TestOutArg.cs

    using UnityEngine;
    using System.Collections;
    using LuaInterface;
    using System;

    public class TestOutArg : MonoBehaviour 
    {            
        string script =
            @"                    
                print('start')
                local box = UnityEngine.BoxCollider

                function TestPick(ray)                                                                  
                    local _layer = 2 ^ LayerMask.NameToLayer('Default')
                    local flag, hit = UnityEngine.Physics.Raycast(ray, nil, 5000, _layer)                          
                    --local flag, hit = UnityEngine.Physics.Raycast(ray, RaycastHit.out, 5000, _layer)                

                    if flag then
                        print('pick from lua, point: '..tostring(hit.point))                                        
                    end
                end
            ";

        LuaState state = null;
        LuaFunction func = null;

        void Start () 
        {
            new LuaResLoader();
            state = new LuaState();
            LuaBinder.Bind(state);
            state.Start();
            state.DoString(script, "TestOutArg.cs");

            func = state.GetFunction("TestPick");
        }

        void Update()
        {
            if (Input.GetMouseButtonDown(0))
            {
                Camera camera = Camera.main;
                Ray ray = camera.ScreenPointToRay(Input.mousePosition);
                RaycastHit hit;
                bool flag = Physics.Raycast(ray, out hit, 5000, 1 << LayerMask.NameToLayer("Default"));

                if (flag)
                {
                    Debugger.Log("pick from c#, point: [{0}, {1}, {2}]", hit.point.x, hit.point.y, hit.point.z);
                }

                func.BeginPCall();
                func.Push(ray);
                func.PCall();
                func.EndPCall();
            }

            state.CheckTop();
            state.Collect();
        }

        void OnDestroy()
        {
            func.Dispose();
            func = null;

            state.Dispose();
            state = null;
        }
    }

🔚