[伊利丹·怒风] Unity3D 绘制矩形（DrawRect）及可视化调试

背景

由于要做Native2D的A* 算法寻路，所以必须进行Scene的网格划分，而进行了网格划分需要进行可视化的调试，需求就是这个逻辑。具体是实现如下效果，这里绿色的区域就是角色不能进入的区域（或者是走不进去的地方，大家玩网游都遇到过吧）

按照这个思路基本是两个问题，1、如何实现可视化调试；2、Unity如何绘制网格

实现

1、Unity如何实现可视化调试

本文的实现完全围绕需求来走，就是需要在2D环境中实现可配置网格显示。先按照背景中的思路学习轮子，百度下基本下篇大牛的总结比较好，比较全

【风宇冲】图形化调试 http://blog.sina.com.cn/s/blog_471132920101gxzf.html

这里可耻的转载一下

Unity中图形化调试主要4种
Debug.Draw
Gizmos.Draw
Graphic.DrawMesh
GL
只需在Scene窗口显示的调试图像
     一直显示的 OnDrawGizmos + Gizmos.Draw
     选中显示的 OnDrawGizmosSelected + Gizmos.Draw
     脚本控制的 Update + Debug.Draw
需要在实际设备屏幕显示的调试图像
    Update+Graphic.DrawMesh
    OnRenderObject+GL
 
Graphic.DrawMesh和Debug.Draw   调用一致，都是在Update系里
Graphic.DrawMesh和GL       显示类似，都在各个窗口显示，并且可以设置材质。

 

这里根据我自己的要求，只要能在Editor模式下的Scene和Game中显示就可以了。

2、Unity如何绘制网格

在1中 大牛已经给出了方向和简单的列子，下面就是自己实现了，刚开始比较懒，还是想一步到位,直接找到一个类似DrawRect的函数直接在中绘制矩形，结果果然失败，找了很久也没有这样的函数和或者别人分享的。下面分享下自己搜集的方案

A、使用Mesh网格进行绘制

说实话我觉得这种方法对于我的需求是没什么实际作用的，而且看起来有些虚，最主要的问题是网格不可控制。

[C#] 纯文本查看 复制代码

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publicclass Grid : MonoBehaviour

{

    [ SerializeField ] privateTransform _transform;

    [ SerializeField ] privateMaterial _material;

    [ SerializeField ] privateVector2 _gridSize;

    [ SerializeField ] privateint _rows;

    [ SerializeField ] privateint _columns;

    voidStart()

    {

        UpdateGrid();

    }

    publicvoid UpdateGrid()

    {

        _transform.localScale = newVector3( _gridSize.x, _gridSize.y, 1.0f );

        _material.SetTextureScale( \"_MainTex\", newVector2( _columns, _rows ) );

    }

}

B、第二个方法就是使用GL

这种方法其实还是比较底层的，竟然还用到了传说中的Shader，用于拔高也是不错的列子，而且看起来也不虚，但最主要的问题是网格不可控制。再说我也觉得用GL有点杀鸡用牛刀的感觉。

[C#] 纯文本查看 复制代码

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usingUnityEngine;

usingSystem.Collections;

//http://answers.unity3d.com/questions/482128/draw-grid-lines-in-game-view.html?page=2&pageSize=5&sort=votes

 

 

publicclass ShowGrid : MonoBehaviour {

 

    publicbool showMain = true;

    publicbool showSub = false;

 

    publicfloat gridSizeX;

    publicfloat gridSizeY;

 

    publicfloat smallStep;

    publicfloat largeStep;

 

    publicfloat startX;

    publicfloat startY;

 

    publicfloat offsetY;

    publicfloat offsetX;

 

    privateMaterial lineMaterial;

 

    privateColor mainColor = newColor(0f, 1f, 0f, 1f);

    privateColor subColor = newColor(0f, 0.5f, 0f, 1f);

 

    voidStart()

    {

 

        gridSizeX *= smallStep;

        gridSizeY *= smallStep;

    }

 

    voidUpdate()

    {

    }

 

    voidCreateLineMaterial()

    {

 

        if(!lineMaterial)

        {

            lineMaterial = newMaterial(\"Shader \\"Lines/Colored Blended\\" {\" +

                \"SubShader { Pass { \" +

                \"    Blend SrcAlpha OneMinusSrcAlpha \" +

                \"    ZWrite Off Cull Off Fog { Mode Off } \" +

                \"    BindChannels {\" +

                \"      Bind \\"vertex\\", vertex Bind \\"color\\", color }\" +

                \"} } }\");

            lineMaterial.hideFlags = HideFlags.HideAndDontSave;

            lineMaterial.shader.hideFlags = HideFlags.HideAndDontSave;

        }

    }

 

    voidOnRenderObject()

    {

        CreateLineMaterial();

        // set the current material

        lineMaterial.SetPass(0);

        GL.Begin(GL.LINES);

 

        if(showSub)

        {

            GL.Color(subColor);

 

            //Layers

            for(floatj = 0; j <= gridSizeY; j += smallStep)

            {

                //X axis lines

                GL.Vertex3(startX + offsetX, j + offsetY, 0);

                GL.Vertex3(gridSizeX + offsetX, j + offsetY, 0);

            }

 

            //Y axis lines

            for(floatk = 0; k <= gridSizeX; k += smallStep)

            {

                GL.Vertex3(startX + k + offsetX, startY + offsetY, 0);

                GL.Vertex3(startX + k + offsetX, gridSizeY + offsetY, 0);

            }

 

        }

 

        if(showMain)

        {

            GL.Color(mainColor);

 

            //Layers

            for(floatj = 0; j <= gridSizeY; j += largeStep)

            {

                //X axis lines

                GL.Vertex3(startX + offsetX, j + offsetY, 0);

                GL.Vertex3(gridSizeX + offsetX, j + offsetY, 0);

            }

 

            //Y axis lines

            for(floatk = 0; k <= gridSizeX; k += largeStep)

            {

                GL.Vertex3(startX + k + offsetX, startY + offsetY, 0);

                GL.Vertex3(startX + k + offsetX, gridSizeY + offsetY, 0);

            }

        }

        GL.End();

    }

}

C、第三个方法Gizmos.Draw

这也是我最终使用的方法，实现效果如下所示，其实Gizmos的功能很强大，可以绘制Mesh和Cude，在3D调试中用处不能小视。

这里主要遇到的问题是Gizmos没有提供DrawRect函数需要自己实现，这里其实本身没有什么技术难度，因为已经提供了DrawLine函数。自己比较懒，本来想看是否有现成的直接剽窃下，后来Seach未果，只能自己实现了，下面是实现函数，同时提供DrawPath和DrawLine函数这里是从itween里提取出来的

[C#] 纯文本查看 复制代码

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/// <summary>

   /// When called from an OnDrawGizmos() function it will draw a curved path through the provided array of Vector3s.

   /// </summary>

   /// <param name="\"path\"">

   /// A <see cref="\"Vector3s[]\"/">

   ///

   /// <param name="\"color\"">

   /// A <see cref="\"Color\"/">

   /// 

   publicstatic void DrawPath(Vector3[] path, Color color)

   {

       if(path.Length > 0)

       {

           DrawPathHelper(path, color, \"gizmos\");

       }

   }

 

   /// <summary>

   /// When called from an OnDrawGizmos() function it will draw a line through the provided array of Vector3s.

   /// </summary>

   /// <param name="\"line\"">

   /// A <see cref="\"Vector3s[]\"/">

   ///

   /// <param name="\"color\"">

   /// A <see cref="\"Color\"/">

   /// 

   publicstatic void DrawLine(Vector3[] line, Color color)

   {

       if(line!=null&& line.Length > 0)

       {

           DrawLineHelper(line, color, \"gizmos\");

       }

   }

 

   publicstatic void DrawRect( Rect rect, Color color)

   {

       Vector3[] line =newVector3[5];

       line[0] = newVector3(rect.x,rect.y,0);

       line[1] = newVector3(rect.x+rect.width, rect.y, 0);

       line[2] = newVector3(rect.x + rect.width, rect.y + rect.height, 0);

       line[3] = newVector3(rect.x, rect.y + rect.height, 0);

       line[4] = newVector3(rect.x, rect.y, 0);

       if(line != null&& line.Length > 0)

       {

           DrawLineHelper(line, color, \"gizmos\");

       }

   }  

 

   privatestatic void DrawLineHelper(Vector3[] line, Color color, stringmethod)

   {

       Gizmos.color = color;

       for(inti = 0; i < line.Length - 1; i++)

       {

           if(method == \"gizmos\")

           {

               Gizmos.DrawLine(line[i], line[i + 1]); ;

           }

           elseif (method == \"handles\")

           {

               Debug.LogError(\"iTween Error: Drawing a line with Handles istemporarily disabled because of compatability issues with Unity 2.6!\");

               //UnityEditor.Handles.DrawLine(line[i], line[i+1]);

           }

       }

   }

 

   privatestatic void DrawPathHelper(Vector3[] path, Color color, stringmethod)

   {

       Vector3[] vector3s = PathControlPointGenerator(path);

 

       //Line Draw:

       Vector3 prevPt = Interp(vector3s, 0);

       Gizmos.color = color;

       intSmoothAmount = path.Length * 20;

       for(inti = 1; i <= SmoothAmount; i++)

       {

           floatpm = (float)i / SmoothAmount;

           Vector3 currPt = Interp(vector3s, pm);

           if(method == \"gizmos\")

           {

               Gizmos.DrawLine(currPt, prevPt);

           }

           elseif (method == \"handles\")

           {

               Debug.LogError(\"iTween Error: Drawing a path with Handles istemporarily disabled because of compatability issues with Unity 2.6!\");

               //UnityEditor.Handles.DrawLine(currPt, prevPt);

           }

           prevPt = currPt;

       }

   }

   /// <summary>

   /// 三点计算抛物线.

   /// </summary>

   /// <returns>组成抛物线的点.</returns>

   /// <param name="\"path\"">确定抛物线的三个点或者更多的点的数组.

   publicstatic List<vector3> DrawPathHelper(Vector3[] path)

   {

       List<vector3> array = newList<vector3>(177);

       Vector3[] vector3s = PathControlPointGenerator(path);

       //Line Draw:

       Vector3 prevPt = Interp(vector3s, 0);

       intSmoothAmount = path.Length * 20;

       for(inti = 1; i <= SmoothAmount; i++)

       {

           floatpm = (float)i / SmoothAmount;

           Vector3 currPt = Interp(vector3s, pm);

           array.Add(currPt);

           prevPt = currPt;

       }

       returnarray;

   }

   privatestatic Vector3[] PathControlPointGenerator(Vector3[] path)

   {

       Vector3[] suppliedPath;

       Vector3[] vector3s;

       //create and store path points:

       suppliedPath = path;

       //populate calculate path;

       intoffset = 2;

       vector3s = newVector3[suppliedPath.Length + offset];

       System.Array.Copy(suppliedPath, 0, vector3s, 1, suppliedPath.Length);

       //populate start and end control points:

       //vector3s[0] = vector3s[1] - vector3s[2];

       vector3s[0] = vector3s[1] + (vector3s[1] - vector3s[2]);

       vector3s[vector3s.Length - 1] = vector3s[vector3s.Length - 2] + (vector3s[vector3s.Length - 2] - vector3s[vector3s.Length - 3]);

       //is this a closed, continuous loop? yes? well then so let's make a continuous Catmull-Rom spline!

       if(vector3s[1] == vector3s[vector3s.Length - 2])

       {

           Vector3[] tmpLoopSpline = newVector3[vector3s.Length];

           System.Array.Copy(vector3s, tmpLoopSpline, vector3s.Length);

           tmpLoopSpline[0] = tmpLoopSpline[tmpLoopSpline.Length - 3];

           tmpLoopSpline[tmpLoopSpline.Length - 1] = tmpLoopSpline[2];

           vector3s = newVector3[tmpLoopSpline.Length];

           System.Array.Copy(tmpLoopSpline, vector3s, tmpLoopSpline.Length);

       }

       return(vector3s);

   }

   //andeeee from the Unity forum's steller Catmull-Rom class ( http://forum.unity3d.com/viewtopic.php?p=218400#218400 ):

   privatestatic Vector3 Interp(Vector3[] pts, floatt)

   {

       intnumSections = pts.Length - 3;

       intcurrPt = Mathf.Min(Mathf.FloorToInt(t * (float)numSections), numSections - 1);

       floatu = t * (float)numSections - (float)currPt;

       Vector3 a = pts[currPt];

       Vector3 b = pts[currPt + 1];

       Vector3 c = pts[currPt + 2];

       Vector3 d = pts[currPt + 3];

       return.5f * (

           (-a + 3f * b - 3f * c + d) * (u * u * u)

           + (2f * a - 5f * b + 4f * c - d) * (u * u)

           + (-a + c) * u

           + 2f * b

           );

   }</vector3></vector3></vector3></see></see></see></see>

总结

程序员都懒总想找现成的，这次我提供个现成的给你哦。如果真对你有用别忘记给我投一票。

2016年度游戏蛮牛最受欢迎专栏作家评选，为他们投票！ 别忘记我是恶魔猎手哦（wind2006）

3.jpg (153.87 KB, 下载次数: 0)

背景

由于要做Native2D的A* 算法寻路，所以必须进行Scene的网格划分，而进行了网格划分需要进行可视化的调试，需求就是这个逻辑。具体是实现如下效果，这里绿色的区域就是角色不能进入的区域（或者是走不进去的地方，大家玩网游都遇到过吧）

按照这个思路基本是两个问题，1、如何实现可视化调试；2、Unity如何绘制网格

实现

1、Unity如何实现可视化调试

本文的实现完全围绕需求来走，就是需要在2D环境中实现可配置网格显示。先按照背景中的思路学习轮子，百度下基本下篇大牛的总结比较好，比较全

【风宇冲】图形化调试 http://blog.sina.com.cn/s/blog_471132920101gxzf.html

这里可耻的转载一下

Unity中图形化调试主要4种
Debug.Draw
Gizmos.Draw
Graphic.DrawMesh
GL
只需在Scene窗口显示的调试图像
     一直显示的 OnDrawGizmos + Gizmos.Draw
     选中显示的 OnDrawGizmosSelected + Gizmos.Draw
     脚本控制的 Update + Debug.Draw
需要在实际设备屏幕显示的调试图像
    Update+Graphic.DrawMesh
    OnRenderObject+GL
 
Graphic.DrawMesh和Debug.Draw   调用一致，都是在Update系里
Graphic.DrawMesh和GL       显示类似，都在各个窗口显示，并且可以设置材质。

 

这里根据我自己的要求，只要能在Editor模式下的Scene和Game中显示就可以了。

2、Unity如何绘制网格

在1中 大牛已经给出了方向和简单的列子，下面就是自己实现了，刚开始比较懒，还是想一步到位,直接找到一个类似DrawRect的函数直接在中绘制矩形，结果果然失败，找了很久也没有这样的函数和或者别人分享的。下面分享下自己搜集的方案

A、使用Mesh网格进行绘制

说实话我觉得这种方法对于我的需求是没什么实际作用的，而且看起来有些虚，最主要的问题是网格不可控制。

[C#] 纯文本查看 复制代码

?

 

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publicclass Grid : MonoBehaviour

{

    [ SerializeField ] privateTransform _transform;

    [ SerializeField ] privateMaterial _material;

    [ SerializeField ] privateVector2 _gridSize;

    [ SerializeField ] privateint _rows;

    [ SerializeField ] privateint _columns;

    voidStart()

    {

        UpdateGrid();

    }

    publicvoid UpdateGrid()

    {

        _transform.localScale = newVector3( _gridSize.x, _gridSize.y, 1.0f );

        _material.SetTextureScale( \"_MainTex\", newVector2( _columns, _rows ) );

    }

}

B、第二个方法就是使用GL

这种方法其实还是比较底层的，竟然还用到了传说中的Shader，用于拔高也是不错的列子，而且看起来也不虚，但最主要的问题是网格不可控制。再说我也觉得用GL有点杀鸡用牛刀的感觉。

[C#] 纯文本查看 复制代码

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usingUnityEngine;

usingSystem.Collections;

//http://answers.unity3d.com/questions/482128/draw-grid-lines-in-game-view.html?page=2&pageSize=5&sort=votes

 

 

publicclass ShowGrid : MonoBehaviour {

 

    publicbool showMain = true;

    publicbool showSub = false;

 

    publicfloat gridSizeX;

    publicfloat gridSizeY;

 

    publicfloat smallStep;

    publicfloat largeStep;

 

    publicfloat startX;

    publicfloat startY;

 

    publicfloat offsetY;

    publicfloat offsetX;

 

    privateMaterial lineMaterial;

 

    privateColor mainColor = newColor(0f, 1f, 0f, 1f);

    privateColor subColor = newColor(0f, 0.5f, 0f, 1f);

 

    voidStart()

    {

 

        gridSizeX *= smallStep;

        gridSizeY *= smallStep;

    }

 

    voidUpdate()

    {

    }

 

    voidCreateLineMaterial()

    {

 

        if(!lineMaterial)

        {

            lineMaterial = newMaterial(\"Shader \\"Lines/Colored Blended\\" {\" +

                \"SubShader { Pass { \" +

                \"    Blend SrcAlpha OneMinusSrcAlpha \" +

                \"    ZWrite Off Cull Off Fog { Mode Off } \" +

                \"    BindChannels {\" +

                \"      Bind \\"vertex\\", vertex Bind \\"color\\", color }\" +

                \"} } }\");

            lineMaterial.hideFlags = HideFlags.HideAndDontSave;

            lineMaterial.shader.hideFlags = HideFlags.HideAndDontSave;

        }

    }

 

    voidOnRenderObject()

    {

        CreateLineMaterial();

        // set the current material

        lineMaterial.SetPass(0);

        GL.Begin(GL.LINES);

 

        if(showSub)

        {

            GL.Color(subColor);

 

            //Layers

            for(floatj = 0; j <= gridSizeY; j += smallStep)

            {

                //X axis lines

                GL.Vertex3(startX + offsetX, j + offsetY, 0);

                GL.Vertex3(gridSizeX + offsetX, j + offsetY, 0);

            }

 

            //Y axis lines

            for(floatk = 0; k <= gridSizeX; k += smallStep)

            {

                GL.Vertex3(startX + k + offsetX, startY + offsetY, 0);

                GL.Vertex3(startX + k + offsetX, gridSizeY + offsetY, 0);

            }

 

        }

 

        if(showMain)

        {

            GL.Color(mainColor);

 

            //Layers

            for(floatj = 0; j <= gridSizeY; j += largeStep)

            {

                //X axis lines

                GL.Vertex3(startX + offsetX, j + offsetY, 0);

                GL.Vertex3(gridSizeX + offsetX, j + offsetY, 0);

            }

 

            //Y axis lines

            for(floatk = 0; k <= gridSizeX; k += largeStep)

            {

                GL.Vertex3(startX + k + offsetX, startY + offsetY, 0);

                GL.Vertex3(startX + k + offsetX, gridSizeY + offsetY, 0);

            }

        }

        GL.End();

    }

}

C、第三个方法Gizmos.Draw

这也是我最终使用的方法，实现效果如下所示，其实Gizmos的功能很强大，可以绘制Mesh和Cude，在3D调试中用处不能小视。

这里主要遇到的问题是Gizmos没有提供DrawRect函数需要自己实现，这里其实本身没有什么技术难度，因为已经提供了DrawLine函数。自己比较懒，本来想看是否有现成的直接剽窃下，后来Seach未果，只能自己实现了，下面是实现函数，同时提供DrawPath和DrawLine函数这里是从itween里提取出来的

[C#] 纯文本查看 复制代码

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/// <summary>

   /// When called from an OnDrawGizmos() function it will draw a curved path through the provided array of Vector3s.

   /// </summary>

   /// <param name="\"path\"">

   /// A <see cref="\"Vector3s[]\"/">

   ///

   /// <param name="\"color\"">

   /// A <see cref="\"Color\"/">

   /// 

   publicstatic void DrawPath(Vector3[] path, Color color)

   {

       if(path.Length > 0)

       {

           DrawPathHelper(path, color, \"gizmos\");

       }

   }

 

   /// <summary>

   /// When called from an OnDrawGizmos() function it will draw a line through the provided array of Vector3s.

   /// </summary>

   /// <param name="\"line\"">

   /// A <see cref="\"Vector3s[]\"/">

   ///

   /// <param name="\"color\"">

   /// A <see cref="\"Color\"/">

   /// 

   publicstatic void DrawLine(Vector3[] line, Color color)

   {

       if(line!=null&& line.Length > 0)

       {

           DrawLineHelper(line, color, \"gizmos\");

       }

   }

 

   publicstatic void DrawRect( Rect rect, Color color)

   {

       Vector3[] line =newVector3[5];

       line[0] = newVector3(rect.x,rect.y,0);

       line[1] = newVector3(rect.x+rect.width, rect.y, 0);

       line[2] = newVector3(rect.x + rect.width, rect.y + rect.height, 0);

       line[3] = newVector3(rect.x, rect.y + rect.height, 0);

       line[4] = newVector3(rect.x, rect.y, 0);

       if(line != null&& line.Length > 0)

       {

           DrawLineHelper(line, color, \"gizmos\");

       }

   }  

 

   privatestatic void DrawLineHelper(Vector3[] line, Color color, stringmethod)

   {

       Gizmos.color = color;

       for(inti = 0; i < line.Length - 1; i++)

       {

           if(method == \"gizmos\")

           {

               Gizmos.DrawLine(line[i], line[i + 1]); ;

           }

           elseif (method == \"handles\")

           {

               Debug.LogError(\"iTween Error: Drawing a line with Handles istemporarily disabled because of compatability issues with Unity 2.6!\");

               //UnityEditor.Handles.DrawLine(line[i], line[i+1]);

           }

       }

   }

 

   privatestatic void DrawPathHelper(Vector3[] path, Color color, stringmethod)

   {

       Vector3[] vector3s = PathControlPointGenerator(path);

 

       //Line Draw:

       Vector3 prevPt = Interp(vector3s, 0);

       Gizmos.color = color;

       intSmoothAmount = path.Length * 20;

       for(inti = 1; i <= SmoothAmount; i++)

       {

           floatpm = (float)i / SmoothAmount;

           Vector3 currPt = Interp(vector3s, pm);

           if(method == \"gizmos\")

           {

               Gizmos.DrawLine(currPt, prevPt);

           }

           elseif (method == \"handles\")

           {

               Debug.LogError(\"iTween Error: Drawing a path with Handles istemporarily disabled because of compatability issues with Unity 2.6!\");

               //UnityEditor.Handles.DrawLine(currPt, prevPt);

           }

           prevPt = currPt;

       }

   }

   /// <summary>

   /// 三点计算抛物线.

   /// </summary>

   /// <returns>组成抛物线的点.</returns>

   /// <param name="\"path\"">确定抛物线的三个点或者更多的点的数组.

   publicstatic List<vector3> DrawPathHelper(Vector3[] path)

   {

       List<vector3> array = newList<vector3>(177);

       Vector3[] vector3s = PathControlPointGenerator(path);

       //Line Draw:

       Vector3 prevPt = Interp(vector3s, 0);

       intSmoothAmount = path.Length * 20;

       for(inti = 1; i <= SmoothAmount; i++)

       {

           floatpm = (float)i / SmoothAmount;

           Vector3 currPt = Interp(vector3s, pm);

           array.Add(currPt);

           prevPt = currPt;

       }

       returnarray;

   }

   privatestatic Vector3[] PathControlPointGenerator(Vector3[] path)

   {

       Vector3[] suppliedPath;

       Vector3[] vector3s;

       //create and store path points:

       suppliedPath = path;

       //populate calculate path;

       intoffset = 2;

       vector3s = newVector3[suppliedPath.Length + offset];

       System.Array.Copy(suppliedPath, 0, vector3s, 1, suppliedPath.Length);

       //populate start and end control points:

       //vector3s[0] = vector3s[1] - vector3s[2];

       vector3s[0] = vector3s[1] + (vector3s[1] - vector3s[2]);

       vector3s[vector3s.Length - 1] = vector3s[vector3s.Length - 2] + (vector3s[vector3s.Length - 2] - vector3s[vector3s.Length - 3]);

       //is this a closed, continuous loop? yes? well then so let's make a continuous Catmull-Rom spline!

       if(vector3s[1] == vector3s[vector3s.Length - 2])

       {

           Vector3[] tmpLoopSpline = newVector3[vector3s.Length];

           System.Array.Copy(vector3s, tmpLoopSpline, vector3s.Length);

           tmpLoopSpline[0] = tmpLoopSpline[tmpLoopSpline.Length - 3];

           tmpLoopSpline[tmpLoopSpline.Length - 1] = tmpLoopSpline[2];

           vector3s = newVector3[tmpLoopSpline.Length];

           System.Array.Copy(tmpLoopSpline, vector3s, tmpLoopSpline.Length);

       }

       return(vector3s);

   }

   //andeeee from the Unity forum's steller Catmull-Rom class ( http://forum.unity3d.com/viewtopic.php?p=218400#218400 ):

   privatestatic Vector3 Interp(Vector3[] pts, floatt)

   {

       intnumSections = pts.Length - 3;

       intcurrPt = Mathf.Min(Mathf.FloorToInt(t * (float)numSections), numSections - 1);

       floatu = t * (float)numSections - (float)currPt;

       Vector3 a = pts[currPt];

       Vector3 b = pts[currPt + 1];

       Vector3 c = pts[currPt + 2];

       Vector3 d = pts[currPt + 3];

       return.5f * (

           (-a + 3f * b - 3f * c + d) * (u * u * u)

           + (2f * a - 5f * b + 4f * c - d) * (u * u)

           + (-a + c) * u

           + 2f * b

           );

   }</vector3></vector3></vector3></see></see></see></see>

总结

程序员都懒总想找现成的，这次我提供个现成的给你哦。如果真对你有用别忘记给我投一票。

2016年度游戏蛮牛最受欢迎专栏作家评选，为他们投票！ 别忘记我是恶魔猎手哦（wind2006）

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