不允许我创建超过1个LineRenderer

Question

我试图在运行时创建LineRenderers(当用户按下按钮时).

我的问题:我永远不能创建多个LineRenderer.当我去创建第二个时,LineRenderer对象始终为NULL.

我究竟做错了什么？您能否就创建多个LineRenderer需要做些什么提供建议？

public class AppInit : MonoBehaviour {

        public Vector3[] TEST_VERTICES;
        public const int SPEED = 5;
        public List<LineRenderer> lines;

        // Use this for initialization
        void Start () {
             TEST_VERTICES = new Vector3[10] {new Vector3(0,0,0), new Vector3(10,10,10), new Vector3(30,10,50), new Vector3(30,40,50), 
                                                                            new Vector3(10,30,90), new Vector3(10,20,40), new Vector3(50,20,40), new Vector3(70,80,90), 
                                                                            new Vector3(10,70,20), new Vector3(60,10,0)};
             lines = new List<LineRenderer>();
        }

        // Update is called once per frame
        void Update () {
             float x = Input.GetAxis ("Horizontal") * Time.deltaTime * SPEED;
             float z = 0;
             float y = Input.GetAxis ("Vertical")   * Time.deltaTime * SPEED;

             gameObject.transform.Translate (new Vector3(x,y,z));
        }

        void OnGUI() {
             if (GUI.Button (new Rect(10,10,100,20), "Create"))
                 createString(TEST_VERTICES);
        }

        public bool createString( Vector3[] vertices ) {
             LineRenderer lRend = gameObject.AddComponent ("LineRenderer") as LineRenderer;
             //LineRenderer lRend = new LineRenderer();
             lines.Add(lRend);
             Debug.Log ("IS NULL"+(lRend == null).ToString ());
             lRend.SetColors (new Color(100,0,0,100), new Color(0,0,100,100));
             lRend.SetWidth(10, 1);
             lRend.SetVertexCount(vertices.Length);

             for (int i=0; i<vertices.Length; i++)
                 lRend.SetPosition(i, vertices[i]);

             return true;
        }
}

Answer 1

正如Iridium指出的那样,您只能将每种类型的一个组件添加到游戏对象中.所以你想为每个新的linerenderer创建一个新的游戏对象.这里做到这一点的简单方法是改变:

LineRenderer lRend = gameObject.AddComponent("LineRenderer") as LineRenderer;

至:

LineRenderer lRend = new GameObject().AddComponent("LineRenderer") as LineRenderer;

然后,如果您需要稍后访问linerenderer的gameobject,您可以通过lRend.gameObject执行此操作.或者行[index] .gameObject.