Let us next add geometry to the scene. We can create some basic geometry such as spheres, boxes, cones, tori, and so on in SceneKit with ease. Let us create a sphere first and add it to the scene.
Create a function called addGeometryNode in the class and add the following code in it:
func addGeometryNode(){
let sphereGeometry = SCNSphere(radius: 1.0)
sphereGeometry.firstMaterial?.diffuse.contents = UIColor.orangeColor()
let sphereNode = SCNNode(geometry: sphereGeometry)
sphereNode.position = SCNVector3Make(0.0, 0.0, 0.0)
scene.rootNode.addChildNode(sphereNode)
}For creating geometry, we use the SCNSphere class to create a sphere shape. We can also call SCNBox, SCNCone, SCNTorus, and so on to create box, cone, or torus shapes respectively.
While creating the sphere, we have to provide the radius as a parameter, which will determine the size of the sphere. Although to place the shape, we have to attach it...