【Unity】 ベルトコンベアを作ってみる

BeltConveyor.cs

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

public class BeltConveyor : MonoBehaviour
{
    [SerializeField]
    private float       m_uvSpeed       = 1.0f;
    [SerializeField]
    private float       m_movePower     = 100.0f;
    [SerializeField]
    private float       m_speedUpPower  = 100.0f;
    [SerializeField]
    private float       m_speedUpTime   = 3.0f;

    private Renderer    m_render    = null;

    private List<Rigidbody> m_hitObjects    = new List<Rigidbody>();

    void Awake()
    {
        m_render    = GetComponent< Renderer >();
    }

    void Start()
    {
        StartCoroutine( SpeedUp( m_speedUpTime ) ); 
    }

    void Update()
    {
        ScrollUV();
    }

    void OnCollisionEnter( Collision other )
    {
        var body = other.gameObject.GetComponent<Rigidbody>();
        if( body != null )
        {
            Vector3 addPower = transform.forward * m_movePower;
            body.AddForce( addPower, ForceMode.Acceleration );

            m_hitObjects.Add( body );
        }
    }

    void OnCollisionExit( Collision other )
    {
        var body    = other.gameObject.GetComponent<Rigidbody>();
        if( body != null )
        {
            Vector3 addPower = transform.forward * m_movePower;
            body.AddForce( -addPower, ForceMode.Acceleration );

            m_hitObjects.Remove( body );
        }
    }

    /// <summary>
    /// テクスチャのUV値をスクロールさせて、ベルトコンベアの見た目を表現する
    /// </summary>
    void ScrollUV()
    {
        var material                = m_render.material;
        Vector2 offset              = material.mainTextureOffset;
        offset                     += Vector2.up * m_uvSpeed * Time.deltaTime;
        material.mainTextureOffset  = offset;
    }

    IEnumerator SpeedUp( float i_time )
    {
        while( true )
        {
            // 一定時間ごとにスピードアップ
            yield return new WaitForSeconds( i_time );
            m_movePower += m_speedUpPower;

            // 現在乗っているオブジェクトに対してスピードアップ分力を加える
            Vector3 addPower = transform.forward * m_speedUpPower;
            foreach( var body in m_hitObjects )
            {
                if( body != null )
                {
                    body.AddForce( addPower, ForceMode.Acceleration );
                }
            }
        }
    }

} // class BeltConveyor

BeltObjectGenerator.cs

using UnityEngine;
using System.Collections;

public class BeltObjectGenerator : MonoBehaviour
{
    [SerializeField]
    private GameObject  m_object    = null;
    [SerializeField]
    private float       m_time      = 2.0f;

    void Start()
    {
        StartCoroutine( Generator( m_time ) );
    }

    private IEnumerator Generator( float i_time )
    {
        var waitTime    = new WaitForSeconds( i_time );
        while( true )
        {
            yield return waitTime;
            Vector3 offset  = Vector3.zero;
            offset.x        = Random.Range( -4.0f, 4.0f );
            var obj         = GameObject.Instantiate( m_object, transform.position + offset, Quaternion.identity ) as GameObject;
            obj.SetActive( true );
        }

    }

} // class BeltObjectGenerator

BeltPlayer.cs

using UnityEngine;

public class BeltPlayer : MonoBehaviour
{
    // 移動に与える力
    [SerializeField]
    private float   m_movePower = 500.0f;

    // 前回与えた移動の力
    private Vector3 m_prevVelocity  = Vector3.zero;

    void Update()
    {
        var body        = GetComponent<Rigidbody>();

        // 前回与えた力の逆方向の力を与えて相殺
        body.AddForce( -m_prevVelocity );

        var velocity    = Vector3.zero;

        if( Input.GetKey( KeyCode.UpArrow ) )
        {
            velocity   += Vector3.forward;
        }
        if( Input.GetKey( KeyCode.DownArrow ) )
        {
            velocity   += Vector3.back;
        }
        if( Input.GetKey( KeyCode.LeftArrow ) )
        {
            velocity   += Vector3.left;
        }
        if( Input.GetKey( KeyCode.RightArrow ) )
        {
            velocity   += Vector3.right;
        }

        velocity   *= m_movePower;
        body.AddForce( velocity );

        // 与えた力を保存
        m_prevVelocity  = velocity;
    }


} // class BeltPlayer