I want to detect collisions to every part of a sprite except for the transparent parts. I found a solution for C but I can't figure out how to do it in swift.
Here's the Obj-C solution:
sprite kit collisions: ignore transparency?
Anyone have any idea?
EDIT:
Here's my function code for building the shape. I'm not sure how to set spriteName.physicsBody to the answer supplied below by another user.
func addTriangles() {
center = SKSpriteNode(imageNamed:"images/center.png")
center.position = CGPoint(x: CGRectGetMidX(self.frame), y: CGRectGetMidY(self.frame))
center.zPosition = -1
center.physicsBody = init!(texture centerTexture: SKTexture!, size 1.0: CGSize) -> SKPhysicsBody?
center.physicsBody?.dynamic = false
center.physicsBody?.affectedByGravity = false
center.physicsBody?.categoryBitMask = PhysicsCategory.Triangle
self.addChild(center)
spin = clockwise
center.runAction(SKAction.repeatActionForever(spin))
}
You actually can use
init!(texture texture: SKTexture!, size size: CGSize) -> SKPhysicsBody?
to set up the collision body with the alpha channel of the texture of your sprite
However, this is not recommended because it costs a lot to simulate complicated shape's physics behaviour.
If you have a sprite with complicated shape, try to draw another simpler shape and use its texture as your physics body.
It's definitely a good idea to draw a separate more simplified image for physics body (from color and geometry stand point), as for the code, it's very close from what you need:
let birdMask: UInt32 = 0x1 << 0
let pipeMask: UInt32 = 0x1 << 1
//...
pipeImage = SKSpriteNode(imageNamed: "realImage")
//... size and position
let maskTexture = SKSpriteNode(imageNamed: mask)
maskTexture.size = pipeImage!.size // size of texture w/ real imageNamed
pipeImage!.physicsBody?.usesPreciseCollisionDetection = true
pipeImage!.physicsBody = SKPhysicsBody(texture: maskTexture.texture!, size: size)
pipeImage!.physicsBody?.affectedByGravity = false // disable falling down...
pipeImage!.physicsBody?.allowsRotation = false
pipeImage!.physicsBody?.isDynamic = true
pipeImage!.physicsBody?.friction = 0
pipeImage!.physicsBody?.categoryBitMask = pipeMask
pipeImage!.physicsBody?.collisionBitMask = birdMask | pipeMask
pipeImage!.physicsBody?.contactTestBitMask = birdMask | pipeMask
Here's the full guide how to make it
Related
I'm using Apple tutorial about face detection in vision kit in a live camera feed, not an image.
https://developer.apple.com/documentation/vision/tracking_the_user_s_face_in_real_time
It detects the face and adds some lines using CAShapeLayer to draw lines between different parts of the face.
fileprivate func setupVisionDrawingLayers() {
let captureDeviceResolution = self.captureDeviceResolution
let captureDeviceBounds = CGRect(x: 0,
y: 0,
width: captureDeviceResolution.width,
height: captureDeviceResolution.height)
let captureDeviceBoundsCenterPoint = CGPoint(x: captureDeviceBounds.midX,
y: captureDeviceBounds.midY)
let normalizedCenterPoint = CGPoint(x: 0.5, y: 0.5)
guard let rootLayer = self.rootLayer else {
self.presentErrorAlert(message: "view was not property initialized")
return
}
let overlayLayer = CALayer()
overlayLayer.name = "DetectionOverlay"
overlayLayer.masksToBounds = true
overlayLayer.anchorPoint = normalizedCenterPoint
overlayLayer.bounds = captureDeviceBounds
overlayLayer.position = CGPoint(x: rootLayer.bounds.midX, y: rootLayer.bounds.midY)
let faceRectangleShapeLayer = CAShapeLayer()
faceRectangleShapeLayer.name = "RectangleOutlineLayer"
faceRectangleShapeLayer.bounds = captureDeviceBounds
faceRectangleShapeLayer.anchorPoint = normalizedCenterPoint
faceRectangleShapeLayer.position = captureDeviceBoundsCenterPoint
faceRectangleShapeLayer.fillColor = nil
faceRectangleShapeLayer.strokeColor = UIColor.green.withAlphaComponent(0.7).cgColor
faceRectangleShapeLayer.lineWidth = 5
faceRectangleShapeLayer.shadowOpacity = 0.7
faceRectangleShapeLayer.shadowRadius = 5
let faceLandmarksShapeLayer = CAShapeLayer()
faceLandmarksShapeLayer.name = "FaceLandmarksLayer"
faceLandmarksShapeLayer.bounds = captureDeviceBounds
faceLandmarksShapeLayer.anchorPoint = normalizedCenterPoint
faceLandmarksShapeLayer.position = captureDeviceBoundsCenterPoint
faceLandmarksShapeLayer.fillColor = nil
faceLandmarksShapeLayer.strokeColor = UIColor.yellow.withAlphaComponent(0.7).cgColor
faceLandmarksShapeLayer.lineWidth = 3
faceLandmarksShapeLayer.shadowOpacity = 0.7
faceLandmarksShapeLayer.shadowRadius = 5
overlayLayer.addSublayer(faceRectangleShapeLayer)
faceRectangleShapeLayer.addSublayer(faceLandmarksShapeLayer)
rootLayer.addSublayer(overlayLayer)
self.detectionOverlayLayer = overlayLayer
self.detectedFaceRectangleShapeLayer = faceRectangleShapeLayer
self.detectedFaceLandmarksShapeLayer = faceLandmarksShapeLayer
self.updateLayerGeometry()
}
How can I fill inside the lines (different part of face) with a blurry view? I need to blur the face.
You could try placing a UIVisualEffectView on top of your video feed, and then adding a masking CAShapeLayer to that UIVisualEffectView. I don't know if that would work or not.
The docs on UIVisualEffectView say:
When using the UIVisualEffectView class, avoid alpha values that are less than 1. Creating views that are partially transparent causes the system to combine the view and all the associated subviews during an offscreen render pass. UIVisualEffectView objects need to be combined as part of the content they are layered on top of in order to look correct. Setting the alpha to less than 1 on the visual effect view or any of its superviews causes many effects to look incorrect or not show up at all.
I don't know if using a mask layer on a visual effect view would cause the same rendering problems or not. You'd have to try it. (And be sure to try it on a range of different hardware, since the rendering performance varies quite a bit between different versions of Apple's chipsets.)
You could also try using a shape layer filled with visual hash or a "pixellated" pattern instead of blurring. That would be faster and probably render more reliably.
Note that face detection tends to be a little jumpy. It might drop out for a few frames, or lag on quick pans or change of scene. If you're trying to hide people's faces in a live feed for privacy, it might not be reliable. It would only take a few un-blurred frames for somebody's identity to be revealed.
I'm trying to create a floating bubble view on my Watch App. The bubbles can collide & bounce off each other & the sides of the screen. But for some reason the bubbles are appearing out of the view bounds & getting stuck on the sides of the frame instead of bouncing off. This code works as expect on my iOS application but when using the same code in my Watch app, it doesn't.
It doesn't make much sense to me that this exact code works perfectly on my iOS app but not on the Watch App.
I'm passing the below code into a SpriteView in my SwiftUI View
let ballCategory: UInt32 = 0xb0001
let edgeCategory: UInt32 = 0xb0010
var nodeCount = 0
override func sceneDidLoad() {
//set physicsWorld properties
physicsWorld.contactDelegate = self
physicsWorld.gravity = CGVector(dx: 0.0, dy: 0.0)
//set edges as PhysicsBody
let edge = SKPhysicsBody(edgeLoopFrom: self.frame)
edge.friction = 0
edge.categoryBitMask = edgeCategory
self.physicsBody = edge
makebubble()
makebubble()
makebubble()
makebubble()
}
func makebubble() {
let bubbleTexture = SKTexture(imageNamed: "bubble")
let bubble = SKSpriteNode(texture: bubbleTexture)
let bphysicsBody = SKPhysicsBody(circleOfRadius: bubbleTexture.size().height/2)
bphysicsBody.isDynamic = true
bphysicsBody.usesPreciseCollisionDetection = true
bphysicsBody.restitution = 0.5
bphysicsBody.friction = 0
bphysicsBody.angularDamping = 0
bphysicsBody.linearDamping = 0
bphysicsBody.categoryBitMask = ballCategory
bphysicsBody.collisionBitMask = ballCategory | edgeCategory
bphysicsBody.contactTestBitMask = ballCategory | edgeCategory
bubble.physicsBody = bphysicsBody
bubble.name = "bubble"
// Get a random possition within the width of the scene
let x = CGFloat(randomize(number: Int(size.width - 40)))
let y = CGFloat(randomize(number: Int(size.height - 40)))
// position the bubble
bubble.position.x = x
bubble.position.y = y
// Add the bubble
addMyChild(node: bubble)
}
func addMyChild(node:SKSpriteNode){
self.addChild(node)
node.physicsBody!.applyImpulse(CGVector(dx: 10.0, dy: -2.0))
nodeCount += 1
}
// function that returns a random int from 0 to n-1
func randomize(number: Int) -> Int{
return Int(arc4random()) % number
}
This has nothing to to with watchOS and everything to do with the small screen size of Apple Watches. Try running your code on iOS with a frame modifier of width 150 and height 150 and you'll see what I mean; the bubbles will likely stick to the side.
Your bubbles look like they stick to the edges because they slow down over time (due to restitution being 0.5 instead of 1) and it's statistically more probable for a bubble to have its final movement close to the screen edge (since they will eventually move to the edge, bounce off from it, thus slowing down and eventually halting).
Here are 3 things you can do about this:
as mentioned, increase restitution to 1 (this is optional, as it won't solve the "sticking to the edge" problem on its own, but it helps making the slowing down issue better)
detect when the bubbles stop (you can do this by checking the x and y velocity in the update(_:) function of your SKScene) and make a force that moves them slightly in a random direction. If you are in a fancy mood, you can even make a timer to make random, barely noticable forces that act like small air movements (chances are, it will even make the animation a bit more realistic)
create an outside bounding box with slightly non-linear/circular borders and corners to make the bubbles bounce off the walls in a different way
I have a sprite that the user is able to move side to side by pressing on the left or right side of the screen. If you hold down on either side, the player sprite will leave the screen. I want to stop that from happening using physic bodies, but I can't seem to make it work.
To start, here are my categories.
//Categories for physics bodies
let sceneCategory:UInt32 = 0x1 << 0 // Equal to 1
let playerCategory:UInt32 = 0x1 << 1 // Equal to 2
Here is where I set the physics body of the scene itself.
self.physicsWorld.contactDelegate = self
self.physicsBody = SKPhysicsBody(edgeLoopFrom: self.frame)
self.physicsBody?.categoryBitMask = sceneCategory
self.physicsBody?.contactTestBitMask = playerCategory
self.physicsBody?.collisionBitMask = 0
self.physicsBody?.isDynamic = false
This is how I have the physics set for the player itself. I'm trying to set the physics body around the car itself. Is the way I have it setup the same as setting an alpha mask physics body?
let texture = SKTexture(imageNamed: "PorscheBlue")
player.physicsBody = SKPhysicsBody(texture: texture, size: player.size)
player.physicsBody?.isDynamic = false
player.physicsBody?.categoryBitMask = playerCategory
player.physicsBody?.contactTestBitMask = sceneCategory
player.physicsBody?.collisionBitMask = 0
Then, in the didBegin method, I just wanted it to print showing that the method was called. This isn't happening though for some reason.
func didBegin(_ contact: SKPhysicsContact)
{
print("called")
}
Why isn't the didBegin method being called? Do I have the physics set up properly? How can I make it so the player isn't allowed to leave the screen when moving?
Thank you
EDIT: So when having the physics boundaries visible, it looks like the boundaries for the scene are only being drawn on the top and bottom. I can't see any lines being drawn on the sides. That may be the issue, but I can't get it to show on the sides.
I resolved my issue by changing the dynamic value. I had both set to false, which causes the didBegin function to not be called. At least one of the nodes needs to be dynamic.
I'm trying to add a hitbox to the bottom of my player to only detect platforms. After a lot of trial and error I figured out to have an additional physicsbody attached as a child in a fixed position to another physicsbody I need to use an SKPhysicsJoint. I did this and it seems to have an unforeseen consequence. when I add the hitbox to the player in this way, it alters the players collision / contact bit masks slightly.
In my game you tap the screen to jump and it works seamlessly with no lag like so:
Player jumping
But when I add this hitbox with the joint I have to hold the screen with my finger and eventually the player jumps, but most of the time the input is ignored. Almost as if there's some sort of severe lag when reading the input.In this gif I'm tapping the screen constantly trying to make my player jump and a lot of the inputs are being ignored or blocked:
Player hitbox not behaving
This function setups up the player in my gamescene.swift and adds the hitbox to the player via a fixed SKPhysicsJoint to the scene:
func playerSetup(){
//setups player
addChild(player)
player.addChild(playerPlatformHitbox)
let myCGPoint = player.position // sets joint position
let myJoint = SKPhysicsJointFixed.joint(withBodyA: playerPlatformHitbox.physicsBody!, bodyB: player.physicsBody!, anchor: myCGPoint)
scene?.physicsWorld.add(myJoint)
}
And this is the hitbox class I made to only detect platforms for the player. you'll see it should ignore everything expect platforms from the bit masks. For some reason it's not allowing the player to accept contact with it's bit masks even though this hitbox and player arent touching:
import Foundation
import SpriteKit
class PlayerPlatformHitbox: SKSpriteNode{
init() {
super.init(texture: nil, color: SKColor.blue, size: CGSize(width: playerTexture.size().width, height: 10))
physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: self.size.width, height: self.size.height))
position = CGPoint(x:0, y: (-playerTexture.size().height * 0.6))
physicsBody?.categoryBitMask = CollisionTypes.jumpHitBox.rawValue
physicsBody?.contactTestBitMask = CollisionTypes.platform.rawValue
physicsBody?.collisionBitMask = CollisionTypes.platform.rawValue
physicsBody?.restitution = 0.0
physicsBody?.friction = 0.0
zPosition = 20
physicsBody?.linearDamping = 0.0
physicsBody?.angularDamping = 0.0
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)}
}
And this is my player class
class Player: SKSpriteNode {
init() {
super.init(texture: nil, color: SKColor.clear, size: playerTexture.size())
//starts accelerameter
motionManager = CMMotionManager()
motionManager.startAccelerometerUpdates()
physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: playerTexture.size().width,
height: playerTexture.size().height))
physicsBody?.categoryBitMask = CollisionTypes.player.rawValue
physicsBody?.contactTestBitMask = CollisionTypes.memoryModule.rawValue | CollisionTypes.spikes.rawValue | CollisionTypes.finish.rawValue | CollisionTypes.enemy.rawValue | CollisionTypes.ground.rawValue
physicsBody?.collisionBitMask = CollisionTypes.ground.rawValue | CollisionTypes.sceneEdge.rawValue
physicsBody?.affectedByGravity = true
physicsBody?.restitution = 0.0
physicsBody?.friction = 0.3
physicsBody?.isDynamic = true
//physicsBody?.friction = 0.0
physicsBody?.allowsRotation = false
setScale(0.65)
zPosition = 1
physicsBody?.linearDamping = 0.0
physicsBody?.angularDamping = 0.0
animateWalk()
}
The goal of all this is to use the hitbox to detect platforms instead of the player in this function I have in my update method:
//jump through platform check
if let body = player.physicsBody {
let dy = body.velocity.dy
if dy > 0{
// Prevent collisions if the hero is jumping
body.collisionBitMask &= ~CollisionTypes.platform.rawValue
body.contactTestBitMask &= ~CollisionTypes.platform.rawValue
}
else {
// Allow collisions if the hero is falling
body.collisionBitMask |= CollisionTypes.platform.rawValue
body.contactTestBitMask |= CollisionTypes.platform.rawValue
}
}
and the only reason I need to do this is because when the player is falling, if he falls and hits the side of the platform he will stop and slide down it because collisions are back on and the players physicsbody is a square.
If i can use the platform detection hitbox to detect the platforms instead of the players bulky hitbox it will get rid of this issue.
Thanks for any and all advice.
EDIT: this is the childs behavior with a physics body and no joint:
Odd behavior
I found the solution.
It seems there's some bugs with fixed joints and the answer was to use a "pin" joint instead. This StackO question goes into detail about a rotation bug with fixed joints. On a whim I decided to change my fixed joint to a pin and now the child behaves as you would expect, positionally speaking anyway.
So it appears fixed joints have a few bugs that need to be worked out.
I have a node named "user" and it runs an animation through user.atlas constantly. It is also pixel art (18x50) and I need it to stay looking sharp and how I designed it. If I remove the action and add
user.texture?.filteringMode = .Nearest
it looks sharp and clear and perfect - but as soon as I add the action, the texture don't seem to want to follow that rule.
Also!
The image is stretched, even if I set the size to (18 , 50) it still is stretched vertically and the pixels are longer than they are wide. This problem persists no matter the animation.
Anyone have any ideas? Thanks.
You should set filtering mode of the textures before you add to the sprite.
Here is an example:
// this creates a walking character with endless loop
// create textures of the sprite
let frame1 : SKTexture = SKTexture.init(imageNamed: "walk-left-1")
let frame2 : SKTexture = SKTexture.init(imageNamed: "walk-left-2")
let frame3 : SKTexture = SKTexture.init(imageNamed: "walk-left-3")
let frame4 : SKTexture = SKTexture.init(imageNamed: "walk-left-4")
// set filter for pixelart
frame1.filteringMode = .nearest
frame2.filteringMode = .nearest
frame3.filteringMode = .nearest
frame4.filteringMode = .nearest
// create the textures array
let walkFrames = [frame1, frame2, frame3, frame4]
// create sprite and add to the scene
let sprite = SKSpriteNode.init(texture: walkFrames[0])
sprite.position = CGPoint(x: self.frame.midX, y: self.frame.midY)
self.addChild(sprite)
// create the walking animation
let animate = SKAction.animate(with: walkFrames, timePerFrame: 0.2)
//OPTIONAL: make sprite bigger if you need
sprite.setScale(4)
// start walking
sprite.run(SKAction.repeatForever(animate))