x: width * 3, y: 0),// Left
    CGPoint(x: width * 4, y: 0),// Right
    CGPoint(x: width * 2, y: 1),// Left
    CGPoint(x: width * 3, y: 1),// Right
]

// Create the sources
let sources = [
    SCNGeometrySource(vertices: vertices),
    SCNGeometrySource(textureCoordinates: coordinates)
]

// Setup the indices
let indicesData = Data(bytes: indices, count: MemoryLayout<Int16>.size * indices.count)
let elements = [
    SCNGeometryElement(data: indicesData, primitiveType: .triangles, primitiveCount: indices.count / 3, bytesPerIndex: MemoryLayout<Int16>.size)
]

// Create the geometry
let geometry = SCNGeometry(sources: sources, elements: elements)
// Add the texture to it as the first material content
geometry.firstMaterial?.diffuse.contents = texture

// Add the geometry to the node and scene
let node = SCNNode(geometry: geometry)
scene.rootNode.addChildNode(node)

Solved the UV mapping with this stackoverflow answer