Unity->GDscript projectile motion - attempt 1

const GRAVITY : float = 9.81
const SHAPE_RAYCAST_RADIUS := 0.3
const LINE_POINT_COUNT : int = 50           # numPoints
const TIME_BETWEEN_POINTS : float = .45     # timeBetweenPoints
const PROJECTILE_POWER = 8

var query = PhysicsShapeQueryParameters3D.new()

func _ready() -> void:
    update_visualiser_position.connect(get_parent()._on_projectile_visualiser_set_position)

    query.shape_rid = PhysicsServer3D.sphere_shape_create()
    query.exclude = [self]
    PhysicsServer3D.shape_set_data(query.shape_rid, SHAPE_RAYCAST_RADIUS)


func calculate_projectile():
    var points : Array[Vector3] = []

    var starting_pos : Vector3 = Vector3(0, 1, -1)
    var starting_velocity : Vector3 = (basis.z * PROJECTILE_POWER)

    var time := 0.0
    for n in LINE_POINT_COUNT:
        # This is how the Unity tutorials calculated both the x and z - but it doesn't seem to work very well:
        var new_point  : Vector3 = starting_pos + time * starting_velocity

        new_point.y = starting_pos.y + starting_velocity.y * time + (GRAVITY / 2.0 + pow(time, 2))

        # As new_point is local to Player, we move the query's location by the players position + new_point
        query.transform = global_transform.translated_local(new_point)

        var intersection := get_world_3d().direct_space_state.intersect_shape(query, 2)
        if not intersection.is_empty():
            # Get the point where the shape first intersected
            var collision := get_world_3d().direct_space_state.get_rest_info(query)
            if !collision.is_empty():
                # Location of point found, place an indicator on the point.
                pass
            break

        points.append(new_point)
        time += TIME_BETWEEN_POINTS