AddForce给物体添加刚体效果并且脚本增加一个力（按空格实现）

using UnityEngine;

using System.Collections;

public class CubeAddForce : MonoBehaviour {

    float hor,ver;

    //力的方向向量

    Vector3 forceDir;

    //力的大小

    public float force = ;

    Rigidbody rig;

    void Start()

    {

        rig = GetComponent<Rigidbody> ();

    }

    void Update()

    {

        hor = Input.GetAxis ("Horizontal");

        ver = Input.GetAxis ("Vertical");

        forceDir = new Vector3 (hor,,ver);

        //施加一个力

        rig.AddForce (forceDir * force);

        if (Input.GetKeyDown (KeyCode.Space)) {

            rig.AddExplosionForce (, Vector3.zero, );

        }

    }

}