3D遊戲鏈遊系統開發（原始碼）

using 
UnityEngine;




public 
class 
Leg : MonoBehaviour

{

    
//可編輯



    [SerializeField] 
public Transform leg; 


    [SerializeField] 
private Transform foot; 


    [SerializeField] 
private Transform legRoot;    


    [SerializeField] 
private Transform IK_Target;    


    [SerializeField] 
private 
float length;


    [SerializeField] 
private Leg otherLeg;


    [SerializeField] 
private Transform rayOrigin;


    [SerializeField] 
private LayerMask layer;



    
//內部欄位


    
private 
float legX;

    
private 
float legY;

    
private 
bool isLerp;

    
private Vector2 target;

    
private 
float shmTime;



    
//公共欄位



    [HideInInspector] 
public 
bool Active;



    
private 
void Update()

    {

        
//腿的弧度


        
float x_adj = legRoot.position.x - legX;

        
float y_opp = legRoot.position.y - legY;

        
float legRad = Mathf.Atan2(y_opp, x_adj);

        
//腳的弧度


        
float tempX = legRoot.position.x - Mathf.Cos(legRad) * length;

        
float tempY = legRoot.position.y - Mathf.Sin(legRad) * length;

        x_adj = tempX - IK_Target.position.x;

        y_opp = tempY - IK_Target.position.y;

        
float footRad = Mathf.Atan2(y_opp, x_adj);

        
//腿的位置


        legX = IK_Target.position.x + Mathf.Cos(footRad) * length;

        legY = IK_Target.position.y + Mathf.Sin(footRad) * length;

        
//最終定位


        leg.SetPositionAndRotation(
new Vector2(legX, legY), Quaternion.Euler(
new Vector3(
0, 
0, legRad * Mathf.Rad2Deg)));

        foot.SetPositionAndRotation(
new Vector2(IK_Target.position.x, IK_Target.position.y), Quaternion.Euler(
new Vector3(
0, 
0, footRad * Mathf.Rad2Deg)));



        
//射線,尋找蜘蛛的下一次落腳點


        RaycastHit2D hit = Physics2D.Raycast(rayOrigin.position, -rayOrigin.up, 
5, layer);

        
if (hit)

        {

            target = hit.point;

            Debug.DrawRay(rayOrigin.position, rayOrigin.up * (hit.point - (Vector2)rayOrigin.position) - 
new Vector2(
0, 
0.1f), Color.red, 
0.05f);

        }



        
//根據條件來控制蜘蛛的步伐


        
if (Mathf.Abs(target.x - IK_Target.position.x) > 
0.7f) { isLerp = 
true; }

        
if (isLerp && Active) 

        { 

            IK_Target.position = Vector2.MoveTowards(IK_Target.position, target + 
new Vector2(
0.1f, 
0), Time.deltaTime * 
3);

            shmTime += Time.deltaTime;

            IK_Target.position += 
new Vector3(
0, Mathf.Cos(shmTime) * 
1.5f) * Time.deltaTime; 
//簡諧運動做為蜘蛛抬腿運動的數學模型


        }

        
if (Vector2.Distance(IK_Target.position, target + 
new Vector2(
0.1f, 
0)) < 
0.1f)

        {

            isLerp = 
false;

            shmTime = 
0;

            
//協調蜘蛛的另一支腿


            Active = 
false;

            otherLeg.Active = 
true;

        }

    }

}