Unity3D 学习笔记(八) 锁定目标与 Physics.OverlapBox
添加所需变量
添加变量
public bool lockon;
新button
public Button lockButton = new Button();
以及
lockButton.Tick(Input.GetKey(keyLock));
lockon = lockButton.OnPressed;
调取这个信号
if(pi.lockon){
camcon.LockSwitch();
}
在CameraController中
public void LockSwitch()
{
print("lock");
}
尝试lock可以正常调用
利用OverlapBox检测碰撞
检测target使用API Physics.OverlapBox
public static Collider[] **OverlapBox**([Vector3](https://docs.unity3d.com/ScriptReference/Vector3.html) **center**, [Vector3](https://docs.unity3d.com/ScriptReference/Vector3.html) **halfExtents**, [Quaternion](https://docs.unity3d.com/ScriptReference/Quaternion.html) **orientation** = Quaternion.identity, int **layerMask** = AllLayers, [QueryTriggerInteraction](https://docs.unity3d.com/ScriptReference/QueryTriggerInteraction.html) **queryTriggerInteraction** = QueryTriggerInteraction.UseGlobal);
参数 Vector3类型的BOX中心，三个维度下BOX的半长组成的Vector3，Quaternion类型的BOX的方向，碰撞的Layer，默认为所以的Layer，最后的queryTrigger暂时不需要。
返回值为与BOX碰撞的Collider
在CameraController中声明新变量
private GameObject lockTarget;
完善LockSwitch函数，使其能计算出锁定目标，将其赋值给lockTarget
public void LockSwitch()
{
print("lock");
//if(lockTarget == null){
//try to lock others
Vector3 modelOrigin1 = model.transform.position;
Vector3 modelOrigin2 = modelOrigin1 + new Vector3(0,1,0);//计算出人脑袋的位置
Vector3 boxCenter = modelOrigin2 + model.transform.forward *5.0f;//???
Collider[] cols = Physics.OverlapBox(boxCenter,new Vector3(0.5f,0.5f,5f),model.transform.rotation,LayerMask.GetMask("Enemy"));
if(cols.Length == 0){
lockTarget = null;
}
else {
foreach(var col in cols){
//print(col.name);
if(lockTarget == col.gameObject)
{
lockTarget = null;
print("lock cancel");
break;
}
else{
lockTarget = col.gameObject;
print(lockTarget);
break;
}
}
}
}
修改相机控制中的追踪部分，当无目标时与原来相同，有锁定目标时视线始终看向目标并调整角色朝向
void FixedUpdate()
{
if(lockTarget == null){
Vector3 tempModeEuler = model.transform.eulerAngles;
playerHandle.transform.Rotate(Vector3.up,pi.Jright * horizontalSpeed *Time.fixedDeltaTime);
//cameraHandle.transform.Rotate(Vector3.right,pi.Jup * -verticalSpeed *Time.deltaTime);
//tempEulerX = cameraHandle.transform.eulerAngles.x;
tempEulerX -= pi.Jup * verticalSpeed *Time.deltaTime;
tempEulerX = Mathf.Clamp(tempEulerX,-40,30);
cameraHandle.transform.localEulerAngles = new Vector3(
tempEulerX,0,0);
model.transform.eulerAngles = tempModeEuler;
}
else {
Vector3 tempForward = lockTarget.transform.position - model.transform.position;
tempForward.y = 0;
playerHandle.transform.forward = tempForward;
}
cam.transform.position = Vector3.SmoothDamp(cam.transform.position,transform.position,ref cameraDampVelocity,0.5f);
//cam.transform.eulerAngles = transform.eulerAngles;
cam.transform.LookAt(cameraHandle.transform);//一直看着camerahandle
}
可以实现视角的锁定
显示锁定目标的圆圈
创建一个UI里面的Image
选择合适的图形、大小、颜色（在game窗口看到这个image）
在cameraController中添加
using UnityEngine.UI;
public Image lockDot;
在start中使其初始不可用
lockDot.enabled = false;
在分支中添加对应的启用和禁用
此时进游戏发现点在视野中央，但是由于摄像机的跟随效果所以其与锁定目标有所便宜，因此在FixedUpdate中的有锁定目标分支添加
lockDot.transform.position = Camera.main.WorldToScreenPoint (lockTarget.transform.position);
再打开游戏，可以实现效果