How to use "*.scnp" file in SwiftUI for button click (iOS)? - ios

Question

I have "Explode.scnp" SceneKit file. It's already configured, the texture has been set.
How we can use it in SwiftUI?
For example, after the button clicks the background will be animated once.
var body: some View {
ZStack {
VStack {
Button(action: {
Particles()
}) {
Text("Animate")
}
}
}
}
This code works for scn. but how to use it with scnp?
import SwiftUI
import SceneKit
struct ScenekitView : UIViewRepresentable {
let scene = SCNScene(named: "art.scnassets/ship.scn")!
func makeUIView(context: Context) -> SCNView {
// create and add a camera to the scene
let cameraNode = SCNNode()
cameraNode.camera = SCNCamera()
scene.rootNode.addChildNode(cameraNode)
// place the camera
cameraNode.position = SCNVector3(x: 0, y: 0, z: 15)
// create and add a light to the scene
let lightNode = SCNNode()
lightNode.light = SCNLight()
lightNode.light!.type = .omni
lightNode.position = SCNVector3(x: 0, y: 10, z: 10)
scene.rootNode.addChildNode(lightNode)
// create and add an ambient light to the scene
let ambientLightNode = SCNNode()
ambientLightNode.light = SCNLight()
ambientLightNode.light!.type = .ambient
ambientLightNode.light!.color = UIColor.darkGray
scene.rootNode.addChildNode(ambientLightNode)
// retrieve the ship node
let ship = scene.rootNode.childNode(withName: "ship", recursively: true)!
// animate the 3d object
ship.runAction(SCNAction.repeatForever(SCNAction.rotateBy(x: 0, y: 2, z: 0, duration: 1)))
// retrieve the SCNView
let scnView = SCNView()
return scnView
}
func updateUIView(_ scnView: SCNView, context: Context) {
scnView.scene = scene
// allows the user to manipulate the camera
scnView.allowsCameraControl = true
// show statistics such as fps and timing information
scnView.showsStatistics = true
// configure the view
scnView.backgroundColor = UIColor.black
}
}
#if DEBUG
struct ScenekitView_Previews : PreviewProvider {
static var previews: some View {
ScenekitView()
}
}
#endif
Moreover, Xcode version is 11.3.1.
When I try to create a new file I have this:
And the extension is SKS... any ideas?
Reworked the code according to #Asperi version:
import SwiftUI
import SceneKit
struct ScenekitView : UIViewRepresentable {
#Binding var exploding: Bool
//let scene = SCNScene(named: "SceneKit.scnassets/Explode.scnp")!
let scene = SCNScene(named: "SceneKit.scnassets/scene.scn")!
func makeUIView(context: Context) -> SCNView {
// create and add a camera to the scene
let cameraNode = SCNNode()
cameraNode.camera = SCNCamera()
scene.rootNode.addChildNode(cameraNode)
// place the camera
cameraNode.position = SCNVector3(x: 0, y: 0, z: 15)
// create and add a light to the scene
let lightNode = SCNNode()
lightNode.light = SCNLight()
lightNode.light!.type = .omni
lightNode.position = SCNVector3(x: 0, y: 10, z: 10)
scene.rootNode.addChildNode(lightNode)
// create and add an ambient light to the scene
let ambientLightNode = SCNNode()
ambientLightNode.light = SCNLight()
ambientLightNode.light!.type = .ambient
ambientLightNode.light!.color = UIColor.darkGray
scene.rootNode.addChildNode(ambientLightNode)
// retrieve the ship node
let ship = scene.rootNode.childNode(withName: "blow", recursively: true)!
// animate the 3d object
ship.runAction(SCNAction.repeatForever(SCNAction.rotateBy(x: 0, y: 2, z: 0, duration: 1)))
// retrieve the SCNView
let scnView = SCNView()
return scnView
}
func updateUIView(_ scnView: SCNView, context: Context) {
scnView.scene = scene
// allows the user to manipulate the camera
scnView.allowsCameraControl = true
// show statistics such as fps and timing information
scnView.showsStatistics = true
// configure the view
scnView.backgroundColor = UIColor.black
if exploding {
if let scene = scene.rootNode.childNode(withName: "SceneKit.scnassets/scene", recursively: false),
let particles = SCNParticleSystem(named: "SceneKit.scnassets/Explode", inDirectory: nil) {
let node = SCNNode()
node.addParticleSystem(particles)
node.position = scene.position
scnView.scene?.rootNode.addChildNode(node)
scene.removeFromParentNode()
}
}
}
}
Errors related to the path names ...
// retrieve the ship node
here. Tried .sks, .scnp ... any ideas?

Answer 1

Here is modified code with demo. Tested with Xcode 11.4 / macOS 10.15.4
Note: as I don't know your project structure, all dependent resource files were added as Resources (not in Assets). Just in case.
struct DemoSceneKitParticles: View {
#State private var exploding = false
var body: some View {
VStack {
ScenekitView(exploding: $exploding)
Button("BOOM") { self.exploding = true }
}
}
}
struct ScenekitView : NSViewRepresentable {
#Binding var exploding: Bool
let scene = SCNScene(named: "ship.scn")!
func makeNSView(context: NSViewRepresentableContext<ScenekitView>) -> SCNView {
// create and add a camera to the scene
let cameraNode = SCNNode()
cameraNode.camera = SCNCamera()
scene.rootNode.addChildNode(cameraNode)
// place the camera
cameraNode.position = SCNVector3(x: 0, y: 0, z: 15)
// create and add a light to the scene
let lightNode = SCNNode()
lightNode.light = SCNLight()
lightNode.light!.type = .omni
lightNode.position = SCNVector3(x: 0, y: 10, z: 10)
scene.rootNode.addChildNode(lightNode)
// create and add an ambient light to the scene
let ambientLightNode = SCNNode()
ambientLightNode.light = SCNLight()
ambientLightNode.light!.type = .ambient
ambientLightNode.light!.color = NSColor.darkGray
scene.rootNode.addChildNode(ambientLightNode)
// retrieve the ship node
let ship = scene.rootNode.childNode(withName: "ship", recursively: true)!
// animate the 3d object
ship.runAction(SCNAction.repeatForever(SCNAction.rotateBy(x: 0, y: 2, z: 0, duration: 1)))
// retrieve the SCNView
let scnView = SCNView()
return scnView
}
func updateNSView(_ scnView: SCNView, context: Context) {
scnView.scene = scene
// allows the user to manipulate the camera
scnView.allowsCameraControl = true
// show statistics such as fps and timing information
scnView.showsStatistics = true
// configure the view
scnView.backgroundColor = NSColor.black
if exploding {
if let ship = scene.rootNode.childNode(withName: "ship", recursively: true),
let particles = SCNParticleSystem(named: "Explosion", inDirectory: nil) {
let node = SCNNode()
node.addParticleSystem(particles)
node.position = ship.position
scnView.scene?.rootNode.addChildNode(node)
ship.removeFromParentNode()
}
}
}
}
Update: variant for iOS
Tested with Xcode 11.4 / iOS 13.4
Full module code (resource files as before at top level)
import SwiftUI
import SceneKit
struct DemoSceneKitParticles: View {
#State private var exploding = false
var body: some View {
VStack {
ScenekitView(exploding: $exploding)
Button("BOOM") { self.exploding = true }
}
}
}
struct ScenekitView : UIViewRepresentable {
#Binding var exploding: Bool
let scene = SCNScene(named: "ship.scn")!
func makeUIView(context: Context) -> SCNView {
// create and add a camera to the scene
let cameraNode = SCNNode()
cameraNode.camera = SCNCamera()
scene.rootNode.addChildNode(cameraNode)
// place the camera
cameraNode.position = SCNVector3(x: 0, y: 0, z: 15)
// create and add a light to the scene
let lightNode = SCNNode()
lightNode.light = SCNLight()
lightNode.light!.type = .omni
lightNode.position = SCNVector3(x: 0, y: 10, z: 10)
scene.rootNode.addChildNode(lightNode)
// create and add an ambient light to the scene
let ambientLightNode = SCNNode()
ambientLightNode.light = SCNLight()
ambientLightNode.light!.type = .ambient
ambientLightNode.light!.color = UIColor.darkGray
scene.rootNode.addChildNode(ambientLightNode)
// retrieve the ship node
let ship = scene.rootNode.childNode(withName: "ship", recursively: true)!
// animate the 3d object
ship.runAction(SCNAction.repeatForever(SCNAction.rotateBy(x: 0, y: 2, z: 0, duration: 1)))
// retrieve the SCNView
let scnView = SCNView()
return scnView
}
func updateUIView(_ scnView: SCNView, context: Context) {
scnView.scene = scene
// allows the user to manipulate the camera
scnView.allowsCameraControl = true
// show statistics such as fps and timing information
scnView.showsStatistics = true
// configure the view
scnView.backgroundColor = UIColor.black
if exploding {
if let ship = scene.rootNode.childNode(withName: "ship", recursively: true),
let particles = SCNParticleSystem(named: "Explosion", inDirectory: nil) {
let node = SCNNode()
node.addParticleSystem(particles)
node.position = ship.position
scnView.scene?.rootNode.addChildNode(node)
ship.removeFromParentNode()
}
}
}
}
struct DemeSKParticles_Previews: PreviewProvider {
static var previews: some View {
DemoSceneKitParticles()
}
}