swift - 如何在 SceneKit 中的 GKComponent 中检测两个 GKEntities(SCNNodes) 之间的 SCNPhysics 交集

Question

我正在尝试检测 SceneKit 中两个 scnnode 的交集。它们注册为 GKEntities。我想将一个组件关联到两个实体，这两个实体将使用 SCNPhysicsContactDelegate 检测其物理体的交集，但我不想在 View Controller 中执行此操作，因为我知道这不是最佳实践，并且会导致注册变得困难作为一个组件。任何帮助将不胜感激。

感谢您的帮助，

蒙特勒

import Foundation
import SpriteKit
import GameplayKit
import SceneKit

class MeleeComponent: GKComponent, SCNPhysicsContactDelegate {

 let damage: CGFloat
 let destroySelf: Bool
 let damageRate: CGFloat
 var lastDamageTime: TimeInterval
 let aoe: Bool
 //  let sound: SKAction
   let entityManager: EntityManager
   init(damage: CGFloat, destroySelf: Bool, damageRate: CGFloat, aoe:      Bool, entityManager: EntityManager) {
 self.damage = damage
self.destroySelf = destroySelf
self.damageRate = damageRate
self.aoe = aoe
 //    self.sound = sound
self.lastDamageTime = 0
self.entityManager = entityManager
super.init()
 }

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


 override func update(deltaTime seconds: TimeInterval) {

super.update(deltaTime: seconds)

// Get required components
guard let teamComponent = entity?.component(ofType: TeamComponent.self),
          let spriteComponent = entity?.component(ofType: SpriteComponent.self) else {
  return
}

// Loop through enemy entities
var aoeDamageCaused = false
let enemyEntities = entityManager.entitiesForTeam(teamComponent.team.oppositeTeam())
for enemyEntity in enemyEntities {

  // Get required components
  guard let enemySpriteComponent = enemyEntity.component(ofType: SpriteComponent.self),
        let enemyHealthComponent = enemyEntity.component(ofType: HealthComponent.self) else {
    continue
  }

  // Check for intersection

  if       (spriteComponent.node.frame.intersects(enemySpriteComponent.node.frame)) {

    // Check damage rate
    if (CGFloat(CACurrentMediaTime() - lastDamageTime) > damageRate) {

      // Cause damage
//          spriteComponent.node.parent?.run(sound)
      if (aoe) {
        aoeDamageCaused = true
      } else {
        lastDamageTime = CACurrentMediaTime()
      }

      // Subtract health
      enemyHealthComponent.takeDamage(damage)

      // Destroy self
      if destroySelf {
        entityManager.remove(entity!)
      }
    }
  }
}

if (aoeDamageCaused) {
  lastDamageTime = CACurrentMediaTime()
}

} }

Answer 1

在 SCNPhysicsWorld 中，有一些 API 可以帮助您。

比如

 func contactTestBetween(_ bodyA: SCNPhysicsBody, _ bodyB: SCNPhysicsBody, options: [SCNPhysicsWorld.TestOption : Any]? = nil) -> [SCNPhysicsContact]

它与示例中的代码类似:

if  (spriteComponent.node.frame.intersects(enemySpriteComponent.node.frame))

但它位于 SceneKit 中，将为您提供有关联系人的更多信息。