如何在Unity中画抛物线

 using UnityEngine;
 using System.Collections;
 using System.Collections.Generic;
 [ExecuteInEditMode]
 public class Parabola : MonoBehaviour {
     //重力
     [Range(,)]
     public float gravity = 0.13f;
     //最大长度
     public float maxLength = ;
     //两点之间的距离
     const float length = 0.2f;
     //点集合
     List<Vector3> m_List = new List<Vector3>();
     Material m_LineMat;

     public void OnRenderObject() {
         CreateLineMaterial();
         m_LineMat.SetPass();

         Vector3 position = transform.position;
         Vector3 forward = transform.rotation * Vector3.forward * length;
         Vector3 newPos = position;
         Vector3 lastPos = newPos;
         m_List.Add(newPos);
         int i = , iMax = ;
         float dis = ;
         while (dis < maxLength) {
             i++;
             newPos = lastPos + forward + Vector3.up * i * -gravity * 0.1f;
             dis += Vector3.Distance(lastPos, newPos);
             m_List.Add(newPos);
             lastPos = newPos;
         }

         GL.Begin(GL.LINES);
         i = ;
         iMax = m_List.Count;
         for (i = ; i < iMax; i++) {
             GL.Vertex(m_List[i]);
         }
         GL.End();

         m_List.Clear();
     }

     void CreateLineMaterial() {
         if (!m_LineMat) {
             var shader = Shader.Find("Hidden/Internal-Colored");
             m_LineMat = new Material(shader);
             m_LineMat.hideFlags = HideFlags.HideAndDontSave;
             m_LineMat.SetInt("_SrcBlend", (int)UnityEngine.Rendering.BlendMode.SrcAlpha);
             m_LineMat.SetInt("_DstBlend", (int)UnityEngine.Rendering.BlendMode.OneMinusSrcAlpha);
             m_LineMat.SetInt("_Cull", (int)UnityEngine.Rendering.CullMode.Off);
             m_LineMat.SetInt("_ZWrite", );
         }
     }
 }

原文：http://blog.csdn.net/utilxk