dcl-npc-toolkit-ai-version/dist/faceUserSystem.js

A collection of tools for creating Non-Player-Characters (NPCs). These are capable of having conversations with the player, and play different animations. AI usage is added atop of it

import { Schemas, Transform, engine } from "@dcl/sdk/ecs";
import { Quaternion, Vector3 } from "@dcl/sdk/math";
let faceUserAdded = false;
export function addFaceUserSystem() {
    faceUserAdded = true;
    engine.addSystem(faceUserSystem);
}
export const TrackUserFlag = engine.defineComponent("npcutils::trackUserFlag", {
    lockXZRotation: Schemas.Boolean,
    active: Schemas.Boolean,
    rotSpeed: Schemas.Number
});
export function faceUserSystem(dt) {
    for (const [entity, track] of engine.getEntitiesWith(TrackUserFlag)) {
        if (track.active) {
            const player = Transform.get(engine.PlayerEntity);
            let lookAtTarget = Vector3.create(player.position.x, player.position.y, player.position.z);
            let direction = Vector3.subtract(lookAtTarget, Transform.get(entity).position);
            let transform = Transform.getMutable(entity);
            transform.rotation = Quaternion.slerp(player.rotation, Quaternion.lookRotation(direction), dt * track.rotSpeed);
            if (track.lockXZRotation) {
                transform.rotation.x = 0;
                transform.rotation.z = 0;
            }
        }
    }
}
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