Lerp and Slerp

Lerp (Linear Interpolation) -> 선형보간

언제어디서든 균일한 속도로 작동

Slerp(Spherical Linear Interpolation) -> 구면 선형 보간

구를 보간

구면 선형 보간은 주로 회전로직에 사용된다.

시작지점과 종료지점은 느리게 동작한다. 

 

Test Code

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class LerpSlerpMain : MonoBehaviour
{
    [SerializeField] private Transform startTrans;
    [SerializeField] private Transform endTrans;
    [SerializeField] private Transform playerTrans1;
    [SerializeField] private Transform playerTrans2;
    [Range(0.0f,1.0f)] [SerializeField] private float time1;
    [Range(0.0f,1.0f)] [SerializeField] private float time2;

    private float elapsedTime = 0.0f;
    // Update is called once per frame
    void Update()
    {

        //보간된 위치
        Vector3 pos1 = Vector3.Lerp(this.startTrans.position, this.endTrans.position, this.time1);
        //Vector3 pos2 = Vector3.Slerp(this.startTrans.position, this.endTrans.position, time2); //(시작 좌표, 종료 좌표, 시간)
        
        if(this.time1 == 0.0f)
        {
            this.playerTrans1.LookAt(this.endTrans.position);
        }
        else if (this.time1 == 1.0f)
        {
            this.playerTrans1.LookAt(this.startTrans.position);
        }
        this.playerTrans1.position = pos1;
        //this.playerTrans2.position = pos2;
        //Debug.LogFormat("player's position {0}, Time:{1}",this.playerTrans.position,this.time);
    }

    private void OnDrawGizmos()
    {
        Gizmos.color = Color.yellow;
        Gizmos.DrawLine(this.startTrans.position,this.endTrans.position);
    }
}

선형보간, 구면 선형보간 비교

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class LerpSlerpMain : MonoBehaviour
{
    [SerializeField] private Transform startTrans1;
    [SerializeField] private Transform endTrans1;

    [SerializeField] private Transform startTrans2;
    [SerializeField] private Transform endTrans2;

    [SerializeField] private Transform playerTrans1;
    [SerializeField] private Transform playerTrans2;
    [Range(0.0f,1.0f)] [SerializeField] private float time1;
    [Range(0.0f,1.0f)] [SerializeField] private float time2;

    private float elapsedTime = 0.0f;
    // Update is called once per frame
    void Update()
    {
        this.playerTrans1.position = Vector3.Lerp(this.playerTrans1.position, this.endTrans1.position,Time.deltaTime);
        this.playerTrans2.position = Vector3.Slerp(this.playerTrans2.position, this.endTrans2.position,Time.deltaTime);
    }

    private void OnDrawGizmos()
    {
        Gizmos.color = Color.yellow;
        Gizmos.DrawLine(this.startTrans1.position,this.endTrans1.position);
        Gizmos.color = Color.red;
        Gizmos.DrawLine(this.startTrans2.position,this.endTrans2.position);
    }
}

두 보간 차이 비교