@needle-tools/engine/lib/engine-components/physics/Attractor.js

Needle Engine is a web-based runtime for 3D apps. It runs on your machine for development with great integrations into editors like Unity or Blender - and can be deployed onto any device! It is flexible, extensible and networking and XR are built-in.

var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
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};
import { serializable } from "../../engine/engine_serialization_decorator.js";
import { Behaviour } from "../Component.js";
import { Rigidbody } from "../RigidBody.js";
/**
 * Used to attract Rigidbodies towards the position of this component.
 * Add Rigidbodies to the `targets` array to have them be attracted.
 * You can use negative strength values to create a repulsion effect.
 *
 * @example Attractor component attracting a Rigidbody
 * ```ts
 * const attractor = object.addComponent(Attractor);
 * attractor.strength = 5; // positive value to attract
 * attractor.radius = 10; // only attract within 10 units
 * attractor.targets.push(rigidbody); // add the Rigidbody to be attracted
 * @summary Attract Rigidbodies towards the position of this component
 * @category Physics
 * @group Components
 */
export class Attractor extends Behaviour {
    strength = 1;
    radius = 2;
    targets = [];
    update() {
        const wp = this.gameObject.worldPosition;
        const factor = -this.strength * this.context.time.deltaTime;
        this.targets?.forEach(t => {
            if (!t)
                return;
            const dir = t.gameObject.worldPosition.sub(wp);
            const length = dir.length();
            if (length > this.radius)
                return;
            let _factor = factor;
            if (length > 1)
                _factor /= length * length;
            else
                _factor /= Math.max(.05, length);
            t.applyImpulse(dir.multiplyScalar(_factor));
        });
    }
}
__decorate([
    serializable()
], Attractor.prototype, "strength", void 0);
__decorate([
    serializable()
], Attractor.prototype, "radius", void 0);
__decorate([
    serializable(Rigidbody)
], Attractor.prototype, "targets", void 0);
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