scenekit

A recent question here made me think of SceneKit again, and I remembered a problem I never solved. My app displays antenna designs using SK. Most antennas use metal rods and mesh reflectors so I used SCNCylinder for the rods, SCNPlane for the reflector and SCNFloor for the ground. The whole thing took a couple of hours, and I'm utterly noob at 3D. But some antennas use wires bent into arcs or helixes, and I punted here and made crappy segmented objects using several cylinders end-to-end. It looks ass-tastic. Ideally I would like a single object that renders the arc or helix with a cylindrical

I am trying to project an ARAnchor to the 2D space but I am facing on an orientation issue... Below my function to project the top left, top right, bottom left, bottom right corner position to 2D space: /// Returns the projection of an `ARImageAnchor` from the 3D world space /// detected by ARKit into the 2D space of a view rendering the scene. /// /// - Parameter from: An Anchor instance for projecting. /// - Returns: An optional `CGRect` corresponding on `ARImageAnchor` projection. internal func projection(from anchor: ARImageAnchor, alignment: ARPlaneAnchor.Alignment, debug: Bool = false) -

I have tried to make a text string (SCNText) fit inside a box (SCNBox) in the code below. The size of the box looks correct but the text is not in the right center of the box. Any idea or solution? Thanks let geoText = SCNText(string: "Hello", extrusionDepth: 1.0) geoText.font = UIFont (name: "Arial", size: 8) geoText.firstMaterial!.diffuse.contents = UIColor.red let textNode = SCNNode(geometry: geoText) let (minVec, maxVec) = textNode.boundingBox scnScene.rootNode.addChildNode(textNode) let w = CGFloat(maxVec.x - minVec.x) let h = CGFloat(maxVec.y - minVec.y) let d = CGFloat(maxVec.z - minVec

The documentation for SCNMaterialProperty.contents states that it is an animatable property and indeed I can perform a crossfade between two colors. However I’m unable to crossfade between two images. So I’m starting to wonder if this is possible at all or if I need to create a custom shader for this? I’ve tried an implicit animation, in which case it immediately shows the ‘after’ image: node.geometry.firstMaterial.diffuse.contents = [UIImage imageNamed:@"before"]; [SCNTransaction begin]; [SCNTransaction setAnimationDuration:5]; node.geometry.firstMaterial.diffuse.contents = [UIImage

How to draw a border to highlight a SCNNode and indicate to user that the node is selected? In my project user can place multiple virtual objects and user can select any object anytime. Upon selection i should show the user highlighted 3D object. Is there a way to directly achieve this or draw a border over SCNNode? You need to add a tap gesture recognizer to the sceneView . // add a tap gesture recognizer let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTap(_:))) scnView.addGestureRecognizer(tapGesture) Then, handle the tap and highlight the node: @objc func

I've been reading plenty of StackOverflow answers on how to move an object by dragging it across the screen. Some use hit tests against .featurePoints some use the gesture translation or just keeping track of the lastPosition of the object. But honestly.. none work the way everyone is expecting it to work. Hit testing against .featurePoints just makes the object jump all around, because you dont always hit a featurepoint when dragging your finger. I dont understand why everyone keeps suggesting this. Solutions like this one work: Dragging SCNNode in ARKit Using SceneKit But the object doesnt