realitykit

问题 I am not able to figure out how to make the "ball" entity a physics entity / body and apply a force to it. // I'm using UIKit for the user interface and RealityKit + // the models made in Reality Composer for the Augmented reality and Code import RealityKit import ARKit class ViewController: UIViewController { var ball: (Entity & HasPhysics)? { try? Entity.load(named: "golfball") as? Entity & HasPhysics } @IBOutlet var arView: ARView! // referencing the play now button on the home screen

问题 In SceneKit, there are lots of options such as Use alpha channel of UIColor via SCNMaterial.(diffuse|emission|ambient|...).contents Use SCNMaterial.transparency (a CGFloat from 0.0 to 1.0) Use SCNMaterial.transparent (another SCNMaterialProperty) Use SCNNode.opacity (a CGFloat from 0.0 (fully transparent) to 1.0 (fully opaque)) I wonder if there is a way to set transparency/opacity/alpha for ModelEntity in RealityKit? 回答1: At the moment I see at least one solution in RealityKit allowing you

问题 In SceneKit, there are lots of options such as Use alpha channel of UIColor via SCNMaterial.(diffuse|emission|ambient|...).contents Use SCNMaterial.transparency (a CGFloat from 0.0 to 1.0) Use SCNMaterial.transparent (another SCNMaterialProperty) Use SCNNode.opacity (a CGFloat from 0.0 (fully transparent) to 1.0 (fully opaque)) I wonder if there is a way to set transparency/opacity/alpha for ModelEntity in RealityKit? 回答1: At the moment I see at least one solution in RealityKit allowing you

问题 By setting the color of a material on the model property of a ModelEntity , I can alter the opacity/alpha of an object. But how do you animate this? My goal is to animate objects with full opacity, then have them fade to a set opacity, such as 50%. With SCNAction.fadeOpacity on a SCNNode in SceneKit , this was particularly easy. let fade = SCNAction.fadeOpacity(by: 0.5, duration: 0.5) node.runAction(fade) An Entity conforms to HasTransform , but that will only allow you to animate scale,

问题 There are three ways about Detecting Intersections in RealityKit framework, but I don't know how to use it in my project. 1. func raycast(origin: SIMD3<Float>, direction: SIMD3<Float>, length: Float, query: CollisionCastQueryType, mask: CollisionGroup, relativeTo: Entity?) -> [CollisionCastHit] 2. func raycast(from: SIMD3<Float>, to: SIMD3<Float>, query: CollisionCastQueryType, mask: CollisionGroup, relativeTo: Entity?) -> [CollisionCastHit] 3. func convexCast(convexShape: ShapeResource,

问题 There are three ways about Detecting Intersections in RealityKit framework, but I don't know how to use it in my project. 1. func raycast(origin: SIMD3<Float>, direction: SIMD3<Float>, length: Float, query: CollisionCastQueryType, mask: CollisionGroup, relativeTo: Entity?) -> [CollisionCastHit] 2. func raycast(from: SIMD3<Float>, to: SIMD3<Float>, query: CollisionCastQueryType, mask: CollisionGroup, relativeTo: Entity?) -> [CollisionCastHit] 3. func convexCast(convexShape: ShapeResource,

问题 Out of the box it's pretty clear ARKit doesn't allow for the tracking of more than 4 images at once. (You can "track" more markers than that but only 4 will function at a time). See this question for more details on that. However, I'm wondering if there is a possible work-around. Something like adding and removing anchors on a timer or getting the position information and then displaying the corresponding models without ARKit, etc. My knowledge of Swift is fairly limited so I haven't had much

问题 Out of the box it's pretty clear ARKit doesn't allow for the tracking of more than 4 images at once. (You can "track" more markers than that but only 4 will function at a time). See this question for more details on that. However, I'm wondering if there is a possible work-around. Something like adding and removing anchors on a timer or getting the position information and then displaying the corresponding models without ARKit, etc. My knowledge of Swift is fairly limited so I haven't had much

问题 I have written code to initialise one of 3 Reality Composer scenes when a button is pressed depending on the day of the month. That all works fine. The Reality Composer scenes use an image detection to place the objects within the environment but currently as soon as the image is out of the camera view the objects disappear. I would like to anchor the scene with the root node being where the image is first detected so that users can look around the scene and the objects are maintained even

问题 I have written code to initialise one of 3 Reality Composer scenes when a button is pressed depending on the day of the month. That all works fine. The Reality Composer scenes use an image detection to place the objects within the environment but currently as soon as the image is out of the camera view the objects disappear. I would like to anchor the scene with the root node being where the image is first detected so that users can look around the scene and the objects are maintained even