scenekit

问题 So I have a bit of a project I am trying to do. I am trying to get the devices rotation relative to gravity, and translation from where it started. So basically getting "tracking" data for the device. I plan to basically apply this by making a 3d pt that will mimic the data I record from the device later on. Anyway to attempt to achieve this I thought it would be best to work with scene kit that way I can see things in 3 dimensions just like the data I am trying to record. Right now I have

问题 Am I missing something here? Amongst the various vector/matrix functions here, I can't see any function to simply apply an SCNMatrix4 transform to an SCNVector4. I could of course do it by writing out the matrix/vector multiplication longhand, but surely that can't be needed? The reason for this is that I'm updating the projection transform for a camera in two steps. First I need to apply one transform to the original transform, then I need to apply this transform to a vector in order to work

问题 I am displaying a 3d model consisting of several SNNodes in SceneKit. I am displaying a 2D SpriteKit node on the sceneview-overlay view. The 2D-node position should always be in front of a particular 3D SCNNode. How can I map the 3D position to the SpriteKit 2D position? I tried let screenPoint = sceneView.projectPoint(my3dNode) , but this doesn't work: even when the my3dNode is in the center of the screen, the function returns very weird values (e.g. negative values or over 1000). Do you

问题 I'm working with ARKit, I have trouble getting download progress from SCNScene url. This is my code: func downloadModel(hitTestResult: ARHitTestResult) { DispatchQueue.global().async { // create loading view // I WANT TO GET DOWNLOAD PROGRESS HERE let loading = UIAlertController(title: nil, message: "Please wait...\(downloadProgressValueHere)%", preferredStyle: .alert) let loadingIndicator = UIActivityIndicatorView(frame: CGRect(x: 10, y: 5, width: 50, height: 50)) loadingIndicator

问题 I've made a scn file called arrowsign.scn which contains a arrow like the picture below: I wrote a piece of code to load the arrow object: SCNNode *node = [SCNNode node]; SCNNode *a[10]; for (int i = 0;i<10;i++){ a[i] = [scene.rootNode childNodeWithName:@"arrowsign" recursively:NO];//just one arrow in arrowsign.scn a[i].scale = SCNVector3Make(0.15f, 0.15f, 0.15f); a[i].position = SCNVector3Make(1+i, 0, 0); [node addChildNode:a[i]]; } [scene.rootNode addChildNode:node]; Ideally there will be a

问题 I'm new to scenekit, so when I started my first project I noticed it's slightly different from spritekit. Although not ideal, I used to use 1 gameviewcontroller and 1 gamescene in spritekit to code my entire game. (YES, this includes a menu, game/levels, settings, etc...) I'm now wondering since I'm using SCNScenes (which are just loaded from the viewcontroller), I do not want my 1 view controller to be swamped with code. What is the best way to layout a game? Should i have 1 viewcontroller

问题 Please Help me, I have setup "allowsCameraControl = true" in Scene view. How to disabled some default functionality. 
 Ex : Pan with two fingers to translate the camera on its local xy-plane scnview.allowsCameraControl = true scnview.defaultCameraController.interactionMode = .orbitTurntable scnview.defaultCameraController.inertiaEnabled = true scnview.defaultCameraController.maximumVerticalAngle = 69 scnview.defaultCameraController.minimumVerticalAngle = -69 scnview.autoenablesDefaultLighting

问题 This should be an easy question import SceneKit import Accelerate var str:SCNVector3 = SCNVector3Make(1, 2, -8) println("vector \(str)" answer vector C.SCNVector3 How to unwrap and display the vector like [ 1, 2, -8]? 回答1: Update for Swift 2: In Swift 2, structures are by default printed with all properties: let str = SCNVector3Make(1, 2, -8) print("vector \(str)") // Output: // vector SCNVector3(x: 1.0, y: 2.0, z: -8.0) You can customize the output by adopting the CustomStringConvertible

问题 I'm trying to wrap my head around how to use SCNTechnique with Scenekit. The effect I'm trying to create can easily be achieved in Unity by adding a custom shader to two materials, making objects with the "filtered" shader to only be visible when it is seen through the other shader (the portal). I've followed this tutorial to create this in Unity: https://www.youtube.com/watch?v=b9xUO0zHNXw I'm trying to achieve the same effect in SceneKit, but I'm not sure how to apply the passes. I'm

问题 I have a question that about detecting touch in SceneKit. I have been able to find questions about how to detect when a certain object is touched but I need something a bit more specific. I need to be able to tell when a certain part of an object is touched. To explain a little better, I have a 3d model of a human and I need to be able to tell when say the head is touched or the leg is touched etc. If any further clarification is needed I would be glad to provide it, I'm just not quite sure