scenekit

I'm seeing very inconsistent frame rates in the SceneKit starter project. Sometimes it runs constantly at 60 fps (12ms rendering, 6ms metal flush), and sometimes it runs constantly at 40 fps (20ms rendering, 6ms metal flush), no more, no less. The frame rate changes randomly when I reopen the app, and will stay at that frame rate until the next reopen. I tried switching to OpenGL ES, and while it seems to fix it in the starter project, I still see those drops in my real app. The starter project is unmodified (rotating ship), and I'm testing it on Xcode 7.0 and iPad Mini 4 running iOS 9.0.1. I

I have a scene setup with SCNCamera that rotates around an object. What would be the best way to limit the extents of rotation the camera can achieve around the object? Example: instead of being able to rotate around a whole sphere, how would I limit rotation to a single hemisphere? My first attempt was to see if there was any clamps for .allowsCameraControl. Could not find anything. I then tried adapting c# Unity : mouse orbit script , no luck. Some pointers on how to approach or solve this would great. Boilerplate Arcball thanks to this answer. var lastWidthRatio: Float = 0 var

I have a simple SCNNode in ARKit and I am trying to drag it wherever I moved my finger on the phone. Here is my code. @objc func pan(recognizer :UIGestureRecognizer) { guard let currentFrame = self.sceneView.session.currentFrame else { return } var translation = matrix_identity_float4x4 translation.columns.3.z = -1.5 let sceneView = recognizer.view as! ARSCNView let touchLocation = recognizer.location(in: sceneView) let hitTestResult = sceneView.hitTest(touchLocation, options: [:]) if !hitTestResult.isEmpty { print("hit result") guard let hitResult = hitTestResult.first else { return } let

I'm new to iOS development and I've got myself stumped. I am trying to render a cube using SceneKit that has a different colour for each face. This is what I've got so far: func sceneSetup() { // 1 let scene = SCNScene() // 2 let BoxGeometry = SCNBox(width: 0.9, height: 0.9, length: 0.9, chamferRadius: 0.0) BoxGeometry.firstMaterial?.diffuse.contents = UIColor.redColor() let cube = SCNNode(geometry: BoxGeometry) cube.position = SCNVector3(x: 0, y: 0, z: -1) scene.rootNode.addChildNode(cube) // 3 sceneView.scene = scene sceneView.autoenablesDefaultLighting = true sceneView.allowsCameraControl =

Having made some progress in the geometry side of things I'm moving on to putting together an entire scene. That scene has a couple dozen objects, each defined by a bounding cube whose corners are specified by two SCNVector3s (originally two sets of x,y,z). Here's an example of what I have so far - it's an 11-element log-periodic antenna, like the old school TV antennas from the 70s. Each of the grey lines is an "element", typically made of aluminum rod. I used SCNCylinders from +ve to -ve Y and the entire thing is less than 100 lines (SK is pretty amazing). The problem is what happens if the

I am trying to load animations created in Cheetah 3D and Blender 3D into Scene Kit, but all I get is a bunch of "untitled-animations" with each one being the same animation. Does anyone know how to properly export these from Blender or Cheetah 3D so that Scene Kit can use them? FlippinFun I dug into this because it was annoying me too. All of the "untitled animations" are individual animations for each bone. You can get the id from the attributes inspecter in the panel on the right side of xcode. Using swift like so, you can get your animation. let urlOfScene = Bundle.main.url(forResources: