I am trying to implement a ChacterControllerComponent using the following URL.
https://developer.apple.com/documentation/realitykit/charactercontrollercomponent
I have written sample code, but PhysicsSimulationEvents.WillSimulate is not executed and nothing happens.
import SwiftUI
import RealityKit
import RealityKitContent
struct ImmersiveView: View {
let gravity: SIMD3<Float> = [0, -50, 0]
let jumpSpeed: Float = 10
enum PlayerInput {
case none, jump
}
@State private var testCharacter: Entity = Entity()
@State private var myPlayerInput = PlayerInput.none
var body: some View {
RealityView { content in
// Add the initial RealityKit content
if let immersiveContentEntity = try? await Entity(named: "Immersive", in: realityKitContentBundle) {
content.add(immersiveContentEntity)
testCharacter = immersiveContentEntity.findEntity(named: "Capsule")!
testCharacter.components.set(CharacterControllerComponent())
let _ = content.subscribe(to: PhysicsSimulationEvents.WillSimulate.self, on: testCharacter) {
event in
print("subscribe run")
let deltaTime: Float = Float(event.deltaTime)
var velocity: SIMD3<Float> = .zero
var isOnGround: Bool = false
// RealityKit automatically adds `CharacterControllerStateComponent` after moving the character for the first time.
if let ccState = testCharacter.components[CharacterControllerStateComponent.self] {
velocity = ccState.velocity
isOnGround = ccState.isOnGround
}
if !isOnGround {
// Gravity is a force, so you need to accumulate it for each frame.
velocity += gravity * deltaTime
} else if myPlayerInput == .jump {
// Set the character's velocity directly to launch it in the air when the player jumps.
velocity.y = jumpSpeed
}
testCharacter.moveCharacter(by: velocity * deltaTime, deltaTime: deltaTime, relativeTo: nil) {
event in
print("playerEntity collided with \(event.hitEntity.name)")
}
}
}
}
}
}
The scene is loaded from RCP. It is simple, just a capsule on a pedestal.
Do I need a separate code to run testCharacter from this state?
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