I wonder how this to be done . Please do not close this question I need suggestion or any hint to implement it.
Source https://www.youtube.com/watch?v=4uHyHRKmxZk
I have created A node which is SCNCylinder and drawn from target to the centre of the screen from updateAtTime method
Firstly I thought it was drawn with TextNode. SO I tried following
Inside that class I have method help to draw a node at each Unit I pass to UnitLength
func drawOtherBaseUnit(height:Float,intoThe unitType:UnitLength,toTheNode zAxisNode:SCNNode) {
print("---------------------------------------------------------------------")
let distanceInTarget = Converter.convert(value: Double(height), to: unitType).output + 1
print("DISTANCE",distanceInTarget)
print("---------------------------------------------------------------------")
var text = ""
switch unitType {
case .inches:
text = "INCH"
case .centimeters:
text = "CM"
default:
return
}
if !distanceInTarget.isNaN {
var distance = Int(distanceInTarget)
var i = 0
while distance > 0 {
print("distance ",distance)
let node = UnitNode(withPosition: SCNVector3Make(0, 0, 0), radius: CGFloat(Converter.convert(value: 0.1, from: unitType, to: UnitLength.meters).output),text:"\(text) \(i)",forType:unitType)
let valueIncreaseOnAsPerTarget = Int(distanceInTarget) - distance
let valueToIncreaseMeter = Converter.convert(value: Double(valueIncreaseOnAsPerTarget), from: unitType, to: UnitLength.meters).output
node.position.y = -Float(valueToIncreaseMeter)
node.position.x = 0
zAxisNode.addChildNode(node)
distance -= 1
i += 1
}
}
}
The UnitNode class is draw SCNText and some other nodes.
This is working fine. I can see node each provided unit.
But it if I use drawOtherBaseUnit for Inch as well as CM UI is Lagging it is not smooth.
Is it correct way to implement desired output ?
Related
I am stuck on a problem. I need to apply transformation (scale, rotation, position) right after i add model to my rootNode. Right after when i apply transformation on child model added to rootNode it shows fine on screen but when i apply transformation on rootNode it doesn't refresh. i experimented that as soon i touch screen UI updates. I also tried putting delay of 2,3 secs.
expected
UIView should update as soon i apply transformation to rootNode.
let res = SCNAction.repeatForever(SCNAction.rotateBy(x: 0, y: 0.5, z: 0, duration: 1))
// let res = SCNAction.sequence([SCNAction.wait(duration: 2000), SCNAction.rotateTo(x: CGFloat(180), y: CGFloat(90), z: CGFloat(0), duration: 1.0)])
self.rootNode.runAction(res)
i tried putting code in
RunLoop.main.perform {}
i tried using
scnView.preferredFramesPerSecond = 30
scnView.rendersContinuously = true
But none works. i am using sdk IOS 13.2. Any help please.
Edit:
var rootNode = SCNNode()
viewDidload(){
scnScene.rootNode.addChildNode(rootNode)
....
}
func initSceneWithModel(modelURL: URL) {
do {
try personModel = addModel(url: modelURL)
menuButton.setImage(UIImage.fontAwesomeIcon(name: .bars, style: .solid, textColor: .white, size: XConstants.FONT_AWSOME_SIZE), for: .normal)
selectedModel = personModel
centerPivot(for: personModel!)
moveNodeToCenter(node: personModel!)
setupEyeBlocker()
// selectedModel = eyeBlocker
updateFieldUI()
DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
self.applyInitTransformations()
}
} catch let error {
Utilities.xalert(inView: self.view, desc: error.localizedDescription)
}
}
func applyInitTransformations() {
if let info = vm.physicialFile.extraInfo {
// personModel?.position = info.person.position
// personModel?.scale = info.person.scale
// personModel?.eulerAngles = info.person.rotation
var valueRotPos = SCNMatrix4Mult(SCNMatrix4MakeRotation(0,0,0,0), SCNMatrix4MakeTranslation(0,0,0))
var valueScale = SCNMatrix4MakeScale(7.0,7.0,7.0) // scales to 0.1 of original size
rootNode.transform = SCNMatrix4Mult(valueRotPos, valueScale)
// rootNode.position = info.root.position
// rootNode.scale = info.root.scale
// rootNode.eulerAngles = info.root.rotation
}
else {
applyEyeBlockerDefaultPosition()
}
}
Apple clearly says:
...
You should not modify the transform property of the root node.
...
(https://developer.apple.com/documentation/scenekit/scnscene/1524029-rootnode)
This might be causing the issues you have with your scene. Avoid SCNActions to be run on the rootNode. They are designed to run on the content of the rootNode (any SCNNode added to the rootNode).
You could probably take a common SCNNode, call it like myRootNode, add it to the real rootNode and add all your other content to myRootNode. Transformations should then apply correctly to all your sub-content, if this is your goal.
BTW: scnView.preferredFramesPerSecond = 30 never gave me more performence or any benefits. Leave it default. Scenekit switches automatically to lower framerates if required.
EDIT:
apply transformation like so:
// Precalculate the Rotation the Position and the Scale
var valueRotPos = SCNMatrix4Mult(SCNMatrix4MakeRotation(0,0,0,0), SCNMatrix4MakeTranslation(0,0,0))
var valueScale = SCNMatrix4MakeScale(0.1,0.1,0.1) // scales to 0.1 of original size
then you do:
myRootNode.transform = SCNMatrix4Mult(valueRotPos, valueScale)
(you could also try to use the worldTransform of the node or the other transform properties of the nodes presentation node-object)
How can i check if two SKSpriteNodes are near each other? like in a radius of 100. i am using the gamescene.swift and gamescene.sks.
SKSpriteNode has a position property with the (x, y).
Distance between two positions is sqrt((x1-x2)^2 + (y1-y2)^2)
So:
let dist = sqrt(pow(sk1.position.x - sk2.position.x, 2.0) + pow(sk1.position.y - sk2.position.y, 2.0))
if dist < 100 {
// they are close
}
This is center to center.
Based on #MartinR's comment, you could also
let dist = hypot(sk1.position.x - sk2.position.x, sk1.position.y - sk2.position.y)
Which does the distance function for you.
If you want to use built in SKPhysicsBody, then just set the body to a circle with radius of 100, then you can use the didBeginContact method when a contact occurs:
func setup()
{
let physicsBody1 = SKPhysicsBody(circleOfRadius:100.0)
physicsBody1.categoryBitMask = 1
physicsBody1.collisionBitMask = 0
physicsBody1.contactTestBitMask = 2
sprite1.physicsBody = physicsBody1
let physicsBody2 = SKPhysicsBody(circleOfRadius:100.0)
physicsBody2.categoryBitMask = 2
physicsBody2.collisionBitMask = 0
physicsBody2.contactTestBitMask = 1
sprite2.physicsBody = physicsBody2
}
func didBeginContact(contact:SKPhysicsContact)
{
//find some tutorials to your liking, and do your contact code here
}
I have created some particles animations with specific sprites which works fine if I use them in the function:
override init(size: CGSize)
I use the following lines:
let sheet_particles = Particles()
let particles_node = SKSpriteNode(texture: sheet_particles.particle000())
particles_node.name = kparticles
particles_node.position = CGPoint(x: 500, y: 500)
particles_node.zPosition = 5
background.addChild(particles_node)
particles_node.runAction(particlesAction)
To make them appear in my scene.
The problem I have is if I try to use them in other functions in my scene, I can not see them.
func panForTranslation(translation : CGPoint) {
let position = selectedNode.position
if selectedNode.name! == kpuzzleNodeName {
selectedNode.position = CGPoint(x: position.x + translation.x * 2, y: position.y + translation.y * 2)
switch selectedNode.name2 {
case "0":
if selectedNode.frame.intersects(NPuzzle13.frame) {
particles_node.position = selectedNode.position
particles_node.runAction(particlesAction)
NPuzzle13.hidden = false
selectedNode.removeFromParent()
}
I see no particles sprite when the condition "0" happens but I see correctly the NPuzzle13. When I check the position of the particles_node node, its position is equal with the node selectedNode. All that is OK, except for the visibility of the particles... What am I missing? Thanks.
About zPosition seems all correct. I dont see any anchorPoint in your code.
I think your switch-case is jumped (not fired, not executed) because you check switch selectedNode.name2 instead of switch selectedNode.name
I want to create a particle system on iOS using sprite kit where I define the colour of each individual particle. As far as I can tell this isn't possible with the existing SKEmitterNode.
It seems that best I can do is specify general behaviour. Is there any way I can specify the starting colour and position of each particle?
This can give you a basic idea what I was meant in my comments. But keep in mind that it is untested and I am not sure how it will behave if frame rate drops occur.
This example creates 5 particles per second, add them sequentially (in counterclockwise direction) along the perimeter of a given circle. Each particle will have different predefined color. You can play with Settings struct properties to change the particle spawning speed or to increase or decrease number of particles to emit.
Pretty much everything is commented, so I guess you will be fine:
Swift 2
import SpriteKit
struct Settings {
static var numberOfParticles = 30
static var particleBirthRate:CGFloat = 5 //Means 5 particles per second, 0.2 means one particle in 5 seconds etc.
}
class GameScene: SKScene {
var positions = [CGPoint]()
var colors = [SKColor]()
var emitterNode:SKEmitterNode?
var currentPosition = 0
override func didMoveToView(view: SKView) {
backgroundColor = .blackColor()
emitterNode = SKEmitterNode(fileNamed: "rain.sks")
if let emitter = emitterNode {
emitter.position = CGPoint(x: CGRectGetMidX(frame), y: CGRectGetMidY(frame))
emitter.particleBirthRate = Settings.particleBirthRate
addChild(emitter)
let radius = 50.0
let center = CGPointZero
for var i = 0; i <= Settings.numberOfParticles; i++ {
//Randomize color
colors.append(SKColor(red: 0.78, green: CGFloat(i*8)/255.0, blue: 0.38, alpha: 1))
//Create some points on a perimeter of a given circle (radius = 40)
let angle = Double(i) * 2.0 * M_PI / Double(Settings.numberOfParticles)
let x = radius * cos(angle)
let y = radius * sin(angle)
let currentParticlePosition = CGPointMake(CGFloat(x) + center.x, CGFloat(y) + center.y)
positions.append(currentParticlePosition)
if i == 1 {
/*
Set start position for the first particle.
particlePosition is starting position for each particle in the emitter's coordinate space. Defaults to (0.0, 0,0).
*/
emitter.particlePosition = positions[0]
emitter.particleColor = colors[0]
self.currentPosition++
}
}
// Added just for debugging purposes to show positions for every particle.
for particlePosition in positions {
let sprite = SKSpriteNode(color: SKColor.orangeColor(), size: CGSize(width: 1, height: 1))
sprite.position = convertPoint(particlePosition, fromNode:emitter)
sprite.zPosition = 2
addChild(sprite)
}
let block = SKAction.runBlock({
// Prevent strong reference cycles.
[unowned self] in
if self.currentPosition < self.positions.count {
// Set color for the next particle
emitter.particleColor = self.colors[self.currentPosition]
// Set position for the next particle. Keep in mind that particlePosition is a point in the emitter's coordinate space.
emitter.particlePosition = self.positions[self.currentPosition++]
}else {
//Stop the action
self.removeActionForKey("emitting")
emitter.particleBirthRate = 0
}
})
// particleBirthRate is a rate at which new particles are generated, in particles per second. Defaults to 0.0.
let rate = NSTimeInterval(CGFloat(1.0) / Settings.particleBirthRate)
let sequence = SKAction.sequence([SKAction.waitForDuration(rate), block])
let repeatAction = SKAction.repeatActionForever(sequence)
runAction(repeatAction, withKey: "emitting")
}
}
}
Swift 3.1
import SpriteKit
struct Settings {
static var numberOfParticles = 30
static var particleBirthRate:CGFloat = 5 //Means 5 particles per second, 0.2 means one particle in 5 seconds etc.
}
class GameScene: SKScene {
var positions = [CGPoint]()
var colors = [SKColor]()
var emitterNode: SKEmitterNode?
var currentPosition = 0
override func didMove(to view: SKView) {
backgroundColor = SKColor.black
emitterNode = SKEmitterNode(fileNamed: "rain.sks")
if let emitter = emitterNode {
emitter.position = CGPoint(x: frame.midX, y: frame.midY)
emitter.particleBirthRate = Settings.particleBirthRate
addChild(emitter)
let radius = 50.0
let center = CGPoint.zero
for var i in 0...Settings.numberOfParticles {
//Randomize color
colors.append(SKColor(red: 0.78, green: CGFloat(i * 8) / 255.0, blue: 0.38, alpha: 1))
//Create some points on a perimeter of a given circle (radius = 40)
let angle = Double(i) * 2.0 * Double.pi / Double(Settings.numberOfParticles)
let x = radius * cos(angle)
let y = radius * sin(angle)
let currentParticlePosition = CGPoint.init(x: CGFloat(x) + center.x, y: CGFloat(y) + center.y)
positions.append(currentParticlePosition)
if i == 1 {
/*
Set start position for the first particle.
particlePosition is starting position for each particle in the emitter's coordinate space. Defaults to (0.0, 0,0).
*/
emitter.particlePosition = positions[0]
emitter.particleColor = colors[0]
self.currentPosition += 1
}
}
// Added just for debugging purposes to show positions for every particle.
for particlePosition in positions {
let sprite = SKSpriteNode(color: SKColor.orange, size: CGSize(width: 1, height: 1))
sprite.position = convert(particlePosition, from: emitter)
sprite.zPosition = 2
addChild(sprite)
}
let block = SKAction.run({
// Prevent strong reference cycles.
[unowned self] in
if self.currentPosition < self.positions.count {
// Set color for the next particle
emitter.particleColor = self.colors[self.currentPosition]
// Set position for the next particle. Keep in mind that particlePosition is a point in the emitter's coordinate space.
emitter.particlePosition = self.positions[self.currentPosition]
self.currentPosition += 1
} else {
//Stop the action
self.removeAction(forKey: "emitting")
emitter.particleBirthRate = 0
}
})
// particleBirthRate is a rate at which new particles are generated, in particles per second. Defaults to 0.0.
let rate = TimeInterval(CGFloat(1.0) / Settings.particleBirthRate)
let sequence = SKAction.sequence([SKAction.wait(forDuration: rate), block])
let repeatAction = SKAction.repeatForever(sequence)
run(repeatAction, withKey: "emitting")
}
}
}
Orange dots are added just for debugging purposes and you can remove that part if you like.
Personally I would say that you are overthinking this, but I might be wrong because there is no clear description of what you are trying to make and how to use it. Keep in mind that SpriteKit can render a bunch of sprites in a single draw call in very performant way. Same goes with SKEmitterNode if used sparingly. Also, don't underestimate SKEmitterNode... It is very configurable actually.
Here is the setup of Particle Emitter Editor:
Anyways, here is the final result:
Note that nodes count comes from an orange SKSpriteNodes used for debugging. If you remove them, you will see that there is only one node added to the scene (emitter node).
What you want is completely possible, probably even in real time. Unfortunately to do such a thing the way you describe with moving particles as being a particle for each pixel would be best done with a pixel shader. I don't know of a clean method that would allow you to draw on top of the scene with a pixel shader otherwise all you would need is a pixel shader that takes the pixels and moves them out from the center. I personally wouldn't try to do this unless I built the game with my own custom game engine in place of spritekit.
That being said I'm not sure a pixel per pixel diffusion is the best thing in most cases. Expecially if you have cartoony art. Many popular games will actually make sprites for fragments of the object they expect to shader. So like if it's an airplane you might have a sprite for the wings with perhaps even wires hanging out of this. Then when it is time to shatter the plane, remove it from the scene and replace the area with the pieces in the same shape of the plane... Sorta like a puzzle. This will likely take some tweaking. Then you can add skphysicsbodies to all of these pieces and have a force push them out in all directions. Also this doesn't mean that each pixel gets a node. I would suggest creatively breaking it into under 10 pieces.
And as whirlwind said you could all ways get things looking "like" it actually disintegrated by using an emitter node. Just make the spawn area bigger and try to emulate the color as much as possible. To make the ship dissappear you could do a fade perhaps? Or Mabye an explosion sprite over it? Often with real time special effects and physics, or with vfx it is more about making it look like reality then actually simulating reality. Sometimes you have to use trickery to get things to look good and run real-time.
If you want to see how this might look I would recommend looking at games like jetpac joyride.
Good luck!
I can't seem to figure out how to constrain the Z-value of a node using SCNTransformConstraint. Here's what I have so far.
let constraint = SCNTransformConstraint(inWorldSpace: true, withBlock:{
node, matrix in
var newMatrix = matrix
let currentNode = node as SCNNode
if (currentNode.presentationNode().position.z > 0.0) {
newMatrix.m43 = 0.0
}
return newMatrix
})
ship.constraints = [constraint]
With the above constraint, ship doesn't move when I apply a force to its physicsBody. Any help would be greatly appreciated.
Yeah. This one stumped me for a bit, too.
The issue is with the matrix. According the the Developer documentation concerning the SCNMatrix4 (matrix) argument:
If the node is affected by an in-progress animation, this value reflects the currently visible state of the node during the animation (rather than its target state that will be visible when the animation completes).
Instead of this:
var newMatrix = matrix
You really want:
var newMatrix = node.transform
which appears to be the current transform about to be applied to the node.
I know this is an old question, but this was near the top of search results for SCNTransformConstraint. Hey, better late than never, right?
This worked for me to constrain a SCNCameraController to the boundaries of a grid:
let constraint = SCNTransformConstraint.positionConstraint(inWorldSpace: false, with: { (node, position) -> SCNVector3 in
var constrainedPosition = position
if position.x < gridMinX {constrainedPosition.x = gridMinX; node.position.x = gridMinX}
if position.x > gridMaxX {constrainedPosition.x = gridMaxX; node.position.x = gridMaxX}
if position.z < gridMinZ {constrainedPosition.z = gridMinZ; node.position.z = gridMinZ}
if position.z > gridMaxZ {constrainedPosition.z = gridMaxZ; node.position.z = gridMaxZ}
return constrainedPosition
})
sceneView.pointOfView?.constraints = [constraint]