判断对象是否在视线内

// Cast a sphere with the desired distance. Check each collider hit to see if it is within the field of view. Set objectFound

    // to the object that is most directly in front of the agent

    /// <summary>

    /// Withins the sight.

    /// </summary>

    /// <returns>The sight.</returns>

    /// <param name="transform">玩家</param>

    /// <param name="fieldOfViewAngle">可视角度</param>

    /// <param name="viewDistance">可视距离</param>

    /// <param name="objectLayerMask">对象层</param>

    public static Transform WithinSight(Transform transform, float fieldOfViewAngle, float viewDistance, LayerMask objectLayerMask)

    {

        Transform objectFound = null;

        var hitColliders = Physics.OverlapSphere(transform.position, viewDistance, objectLayerMask);//获取可视范围内的对象

        if (hitColliders != null) {

            float minAngle = Mathf.Infinity;

            float angle = 0;

            for (int i = 0; i < hitColliders.Length; ++i) {

                // The hit agent needs to be within the field of view of the current agent

                if ((angle = Vector3.Angle(transform.position, hitColliders[i].transform.position)) < fieldOfViewAngle) {//获取可视角度内的对象

                    RaycastHit hit;

                    // The hit agent needs to be within view of the current agent

                    if (Physics.Linecast(transform.position, hitColliders[i].transform.position, out hit)) {//检测玩家与对象之间是否存在障碍物

                        if (hit.transform.Equals(hitColliders[i].transform)) {

                            // This agent is within sight. Set it to the agentInSight GameObject if the angle is less than any of the other agents

                            if (angle < minAngle) {//获取最小角度对象

                                minAngle = angle;

                                objectFound = hitColliders[i].transform;

                            }

                        }

                    }

                }

            }

        }

        return objectFound;

    }

判断对象是否在视线内