I am trying to create custom geometry shape in SceneKit and my shape turn out fine. The only problem is that it is black and even though I changed the color, it still remain black. I have tested with other primitive shapes in SceneKit and they turned out normal. I thought I have to calculate the surface normal but according to other tutorials and code samples online, unless I want my shape to be certain way, I don't have to calculate the surface normal and the framework will default it for me. I can't figure out why my shape is black and I have looked at different topic on here and I could not find an answer that work for me. I am pretty new to SceneKit and Swift. Here is my code:
import UIKit
import SceneKit
import QuartzCore
class GameViewController: UIViewController {
var scnView: SCNView!
var scnScene: SCNScene!
var cameraNode: SCNNode!
override func viewDidLoad() {
super.viewDidLoad()
setupView()
setupScene()
setupCamera()
spawnShape()
}
func shouldAutorotate() -> Bool {
return true
}
func prefersStatusBarHidden() -> Bool {
return true
}
func setupView() {
scnView = self.view as! SCNView
// 1
scnView.showsStatistics = true
// 2
scnView.allowsCameraControl = true
// 3
scnView.autoenablesDefaultLighting = true
}
func setupScene() {
scnScene = SCNScene()
scnView.scene = scnScene
scnView.backgroundColor = UIColor.white
}
func setupCamera() {
// 1
cameraNode = SCNNode()
// 2
cameraNode.camera = SCNCamera()
// 3
cameraNode.position = SCNVector3(x: 0, y: 0, z: 15)
// 4
scnScene.rootNode.addChildNode(cameraNode)
}
Here is where I create my custom shape. I have tested with other primitive shapes and they work fine, but my custom shape turn out black for some reasons I don't know:
func spawnShape() {
// 1
var geometry:SCNGeometry
let positions = [
SCNVector3(0, 1, 0),
SCNVector3(-0.5, 0, 0.5),
SCNVector3(0.5, 0, 0.5),
SCNVector3(0.5, 0, -0.5),
SCNVector3(-0.5, 0, -0.5),
SCNVector3(0, -1, 0),
]
let source = SCNGeometrySource(vertices: positions)
let indices:[UInt32] = [
0, 1, 2,
2, 3, 0,
3, 4, 0,
4, 1, 0,
1, 5, 2,
2, 5, 3,
3, 5, 4,
4, 5, 1
]
let element = SCNGeometryElement(indices: indices, primitiveType:.triangles)
// 4
geometry = SCNGeometry(sources: [source], elements: [element])
geometry.firstMaterial?.diffuse.contents = UIColor.white
let geometryNode = SCNNode(geometry: geometry)
// 5
scnScene.rootNode.addChildNode(geometryNode)
}
}
Much appreciated if someone could help me understand. Thank you
