protected override bool TestVisibility(VisualAspect aspect)
        {
            //if not in cylinder, can not see it
            float aspRad = aspect.Radius;

            if (aspRad > MathUtil.EPSILON)
            {
                if (!Cone.ContainsSphere(this.transform.position,
                                         this.transform.position + this.Direction * _range,
                                         _startRadius,
                                         _endRadius,
                                         aspect.transform.position,
                                         aspRad))
                {
                    return(false);
                }
            }
            else
            {
                if (!Cone.ContainsPoint(this.transform.position,
                                        this.transform.position + this.Direction * _range,
                                        _startRadius,
                                        _endRadius,
                                        aspect.transform.position))
                {
                    return(false);
                }
            }

            if (this.RequiresLineOfSight)
            {
                var v = aspect.transform.position - this.transform.position;
                using (var lst = com.spacepuppy.Collections.TempCollection.GetList <RaycastHit>())
                {
                    int cnt = PhysicsUtil.RaycastAll(this.transform.position, v, lst, v.magnitude, this.LineOfSightMask);
                    for (int i = 0; i < cnt; i++)
                    {
                        //we ignore ourself
                        var r = lst[i].collider.FindRoot();
                        if (r != aspect.entityRoot && r != this.entityRoot)
                        {
                            return(false);
                        }
                    }
                }
            }

            return(true);
        }