Unity 绿幕抠图 摄像头抠图 单色抠图

最近迷上了看直播，看到有些主播MM的背景很好看 所以就自己弄了一个非常好看的背景 首先，实验环境   背景图   最终效果   实现原理，就是将图片传入Shader，然后将材质放在一个物体上 Shader代码： [C#] 纯文本查看 复制代码 ?   01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 Shader "我的Shader/自定义/05过滤纯色" {         Properties         {                 _MainTex("主纹理", 2D) = "white" { }                 _TransparentColourKey("过滤的颜色", Color) = (0,0,0,1)                 _TransparencyToleranceR("透明公差R", Range(0.01, 1.0)) = 0.01                 _TransparencyToleranceG("透明公差G", Range(0.01, 1.0)) = 0.01                 _TransparencyToleranceB("透明公差B", Range(0.01, 1.0)) = 0.01         }           SubShader         {                 Pass                 {                         Tags{ "RenderType" = "Opaque" "Queue" = "Transparent" }                         //Tags{ "RenderType" = "Transparent" "Queue" = "Transparent" }                         Blend SrcAlpha OneMinusSrcAlpha                         //Blend One One                         LOD 200                         CGPROGRAM                           #pragma vertex vert                         #pragma fragment frag                         #include "UnityCG.cginc"                           struct vertInput                         {                                 float4 pos : POSITION;                                 float2 uv : TEXCOORD0;                         };                           struct vertOnput                         {                                 float4 pos : SV_POSITION;                                 float2 uv : TEXCOORD0;                         };                           vertOnput vert(vertInput input)                         {                                 vertOnput output;                                 output.pos = mul(UNITY_MATRIX_MVP, input.pos);                                 output.uv = input.uv;                                 return output;                         }                           sampler2D _MainTex;                         sampler2D _Background;                         float3 _TransparentColourKey;                         float _TransparencyToleranceR;                         float _TransparencyToleranceG;                         float _TransparencyToleranceB;                   /*        float Overlay(float base, float top)                         {                                 if (base < 0.5)                                 {                                         return 2 * base*top;                                 }                                 else                                 {                                         return 1 - 2 * (1 - base) * (1 - top);                                 }                         }*/                           float4 frag(vertInput input) : COLOR//SV_Target                         {                                 float4 color = tex2D(_MainTex, input.uv);                                 float deltaR = abs(color.r - _TransparentColourKey.r);                                 float deltaG = abs(color.g - _TransparentColourKey.g);                                 float deltaB = abs(color.b - _TransparentColourKey.b);                                 if (deltaR < _TransparencyToleranceR && deltaG < _TransparencyToleranceG && deltaB < _TransparencyToleranceB)                                 {                                         return float4(0.0f, 0.0f, 0.0f, 0.0f);                                 }                                 else                                 {                                         //float4 col = fixed4(0, 0, 0, 0);                                         //col.r = Overlay(color.r, color2.r);                                         //col.g = Overlay(color.g, color2.g);                                         //col.b = Overlay(color.b, color2.b);                                         //col.a = color.a;                                                        return color;                                 }                                        }                         ENDCG                 }         }         Fallback "Diffuse" } 最后新建一个脚本，定义变量 [C#] 纯文本查看 复制代码 ?   01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 public Material m_Material; [Range(0, 255)] public float transparentColourR = 1f; [Range(0, 255)] public float transparentColourG = 1f; [Range(0, 255)] public float transparentColourB = 1f; [Range(0,100)] public float transparencyToleranceR = 1f; [Range(0, 100)] public float transparencyToleranceG = 1f; [Range(0, 100)] public float transparencyToleranceB = 1f;   private int devId = 1; public string deviceName; private WebCamTexture photoTex; static int FrameWidth = 1920; static int FrameHeight = 1080; 在Update里写 [C#] 纯文本查看 复制代码 ?   1 2 3 4 5 6 7 8 transparentColour.r = transparentColourR / 255; transparentColour.g = transparentColourG / 255; transparentColour.b = transparentColourB / 255; transparentColour.a = 1; m_Material.SetColor("_TransparentColourKey", transparentColour); m_Material.SetFloat("_TransparencyToleranceR", transparencyToleranceR / 100); m_Material.SetFloat("_TransparencyToleranceG", transparencyToleranceG / 100); m_Material.SetFloat("_TransparencyToleranceB", transparencyToleranceB / 100); m_Material.SetTexture("_MainTex", photoTex); 打开摄像头 [C#] 纯文本查看 复制代码 ?   01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);   if (Application.HasUserAuthorization(UserAuthorization.WebCam)) {     WebCamDevice[] devices = WebCamTexture.devices; ;       //如果有后置摄像头，调用后置摄像头        for (int i = 0; i < devices.Length; i++)     {         if (!devices[i].isFrontFacing)         {             deviceName = devices[i].name;             break;         }     }       photoTex = new WebCamTexture(deviceName, FrameWidth, FrameHeight, 24);     photoTex.Play(); } Demo： 链接：http://pan.baidu.com/s/1i4QuTyl 密码：lee6