I have a spotlight, created with the code beneath, casting shadows on all of my nodes:
spotLight.type = SCNLightTypeSpot
spotLight.spotInnerAngle = 50.0
spotLight.spotOuterAngle = 150.0
spotLight.castsShadow = true
spotLight.shadowMode = SCNShadowMode.Deferred
spotlightNode.light = spotLight
spotlightNode.eulerAngles = SCNVector3(x: GLKMathDegreesToRadians(-90), y: 0, z: 0)
spotlightNode.position = levelData.coordinatesForGridPosition(column: 0, row: playerGridRow)
spotlightNode.position.y = 1.5
rootNode.addChildNode(spotlightNode)
The scene is moving along the z axis, and the camera has an infinite animation that makes it move:
let moveAction = SCNAction.moveByX(0.0, y: 0.0, z: CGFloat(-GameVariables.segmentSize / 2), duration: 2.0)
cameraContainerNode.runAction(SCNAction.repeatActionForever(moveAction))
As the camera moves though, the light doesn't, so after a while, the whole scene is dark. I want to move the light with the camera, however if I apply to the light node the same moving animation, all the shadows start to flicker. I tried to change the SCNShadowMode to Forward and the light type to Directional, but the flickering is still there. With directional, I actually loose most of my shadows. If I create a new light node later on, it will seem that I have two "suns", which of course is impossible. The final aim is simply to have an infinite light that shines parallel to the scene from the left, casting all the shadows to the right. Any ideas?
Build a node tree to hold both spotlight and camera.
Create, say, cameraRigNode as an SCNNode with no geometry. Create cameraContainerNode and spotlightNode the same way you are now. But make them children of cameraRigNode, not the scene's root node.
Apply moveAction to cameraRigNode. Both the camera and the light will now move together.
Related
I have created a scnbox in SceneKit and am trying to add a circular plane on the face that is touched by the user.
I can add the SCNPlane as a child node at the touch point using the hittest but I’m struggling to orient the plane to the face that was touched.
The localnormal vector provided as part of hit test seems to be what I need but I’m nit sure how to use it. Normally I would orient using the EulerAngles property but localnormal looks to be a vector. I tried Look(at:) which takes a vector3 but that didn’t seem to work.
Any suggestions would be gratefully received. Code sample below which is taken from touchesBegan. "result" is the SCNHitTestResult:
//Draw circular plane, double sided
let circle = SCNPlane(width: 0.1, height: 0.1) //SCNSphere(radius: 0.1)
circle.cornerRadius = 0.5
circle.materials.first?.diffuse.contents = UIColor.black
circle.materials.first?.isDoubleSided = true
let circleNode = SCNNode(geometry: circle)
//Set position to hit test
circleNode.position = result.localCoordinates
let lookAtPoint = SCNVector3(result.localNormal.x * 100, result.localNormal.y * 100, result.localNormal.z * 100)
//Align to far point on normal
circleNode.look(at: lookAtPoint)
//Add to touched node
result.node.addChildNode(circleNode)
I am currently making a Sprite and I want it to animate before it disappears.
For example: I want it to animate it in the sense that it disappears from the top of the block until the bottom. To put it another way, I want to the size to decrease slowly until there is nothing left. But I want to give it the appearance that it is disappearing rather than scaling to nothing.
let hand = SKSpriteNode(imageNamed: "hand")
hand.size = CGSize(width: size.width/10, height: size.height/30)
hand.position = CGPoint(x: CGFloat(posX-2)*size.width/10+offsetX, y:CGFloat(posY)*size.height/30+offsetY)
addChild(hand)
tl;dr is it possible to make this sort of effect using SpriteKit in Swift.
Ideal Animation: https://ibb.co/sPsffmK
SKAction is an animation that is executed by a node in the scene. Actions are used to change a node in some way (like move its position over time), but you can also use actions to change the scene, like doing a fadeout.
In your case, you can apply multiple animations:
let move_action = SKAction.moveBy(x: -100, y: 0, duration: 1.0)
let scale_action = SKAction.scale(to: 0.0, duration: 1.0)
let fade_action = SKAction.fadeAlpha(to: 0.0, duration: 1.0)
hand.run(move_action)
hand.run(scale_action)
//hand.run(fade_action)
In the previous example, the hand runs the move and scale animation at the same time. But you can also make the hand to move to the position, and after it reaches, to scale it.
let sequence = SKAction.sequence([move_animation,scale_animation])
hand.run(sequence)
There are lots of animations that SKAction has, here you can find the complete list.
I'm trying to make an ARKit application where an SCNNode, in this case a box, is placed in front of the camera, facing the camera. As the user moves the camera around, objects are placed when a certain distance has been moved. This would leave you with a series of nodes facing the camera in a line, equally spaced.
I have this working to a certain extent, but my problem is with the rotation. I'm currently taking all axes of rotation, so as the user re-orients their phone, the rotation of the node matches. I want to restrict this to just the rotation around the y-axis. The ideal outcome is a domino-trail like look, with all the objects having the same x and z rotations, but potentially different y rotations.
I hope I've explained this clearly enough!
Here's the code I'm currently using:
func createNode(fromCameraTransform cameraTransform: matrix_float4x4) -> SCNNode {
let geometry = SCNBox(width: 0.02, height: 0.04, length: 0.01, chamferRadius: 0)
let physicsBody = SCNPhysicsBody(type: .dynamic, shape: SCNPhysicsShape(geometry: geometry))
physicsBody.mass = 1000
let node = SCNNode(geometry: geometry)
node.physicsBody = physicsBody
var translationMatrix = matrix_identity_float4x4
translationMatrix.columns.3.x = 0.05 // Moves the node down in world space
translationMatrix.columns.3.z = -0.1 // Moves the object away from the camera
node.simdTransform = simd_mul(cameraTransform, translationMatrix)
return node
}
I've tried different combinations of extracting values from the second column of the cameraTransform and setting them as eulerAngles, rotation and simdRotation, but to no avail.
I've also tried extracting values from the pointOfView of the current sceneView and assigning them to the same values as listed above, but again, no luck.
Any help would greatly appreciated!
I know a little bit about this, but am really just starting out with SceneKit and 3D transformations/matrices so be gentle with me!
I think I know what your trying to do, basically automatically drop each new domino so its evenly spaced following the camera.pointOfView trail.
You can update the new nodes euler angles y-axis to the same as the cameras pointofView eularAngles.y. So as you move the camera around the next node you are placing is always facing towards the camera (only rotating around the y-axis).
The renderer function updateAtTime below gets called everytime
the camera moves
func renderer(_ renderer: SCNSceneRenderer, updateAtTime time: TimeInterval) {
// You set the camera’s pointOfView’s eularAngle for y-xis to the node you are
about to place.
node.eulerAngles.y = (sceneView.pointOfView?.eulerAngles.y)!
I had this working in a playground so it does work.
Edit: This solution above angle was having a gimbal lock problem (as you went around in a circle in would reset its angle back to the axis.
So I found this approach using SCNBillboardConstraint works without experiencing the gimbal lock problem as you go around in circle.
let yFreeConstraint = SCNBillboardConstraint()
yFreeConstraint.freeAxes = .Y
node.constraints = [yFreeConstraint]
node.eulerAngles = node.presentation.eulerAngles
node.position = position
I am very new to SceneKit and your help will be really appreciated!
I have a 200x200 sized SCNView in my UIView, which is at the centre of super view.
I want to put a SCNCylinder inside, such that the SCNCylinder covers full SCNView. I read that all these views of Scenekit are defined in meters, so how do I form a relationship between the dimensions of my screen and the
SCNCylinder.
I tried:
var coinNode = SCNNode()
let coinGeometry = SCNCylinder(radius: 100, height: 2)
coinNode = SCNNode(geometry: coinGeometry)
coinNode.position = SCNVector3Make(0, 0, 0)
coinScene.rootNode.addChildNode(coinNode)
let rotate90AboutZ = SCNAction.rotateByX(-CGFloat(M_PI_2), y: 0.0, z: CGFloat(M_PI_2), duration: 0.0)
coinNode.runAction(rotate90AboutZ)
ibOutletScene.scene = coinScene
But this leaves a margin between my coinScene and the ibOutletScene. How do I remove this space?
I also tried adding Camera:
let cameraNode = SCNNode()
cameraNode.camera = SCNCamera()
cameraNode.position = SCNVector3Make(0, 0, 100)
coinScene.rootNode.addChildNode(cameraNode)
But I see random behaviour with this and the coinNode gets hidden! How should I position my camera? Or is there any other way to remove extra space from my ibOutletScene?
Edit:
This is how it looks if I don't add camera. There is a margin between red scene and green coin. I tried multiple sizes for the coin, but I am unable to remove this margin unless I add a camera. But, If I add camera, I get another problem, mentioned below this screenshot.
If I don't add the camera, The rotation animation on coin works perfectly, but If I add camera,the rotation enlarges the and then becomes small again with the animation. How can I rotate it on its axis, without increasing the size?
I am using following code to rotate the coin:
The same code works fine without camera, but enlarges the coin after adding camera. Checkout the snapshot.
let rotate = SCNAction.rotateByX(0, y: -2 * CGFloat(M_PI_2), z: 0, duration: 2)
coinNode.runAction(rotate)
The random behavior might be caused by the last line in your first code snippet. You're starting an animation, and then adding the scene to the view.
Instead, build your scene, attach it to the view, and then start your animation. Setting a non-zero duration for the action will give you a more pleasing transition.
As for the extra space, it would help us understand if you post a screenshot. But you're going to have to do a bit of trigonometry.
It looks like you have a scene that you want to be blocked by a coin, that then rotates out of the way? Simulate that yourself with real objects. Put your eye down at the edge of your desk. Put a coin out a ways from your eye. How far does that coin have to be in order to block particular objects farther away on your desk?
In SceneKit, you can query the field of view of the SCNCamera. You know the size of your coin and the size of the view. Calculate the distance from the camera needed for the projected diameter of your coin to equal the width of your view. Put the coin there.
I am trying to display a shadow of my character on a map I have. I have a ambient light and an omni light. If I add a floor, it shows the shadow/reflection, but the floor covers the map.
Without a floor, I don't get any shadow/reflection.
I add floor like this:
floor = SCNFloor()
floor.reflectionFalloffEnd = 10
floor.reflectivity = 0.5
let floorNode = SCNNode(geometry: floor)
floorNode.position = SCNVector3(x: 0, y: -1.0, z: 0)
self.rootNode.addChildNode(floorNode)
The map is created with Mapbox iOS SDK (MGLMapView).
In your screenshots I don't see any shadow. I only see the reflection. For shadows you need either a directional or spot light. For the reflections over your map did you try to the the map texture to your SCNFloor? Another option is to use a SCNFloor with a material transparency of 0 but that will have a cost due to the overdraw.