判断周围是否有敌人的三种模式

转载自：http://blog.sina.com.cn/s/blog_6b3661a90101ac1z.html

1、只攻击正前方的单位，向前发射一条射线，攻击碰到的单位

RaycastHit hit;

//range 射线的长度，即攻击范围，maskTarget敌方单位的mask，只攻击敌方单位

if(Physics.Raycast(unit.thisT.position, unit.thisT.forward, out hit, range, maskTarget)){

Unit targetTemp=hit.collider.gameObject.GetComponent();

if(targetTemp!=null && targetTemp.HPAttribute.HP>0){

target=targetTemp;

if(attackMode==_AttackMode.StopNAttack){

if(attackMethod!=_AttackMethod.Melee) unit.StopAnimation();

unit.StopMoving();

}

}

}

2、以己方单位为圆心的某一半径长度内

//返回相交球的所有碰撞体

Collider[] cols=Physics.OverlapSphere(unit.thisT.position, range, maskTarget);

//if(cols!=null && cols.Length>0) Debug.Log(cols[0]);

if(cols.Length>0){

Collider currentCollider=cols[Random.Range(0, cols.Length)];

Unit targetTemp=currentCollider.gameObject.GetComponent();

if(targetTemp!=null && targetTemp.HPAttribute.HP>0){

target=targetTemp;

if(attackMode==_AttackMode.StopNAttack){

if(attackMethod!=_AttackMethod.Melee) unit.StopAnimation();

unit.StopMoving();

}

}

}

3、以己方单位为圆心的扇形范围内

Collider[] cols=Physics.OverlapSphere(unit.thisT.position, range, maskTarget);

//if(cols!=null && cols.Length>0) Debug.Log(cols[0]);

if(cols.Length>0){

Collider currentCollider=cols[0];

foreach(Collider col in cols){

Quaternion targetRot=Quaternion.LookRotation(col.transform.position-unit.thisT.position);

if(Quaternion.Angle(targetRot, unit.thisT.rotation)

Unit targetTemp=currentCollider.gameObject.GetComponent();

if(targetTemp!=null && targetTemp.HPAttribute.HP>0){

target=targetTemp;

if(attackMode==_AttackMode.StopNAttack){

if(attackMethod!=_AttackMethod.Melee) unit.StopAnimation();

unit.StopMoving();

}

break;

}

}

}

}