unity3d stealth 카메라 움직임.

| 유니티/Note 2015. 1. 4. 01:14

Posted by 히아레인

using UnityEngine;
using System.Collections;

public class CameraMovement : MonoBehaviour 
{
	public float smooth = 1.5f;         // The relative speed at which the camera will catch up.
	
	
	private Transform player;           // Reference to the player's transform.
	private Vector3 relCameraPos;       // The relative position of the camera from the player.
	private float relCameraPosMag;      // The distance of the camera from the player.
	private Vector3 newPos;             // The position the camera is trying to reach.
	
	
	void 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;
	}
	
	
	void FixedUpdate ()
	{
		// The standard position of the camera is the relative position of the camera from the player.
		Vector3 standardPos = player.position + relCameraPos;
		
		// The abovePos is directly above the player at the same distance as the standard position.
		Vector3 abovePos = player.position + Vector3.up * relCameraPosMag;
		
		// An array of 5 points to check if the camera can see the player.
		Vector3[] checkPoints = 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(int 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();
	}
	
	
	bool ViewingPosCheck (Vector3 checkPos)
	{
		RaycastHit hit;
		
		// If a raycast from the check position to the player hits something...
		if(Physics.Raycast(checkPos, player.position - checkPos, out 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;
	}
	
	
	void SmoothLookAt ()
	{
		// Create a vector from the camera towards the player.
		Vector3 relPlayerPosition = player.position - transform.position;
		
		// Create a rotation based on the relative position of the player being the forward vector.
		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.
		transform.rotation = Quaternion.Lerp(transform.rotation, lookAtRotation, smooth * Time.deltaTime);
	}
}

캐릭터가 벽에 가려지는걸 방지하기 위해서 총 5개의 경로로 카메라가 이동하는 로직..

standardPos 는 처음 카메라의 위치이고.player.position + relCameraPos; -> relCameraPos = transform.position - player.position; -> transofrm.position;

abovePos는 플레이어의 위치에서 바로 위(직각으로)

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