public List<Node> ViewportRaycast(Rect2 area)
{
    Vector2 viewportSize = GetViewport().GetSize();

    Vector2 tl = new Vector2(area.Position.x, area.Position.y);
    Vector2 tr = new Vector2(area.Position.x + area.Size.x, area.Position.y);
    Vector2 bl = new Vector2(area.Position.x, area.Position.y + area.Size.y);
    Vector2 br = new Vector2(area.Position.x + area.Size.x, area.Position.y + area.Size.y);

    PhysicsDirectSpaceState state = GetWorld().GetDirectSpaceState();
    PhysicsShapeQueryParameters param = new PhysicsShapeQueryParameters();
    ConvexPolygonShape shape = new ConvexPolygonShape();
    shape.SetPoints(new Vector3[] {
        camera.ProjectRayOrigin(tl), // THIS IS NOT REQUIRED FOR PERSPECTIVE CAMERA. You may want to use camera.Translation
        camera.ProjectRayOrigin(tr),
        camera.ProjectRayOrigin(bl),
        camera.ProjectRayOrigin(br),
        camera.ProjectRayOrigin(tl) + camera.ProjectRayNormal(tl) * 1000,
        camera.ProjectRayOrigin(tr) + camera.ProjectRayNormal(tr) * 1000,
        camera.ProjectRayOrigin(bl) + camera.ProjectRayNormal(bl) * 1000,
        camera.ProjectRayOrigin(br) + camera.ProjectRayNormal(br) * 1000
    });
    param.SetShape(shape);
    param.CollisionMask = 2; // Very Important to prevent lag
    Godot.Array result = state.IntersectShape(param, 1000);

    List<Node> nodes = new List<Node>();

    foreach(Godot.Dictionary cast in result)
    {
        nodes.Add((Node)cast["collider"]);

    }

    return nodes;

}