Shoot bullet from handgun canon

🌵 Needle Engine
1

I want to know how I can fix my script to be able to instantiate my project from the tip of my cannon object, below is my complete script:

@serializable()
enableMobileInput: boolean = true;

@serializable()
enableDesktopInput: boolean = true;

//@nonSerialized
@serializable()
vrSide: XRHandedness | "any" = "any";

@serializable()
fireRate: number = 0.1;

@serializable(Object3D)
raycastReference?: Object3D;

@serializable(Animator)
gunAnimator?: Animator;

@serializable()
fireAnimation: string = "Fire";

@serializable(AudioSource)
fireSound?: AudioSource;

@serializable(ParticleSystem)
muzzleFlash?: ParticleSystem;

@serializable(ParticleSystem)
ejectShell?: ParticleSystem;

@serializable(ParticleSystem)
impactEffect?: ParticleSystem;

/////

@serializable(AssetReference)
arrowPrefab?: AssetReference;

@serializable(AudioSource)
sound?: AudioSource;

/////

@serializable(Vector3)
startPosition?: Vector3;

@serializable(Object3D)
positionReference?: Object3D; // Reference to the object which position you want to use

private onMouseClick = (event: MouseEvent) => {
if (!document.pointerLockElement && event.target !== this.context.renderer.domElement) return;
if (isMobileDevice()) return; // ignore desktop input on mobile

    if (event.button !== 0) // if not the LMB or primary, abort
        return;
    this.fire();

    const myPosition : Vector3 = new Vector3(0, 0, 0);
    //const myPosition : Vector3 = new Vector3(this.startPosition);

    //this.myObjectReference = this.gameObject.position.clone(); 

    // Instantiate the object at the position of 'positionReference'

    // Adjust the position if necessary, for now it inherits the position from 'positionReference'
    // instance.position.set(...) if you need to adjust the position further

    //const myPosition : Vector3 = myObjectReference;
    
     this.shoot(myPosition, myPosition);
}

/**
* shoot an arrow
* @param from position to shoot from
* @param vec direction to shoot (not normalized)
*/
private async shoot(from: Vector3, vec: Vector3) {
if (!this.arrowPrefab) return;
const instance = await this.arrowPrefab.instantiate({ parent: this.context.scene });
const force = Math.pow(vec.length() + .5, 2);
const dir = vec.clone().normalize();
if (instance) {
instance.position.copy(from);
instance.lookAt(dir.clone().add(from));
instance.visible = true;
const rb = instance.getOrAddComponent(Rigidbody);
rb.isKinematic = false;
rb.autoMass = false;
rb.mass = .05;
this.sound?.stop();
this.sound?.play();
// workaround Rigidbody not yet created in the physics engine (it gets created in onEnable)
//wait delayForFrames(1);
rb.applyImpulse(dir.multiplyScalar(force), true);
}
}

2

helps?

3

Hi,

Please take a look at the scripting reference

and checkout the PhysicsPlayground sample (the Cannon.ts script in particular)

See the reply in the discord Discord

please don’t ask the same question multiple times in multiple locations (discord and forum)