unity CharacterMotor 中按下shift 实现加速

按下shift加速，减速，实际上只是速度的变换。刚开始，我直接在CharacterMotor中修改代码，结果出现一些很奇怪的问题。后来在http://answers.unity3d.com/questions/164638/how-to-make-the-fps-character-controller-run-and-c.html

找到了解决方法。从新写一个脚本，

using UnityEngine;
 using System.Collections;
 
 public class RunAndCrouch : MonoBehaviour 
 {
     public float walkSpeed = 7; // regular speed
     public float crchSpeed = 3; // crouching speed
     public float runSpeed = 20; // run speed
     
     private CharacterMotor chMotor;
     private Transform tr;
     private float dist; // distance to ground
     
     // Use this for initialization
     void Start () 
     {
         chMotor =  GetComponent<CharacterMotor>();
         tr = transform;
         CharacterController ch = GetComponent<CharacterController>();
         dist = ch.height/2; // calculate distance to ground
     }
     
     // Update is called once per frame
     void FixedUpdate ()
     {
         float vScale = 1.0f;
         float speed = walkSpeed;
         
         if ((Input.GetKey("left shift") || Input.GetKey("right shift")) && chMotor.grounded)
         {
             speed = runSpeed;            
         }
         
         if (Input.GetKey("c"))
         { // press C to crouch
             vScale = 0.5f;
             speed = crchSpeed; // slow down when crouching
         }
         
         chMotor.movement.maxForwardSpeed = speed; // set max speed
         float ultScale = tr.localScale.y; // crouch/stand up smoothly 
         
         Vector3 tmpScale = tr.localScale;
         Vector3 tmpPosition = tr.position;
         
         tmpScale.y = Mathf.Lerp(tr.localScale.y, vScale, 5 * Time.deltaTime);
         tr.localScale = tmpScale;
         
         tmpPosition.y += dist * (tr.localScale.y - ultScale); // fix vertical position        
         tr.position = tmpPosition;
     }
 }

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