Unity ColorKey Shader

乱调了一个 colorKey 的 shader，网上找了半天看的都好复杂，随便调了个能用的，能用就好。。。
//双面 精度是 0.1 的，可以自定义每个通道的容差范围

Shader "Custom/TextureColorKey" {
Properties
{
_MainTex("Base (RGB)", 2D) = "white" {}
_Alpha("Alpha", float) = 1.0
_ColorKey("ColorKey", Color) = (1,1,1,1)
}

	SubShader{
	Tags{ "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" }
	LOD 100

	Cull Off
	Blend SrcAlpha OneMinusSrcAlpha
	LOD 100

	Pass{
	CGPROGRAM
	#pragma vertex vert
	#pragma fragment frag
	#pragma target 2.0
	#pragma multi_compile_fog

	#include "UnityCG.cginc"

		struct appdata_t {
		float4 vertex : POSITION;
		float2 texcoord : TEXCOORD0;
	};

	struct v2f {
		float4 vertex : SV_POSITION;
		half2 texcoord : TEXCOORD0;
		UNITY_FOG_COORDS(1)
	};

	sampler2D _MainTex;
	float4 _MainTex_ST;
	float _Alpha;
	fixed4 _ColorKey;
	v2f vert(appdata_t v)
	{
		v2f o;
		o.vertex = UnityObjectToClipPos(v.vertex);
		o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
		UNITY_TRANSFER_FOG(o,o.vertex);
		return o;
	}

	fixed4 frag(v2f i) : SV_Target
	{
		fixed4 col = tex2D(_MainTex, i.texcoord);
		UNITY_APPLY_FOG(i.fogCoord, col);
		if (abs(col.r - _ColorKey.r) <= 0.1 && abs(col.g - _ColorKey.g) <= 0.1 && abs(col.b - _ColorKey.b) <= 0.1)
			col.a = 0;
		else
			col.a = _Alpha;
		col.rgb *= _Color.rgb;
	return col;
	}
		ENDCG
	}
	}

}
自己测试是可以过滤颜色的，只要物品颜色和颜色键颜色不要太近似就好，否则连物品颜色也会透明