Question

using UnityEngine;
using System.Collections;

public class MakeTwoPoints3D : MonoBehaviour {

    public GameObject cylinderPrefab;

    // Use this for initialization
    void Start () {

        CreateCylinderBetweenPoints(Vector3.zero, new Vector3(10, 10, 10), 0.5f);

    }

    void CreateCylinderBetweenPoints(Vector3 start, Vector3 end, float width)
    {
        var offset = end - start;
        var scale = new Vector3(width, offset.magnitude / 2.0f, width);
        var position = start + (offset / 2.0f);


        Object cylinder = Instantiate(cylinderPrefab, position, Quaternion.identity);
        cylinder.transform.up = offset;
        cylinder.transform.localScale = scale;
    }

    // Update is called once per frame
    void Update () {

    }
}

在两行同样的错误：

cylinder.transform.up = offset;
cylinder.transform.localScale = scale;

严重级代码描述项目文件行抑制状态错误CS1061＆＃39;对象＆＃39;不包含＆＃39; transform＆＃39;的定义没有扩展方法＆＃39;转换＆＃39;接受类型＆＃39;对象＆＃39;的第一个参数。可以找到（你是否缺少using指令或程序集引用？）MakeTwoPoints3D.cs 23 Active

Answer 1

Object是GameObject和GameObject的父类，是Transform类型的成员。如果您尝试从transform类的实例访问Object，则会显示以下错误：

Object'不包含'transform'的定义

如此精确的实例化和将结果对象用作GameObject的方式正如Quantic在comment中所说：

GameObject cylinder = Instantiate(cylinderPrefab, position, Quaternion.identity) as GameObject;

OR

GameObject cylinder = (GameObject) Instantiate(cylinderPrefab, position, Quaternion.identity);

在GameObject之外的其他类型的情况下，在使用组件之前始终使用null-check来确保安全性。例如：

Rigidbody rb = Instantiate(somePrefab) as Rigidbody;
if(rb != null)
  // use it here

希望这会有所帮助。

如何修复错误转换不存在？

1 个答案: