lowpolydungeon/Assets/Components/EnemyAI.re.ts

import * as RE from 'rogue-engine';
import { Object3D, Vector3 } from 'three';
import WorldFPSController from './WorldFPSController.re';

export default class EnemyAI extends RE.Component {
  @RE.props.object3d() target: Object3D;
  @RE.props.num() movementSpeed: number = 0.3;
  @RE.props.num() attackDistance: number = 0.3;

  targetPosition: Vector3 = new Vector3();

  awake() {

    if(!this.target) {
      let gameLogic = RE.App.currentScene.getObjectByName("GameLogic")
      this.target = RE.App.currentScene.getObjectByName("Player") || new Object3D()
      this.targetPosition = RE.getComponent(WorldFPSController, gameLogic)?.characterOffset.position || this.target.position
    } else {
      this.targetPosition = this.target.position
    }

  }

  start() {

  }

  update() {
    const deltaTime = RE.Runtime.deltaTime;

    this.object3d.lookAt(this.target.position)

    let movementVector = new Vector3(0, 0, 1)
    if(this.object3d.position.distanceTo(this.targetPosition) <= this.attackDistance) {
      movementVector.set(0,0,0)
    }

    
    movementVector
          .transformDirection(this.object3d.matrix)
          .multiplyScalar(this.movementSpeed * deltaTime);
      this.object3d.position.x += movementVector.x;
      this.object3d.position.z += movementVector.z;

  }
}

RE.registerComponent(EnemyAI);