Fabrica Ventorum

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# Spawn a physics prop at the player's aim (GMod-style)
func spawn_prop_at_camera():
    var cam = $Camera
    var origin = cam.global_transform.origin
    var forward = -cam.global_transform.basis.z
    var spawn_pos = origin + forward * 5

    var prop = RigidBody3D.new()
    var mesh = MeshInstance3D.new()
    mesh.mesh = CubeMesh.new()
    prop.add_child(mesh)
    prop.global_transform.origin = spawn_pos
    get_tree().current_scene.add_child(prop)

    # give it a little upward impulse so it pops into the world
    prop.apply_impulse(Vector3.ZERO, Vector3(0, 200, 0))

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# Hitscan 'weapon' that pushes physics props on hit
func fire_hitscan():
    var cam = $Camera
    var from = cam.global_transform.origin
    var to = from + (-cam.global_transform.basis.z) * 1000
    var space = get_world_3d().direct_space_state
    var res = space.intersect_ray(from, to, [self],  true, true)
    if res:
        var body = res.collider
        if body and body is RigidBody3D:
            # apply impulse away from the hit point
            var dir = (body.global_transform.origin - res.position).normalized()
            body.apply_impulse(res.position - body.global_transform.origin, dir * 800)
        else:
            print("Hit: ", res.collider)

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# Timed explosion that nudges nearby physics props
func _ready():
    var t = Timer.new()
    t.wait_time = 3.0
    t.one_shot = true
    add_child(t)
    t.connect("timeout", Callable(self, "_on_explode"))
    t.start()

func _on_explode():
    var bodies = get_tree().get_nodes_in_group("destructible")
    for b in bodies:
        if b and b is RigidBody3D:
            var dir = (b.global_transform.origin - global_transform.origin).normalized()
            b.apply_impulse(Vector3.ZERO, dir * (200 + randi() % 400))
    print("Boom!")