@needle-tools/engine/src/engine-components/DeleteBox.ts

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.

import { Mesh } from "three";

import { Gizmos } from "../engine/engine_gizmos.js";
import { syncDestroy } from "../engine/engine_networking_instantiate.js";
import { getParam } from "../engine/engine_utils.js";
import { BoxHelperComponent } from "./BoxHelperComponent.js";
import { Behaviour, GameObject } from "./Component.js";
import { UsageMarker } from "./Interactable.js";

const debug = getParam("debugdeletable");
/**
 * A box-shaped area that can be used to delete objects that get into it. Useful for sandbox-style builders or physics simulations.
 * @category Interactivity
 * @group Components
 */
export class DeleteBox extends BoxHelperComponent {
    static _instances: DeleteBox[] = [];
    
    onEnable(): void {
        DeleteBox._instances.push(this);
    }

    onDisable(): void {
        const idx = DeleteBox._instances.indexOf(this);
        if (idx >= 0) DeleteBox._instances.splice(idx, 1);
    }
}

/** Objects with this component can be destroyed by the {@link DeleteBox} component.
 * @category Interactivity
 * @group Components
 */
export class Deletable extends Behaviour {

    update(): void {
        for (const box of DeleteBox._instances) {
            const obj = this.gameObject as unknown as Mesh;
            const res = box.isInBox(obj);
            if (res === true) {
                const marker = GameObject.getComponentInParent(this.gameObject, UsageMarker);
                if (!marker) {
                    if (debug) {
                        try {
                            if (box["box"]) {
                                const deleteBoxArea = box["box"];
                                const deletedObjectArea = BoxHelperComponent["testBox"];
                                Gizmos.DrawWireBox3(deleteBoxArea, 0xff0000, 5);
                                Gizmos.DrawWireBox3(deletedObjectArea, 0x0000ff, 5);
                                console.log("DeleteBox: Destroying", this.gameObject, { deleteBoxArea, deletedObjectArea });
                            }
                            else {
                                console.log("DeleteBox: Destroying", this.gameObject);
                            }
                        } catch (_e) {}
                    }
                    syncDestroy(this.gameObject, this.context.connection);
                }
                else if (debug) console.warn("DeleteBox: Not deleting object with usage marker", this.guid, marker)
            }
        }
    }
}