Question

我想使用Swift和SpriteKit为iOS重现Super-Mario。我使用SKPhysics-bodies来模拟玩家和环境之间的碰撞。玩家和所有对象都有自己的SKPhysicsBody（其大小的矩形）。但是当玩家跳过一块砖（从左上角或右上角）like this时，玩家就会陷入困境。

我的假设是，当两个SKSpriteNodes发生碰撞时，它们会重叠一点点。并且SKPhysics-Engine认为玩家位于中间砖的顶部，因为玩家在砖块上方有一点点，并且落在中间砖上。

所以我的问题是：如何防止SKSPriteNodes重叠？或者我该如何解决这个问题？

P.S。如果您需要更多信息，请告诉我！

编辑：砖类的一些代码：

import SpriteKit

class Brick: SKSpriteNode {

    let imgBrick = SKTexture(imageNamed: "Brick")

    init(let xCoor: Float, let yCoor: Float) {
        // position is a global variable wich is 1334/3840
        super.init(texture: imgBrick, color: UIColor.clearColor(), size: CGSize(width: 80*proportion, height: 80*proportion))
        position = CGPoint(x:Int(xCoor*667)+Int(40*proportion), y:Int(375-(yCoor*375))-Int(40*proportion))
        name = "Brick"
        physicsBody = SKPhysicsBody(rectangleOfSize: self.size)
        physicsBody?.affectedByGravity = false
        physicsBody?.dynamic = false
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

和我的玩家类

import SpriteKit

class Mario: SKSpriteNode {

    let atlas = SKTextureAtlas(named: "Mario")
    var imgMario = [SKTexture]()
    var action = SKAction()

    init(let xCoor: Float, let yCoor: Float) {
        for(var i = 1; i < 24; i++) {
           imgMario.append(atlas.textureNamed("X\(i)"))
        }

        super.init(texture: imgMario[0], color: UIColor.clearColor(), size: CGSize(width: 120*proportion, height: 160*proportion))
        position = CGPoint(x:Int(xCoor)+Int(60*proportion), y:Int(yCoor)-Int(90*proportion))
        name = "Mario"
        physicsBody = SKPhysicsBody(rectangleOfSize: self.size)
        physicsBody?.allowsRotation = false

        action = SKAction.repeatActionForever(SKAction.animateWithTextures(imgMario, timePerFrame: 0.03, resize: false, restore: true))
        runAction(action, withKey: "walking")
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}

和我的等级等级的一部分

class Level: SKScene, SKPhysicsContactDelegate {

    var motionManager = CMMotionManager()

    var mario = Mario(xCoor: 100, yCoor: 90)
    var world = SKSpriteNode()

    let MarioCategory: UInt32 = 0x1 << 0
    let BrickCategory: UInt32 = 0x1 << 1

    /*
    Some more code...
    */

    func setUpPhysics() {
        physicsWorld.contactDelegate = self
        mario.physicsBody!.categoryBitMask = marioCategory
        mario.physicsBody?.collisionBitMask = brickCategory
        mario.physicsBody?.contactTestBitMask = brickCategory

        for(var i = 0; i < world.children.count; i++) {
            if(world.children[i].name == "Brick") {
                world.children[i].physicsBody?.categoryBitMask = brickCategory
                world.children[i].physicsBody?.collisionBitMask = marioCategory
                world.children[i].physicsBody?.contactTestBitMask = marioCategory
                world.children[i].physicsBody?.friction = 0
            }
        }
    }
}

Answer 1

尝试将物理上的UsePreciseCollisionDetection设置为true。

mario.physicsBody?.usesPreciseCollisionDetection = true

https://developer.apple.com/reference/spritekit/skphysicsbody有一些例子。

通过将此属性设置为true，可以使其更准确地检测碰撞，因此只有在您的意思是这样时。我还重新考虑给每个块自己的物理体。您只关心一组块的边缘而不是每个块的边缘。

另一个建议是你可以根据纹理创建一个物理体。因此，如果您的SKSpriteNode具有带透明位的复杂纹理，您可以创建另一个仅仅是简单黑色块或类似纹理的纹理，这将有助于引擎检测更准确的碰撞。

防止两个SKSpriteNodes重叠

1 个答案: