6-1 Camera Movement 摄像机的控制

夜行的猫仔 · 发表于 2013-10-2 08:19:37

如何通过脚本控制摄像机的移动
未标题-1.jpg

在这个类中，摄像机预设了5个点。当玩家移动的时候，从后先前查询这5个点哪个点可以看到玩家，则将摄像机移到这个新位置。

CameraMovement
C#

using UnityEngine;
using System.Collections;
public class CameraMovement : MonoBehaviour
{
public float smooth = 1.5f; // 摄像机追随速度.
private Transform player; // 玩家变换矩阵变量.
private Vector3 relCameraPos; // 摄像机与玩家之间的相对位置向量.
private float relCameraPosMag; // 摄像机到玩家之间的距离.
private Vector3 newPos; // 摄像机将要到达的新位置.
void Awake ()
{
// 初始化变量.
player = GameObject.FindGameObjectWithTag(Tags.player).transform;
// 设置相对位置作为初始位置.
relCameraPos = transform.position - player.position;
relCameraPosMag = relCameraPos.magnitude - 0.5f;
}
void FixedUpdate ()
{
// 设定一个标准位置从摄像机到玩家.
Vector3 standardPos = player.position + relCameraPos;
// 摄像机在玩家头顶的高度.
Vector3 abovePos = player.position + Vector3.up * relCameraPosMag;
// 创建一个数组，设定5个位置可以看到玩家.
Vector3[] checkPoints = new Vector3[5];
// 第一个是摄像机的标准位置.
checkPoints[0] = standardPos;
// 剩下三个分别是从悬浮位置到标准位置之间的几个位置.
checkPoints[1] = Vector3.Lerp(standardPos, abovePos, 0.25f);
checkPoints[2] = Vector3.Lerp(standardPos, abovePos, 0.5f);
checkPoints[3] = Vector3.Lerp(standardPos, abovePos, 0.75f);
// 最后一个是悬浮位置.
checkPoints[4] = abovePos;
// 遍历这些点...
for(int i = 0; i < checkPoints.Length; i++)
{
// ... 如果在当前位置可以看到玩家...
if(ViewingPosCheck(checkPoints[i]))
// ... 返回.
break;
}
// 从摄像机的当前位置过渡到新位置.
transform.position = Vector3.Lerp(transform.position, newPos, smooth * Time.deltaTime);
// 平滑过渡
SmoothLookAt();
}
bool ViewingPosCheck (Vector3 checkPos)
{
RaycastHit hit;
// 如果设想在看到玩家的图中碰到物体...
if(Physics.Raycast(checkPos, player.position - checkPos, out hit, relCameraPosMag))
// ... 这个物体不是玩家...
if(hit.transform != player)
// 这个位置就不对.
return false;
// 如果中间没有任何阻挡.
newPos = checkPos;
return true;
}
void SmoothLookAt ()
{
// 建立摄像机到玩家的射线.
Vector3 relPlayerPosition = player.position - transform.position;
// Create a rotation based on the relative position of the player being the forward vector.
// 获取旋转角
Quaternion lookAtRotation = Quaternion.LookRotation(relPlayerPosition, Vector3.up);
// Lerp the camera's rotation between it's current rotation and the rotation that looks at the player.
// 做插值
transform.rotation = Quaternion.Lerp(transform.rotation, lookAtRotation, smooth * Time.deltaTime);
}
}

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JS

#pragma strict
public var smooth : float = 1.5f; // The relative speed at which the camera will catch up.
private var player : Transform; // Reference to the player's transform.
private var relCameraPos : Vector3; // The relative position of the camera from the player.
private var relCameraPosMag : float; // The distance of the camera from the player.
private var newPos : Vector3; // The position the camera is trying to reach.
function Awake ()
{
// Setting up the reference.
player = GameObject.FindGameObjectWithTag(Tags.player).transform;
// Setting the relative position as the initial relative position of the camera in the scene.
relCameraPos = transform.position - player.position;
relCameraPosMag = relCameraPos.magnitude - 0.5f;
}
function FixedUpdate ()
{
// The standard position of the camera is the relative position of the camera from the player.
var standardPos : Vector3 = player.position + relCameraPos;
// The abovePos is directly above the player at the same distance as the standard position.
var abovePos : Vector3 = player.position + Vector3.up * relCameraPosMag;
// An array of 5 points to check if the camera can see the player.
var checkPoints : Vector3[] = new Vector3[5];
// The first is the standard position of the camera.
checkPoints[0] = standardPos;
// The next three are 25%, 50% and 75% of the distance between the standard position and abovePos.
checkPoints[1] = Vector3.Lerp(standardPos, abovePos, 0.25f);
checkPoints[2] = Vector3.Lerp(standardPos, abovePos, 0.5f);
checkPoints[3] = Vector3.Lerp(standardPos, abovePos, 0.75f);
// The last is the abovePos.
checkPoints[4] = abovePos;
// Run through the check points...
for(var i = 0; i < checkPoints.Length; i++)
{
// ... if the camera can see the player...
if(ViewingPosCheck(checkPoints[i]))
// ... break from the loop.
break;
}
// Lerp the camera's position between it's current position and it's new position.
transform.position = Vector3.Lerp(transform.position, newPos, smooth * Time.deltaTime);
// Make sure the camera is looking at the player.
SmoothLookAt();
}
function ViewingPosCheck (checkPos : Vector3) : boolean
{
var hit : RaycastHit;
// If a raycast from the check position to the player hits something...
if(Physics.Raycast(checkPos, player.position - checkPos, hit, relCameraPosMag))
// ... if it is not the player...
if(hit.transform != player)
// This position isn't appropriate.
return false;
// If we haven't hit anything or we've hit the player, this is an appropriate position.
newPos = checkPos;
return true;
}
function SmoothLookAt ()
{
// Create a vector from the camera towards the player.
var relPlayerPosition : Vector3 = player.position - transform.position;
// Create a rotation based on the relative position of the player being the forward vector.
var lookAtRotation : Quaternion = Quaternion.LookRotation(relPlayerPosition, Vector3.up);
// Lerp the camera's rotation between it's current rotation and the rotation that looks at the player.
transform.rotation = Quaternion.Lerp(transform.rotation, lookAtRotation, smooth * Time.deltaTime);
}

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6-1 Camera Movement 摄像机的控制

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