unity无窗口效果｜Claymore's blog

本笔记参照蛮牛案例而作
http://www.manew.com/thread-43230-1-1.html
下面是最后成品：觉得好酷炫，哈哈，谢谢大神的教程

首先新建项目，在项目中新建一个shader，shader代码如下：（可直接复制）

Shader "Custom/ChromakeyTransparent" {
Properties {
_MainTex ("Base (RGB)", 2D) = "white" {}
_TransparentColourKey ("Transparent Colour Key", Color) = (0,0,0,1)
_TransparencyTolerance ("Transparency Tolerance", Float) = 0.01
}
SubShader {
Pass { 
Tags { "RenderType" = "Opaque" } 
LOD 200 
CGPROGRAM 
#pragma vertex vert 
#pragma fragment frag
#include "UnityCG.cginc"
 
struct a2v  
{  
float4 pos : POSITION; 
float2 uv : TEXCOORD0; 
}; 
struct v2f 
{ 
float4 pos : SV_POSITION;
float2 uv : TEXCOORD0; 
};
 
v2f vert(a2v input) 
{
v2f output;  
output.pos = mul (UNITY_MATRIX_MVP, input.pos);
output.uv = input.uv;
return output;
}
  
sampler2D _MainTex;
float3 _TransparentColourKey;
float _TransparencyTolerance;
float4 frag(v2f input) : SV_Target
 
{
// What is the colour that *would* be rendered here?
float4 colour = tex2D(_MainTex, input.uv);
// Calculate the different in each component from the chosen transparency colour
float deltaR = abs(colour.r - _TransparentColourKey.r);
float deltaG = abs(colour.g - _TransparentColourKey.g);
float deltaB = abs(colour.b - _TransparentColourKey.b);
// If colour is within tolerance, write a transparent pixel
 
if (deltaR < _TransparencyTolerance && deltaG < _TransparencyTolerance && deltaB < _TransparencyTolerance)
{
return float4(0.0f, 0.0f, 0.0f, 0.0f);
} 
// Otherwise, return the regular colour 
return colour;  
} 
ENDCG
}
}
}

输入一张纹理，一个关键颜色值以及相应的阈值，用于将指定的范围变透明（也就是大家所熟知的“抠图”）。
这个等我过后再学习shader回来再看。

接下来新建一个材质并使用上面的Shader，选定你想要替换的关键颜色值（必要时也可改变阈值）。注意这里不用手动指定纹理，我们会将摄像机的输出应用到该纹理，也就是下一步要做的事情。

新建一个脚本赋给主摄像机，代码如下：

using System;
using System.Runtime.InteropServices;
using UnityEngine;
   
public class NoFragment : MonoBehaviour
{
    [SerializeField]
    private Material m_Material;
    private struct MARGINS
    {
        public int cxLeftWidth;
        public int cxRightWidth;
        public int cyTopHeight;
        public int cyBottomHeight;
    }
   
    // Define function signatures to import from Windows APIs
    [DllImport("user32.dll")]
    private static extern IntPtr GetActiveWindow();
    [DllImport("user32.dll")]
    private static extern int SetWindowLong(IntPtr hWnd, int nIndex, uint dwNewLong);
    [DllImport("Dwmapi.dll")]
    private static extern uint DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS margins);
    // Definitions of window styles
    const int GWL_STYLE = -16;
    const uint WS_POPUP = 0x80000000;
    const uint WS_VISIBLE = 0x10000000;
    void Start()
    {
#if !UNITY_EDITOR  
var margins = new MARGINS() { cxLeftWidth = -1 };
 
// Get a handle to the window
var hwnd = GetActiveWindow();
 
// Set properties of the window
// See: [url]https://msdn.microsoft.com/en-us/library/windows/desktop/ms633591%28v=vs.85%29.aspx[/url]
 
SetWindowLong(hwnd, GWL_STYLE, WS_POPUP | WS_VISIBLE);
 
// Extend the window into the client area
//See: [url]https://msdn.microsoft.com/en-us/library/windows/desktop/aa969512%28v=vs.85%29.aspx[/url]
 
DwmExtendFrameIntoClientArea(hwnd, ref margins);
 
#endif
    }
    // Pass the output of the camera to the custom material
    // for chroma replacement
    void OnRenderImage(RenderTexture from, RenderTexture to)
    {
        Graphics.Blit(from, to, m_Material);
    }
}

这个代码复制博主的有一个地方没有注释掉，会显示错误，我更改过来了。

上面的代码用到了InterOpServices命名空间，以便调用一些Windows底层API从而改变Unity应用在运行时的窗口属性。然后使用OnRenderImage事件将摄像机的输出应用到RenderTexture。将使用了上面自定义Shader的材质赋给脚本种的m_Material字段，这样我们就可以开始抠图了。

下面重点来了，就是将天空盒去掉，这里原博文没有说，将摄像机的背景颜色改为与透明材质（就是之前新建的那个材质）中_TransparentColourKey属性一样。

最后就是build and run 啦。。

unity无窗口效果

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