Unity学习（1）——角色移动

角色移动

1.Input.GetAxisRaw

定义

public static float GetAxisRaw(string axisName);

描述

Returns the value of the virtual axis identified by axisName with no
smoothing filtering applied.

The value will be in the range -1…1 for keyboard and joystick input.
Since input is not smoothed, keyboard input will always be either -1,
0 or 1. This is useful if you want to do all smoothing of keyboard
input processing yourself.

例子

 using UnityEngine; using System.Collections;

 public class ExampleClass : MonoBehaviour {
     void Update() {
         float speed = Input.GetAxisRaw("Horizontal") * Time.deltaTime;
         transform.Rotate(0, speed, 0);
     }

说明
1）axisName表示轴的名称，可选内容为’Horizontal(水平)’以及’Vertical(垂直)’，可在unity->edit->project settings 中查看。
2）根据键盘按键返回-1，0，1，实现角色移动。

2.Input.GetAxis

定义

public static float GetAxis(string axisName)

描述

Returns the value of the virtual axis identified by axisName.

The value will be in the range -1…1 for keyboard and joystick input.
If the axis is setup to be delta mouse movement, the mouse delta is
multiplied by the axis sensitivity and the range is not -1…1.

This is frame-rate independent; you do not need to be concerned about
varying frame-rates when using this value

例子

public class ExampleClass : MonoBehaviour {
    public float speed = 10.0F;
    public float rotationSpeed = 100.0F;
    void Update() {
        float translation = Input.GetAxis("Vertical") * speed;
        float rotation = Input.GetAxis("Horizontal") * rotationSpeed;
        translation *= Time.deltaTime;
        rotation *= Time.deltaTime;
        transform.Translate(0, 0, translation);
        transform.Rotate(0, rotation, 0);
    }
}

说明
通过按键返回-1,0,1，与GetAxisRaw不同的是，返回值逐渐增加，可用于赛车的加速的减速。

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以下是实现角色移动还有转身的代码，来自官方教程。

 void FixedUpdate()
    {
        float h = Input.GetAxisRaw("Horizontal");//获取水平方向移动
        float v = Input.GetAxisRaw("Vertical");//获取垂直方向移动
        Move(h, v);//角色移动
        Turning();//角色转向
        Animating(h, v);//动画
    }
   void Move(float h,float v)
    {
        movement.Set(h, 0f, v); //vector3向量
        movement = movement.normalized * speed * Time.deltaTime; //movement.normalized使向量单位化，结果等于每帧角色移动的距离
        playerRigidbody.MovePosition(transform.position + movement);//设置刚体移动位置
    }
    void Turning()
    {
        Ray camRay = Camera.main.ScreenPointToRay(Input.mousePosition);//定义射线检测鼠标位置
        RaycastHit floorHit; //光线投射碰撞
        if (Physics.Raycast(camRay,out floorHit, camRayLength, floorMask))
            //光线投射，计算在指定层上是否存在碰撞，返回bool
        {
            Vector3 playerToMouse = floorHit.point - transform.position;//计算差值
            playerToMouse.y = transform.position.y;//不改变y轴方向
            Quaternion newRotation = Quaternion.LookRotation(playerToMouse);
            //四元数用于表示旋转，创建一个旋转，沿着forward（z轴）并且头部沿着upwards（y轴）的约束注视
            playerRigidbody.MoveRotation(newRotation);
        }
    }
    void Animating(float h,float v)
    {
        bool walking = h != 0f || v != 0f;
        anim.SetBool("IsWalking", walking);//设置动画状态
    }