Unity四周渐变shader分享

Unity四周渐变shader分享

可调节颜色，输入贴图，调节渐变大小。效果如下（喜欢请点赞，谢谢）：

代码如下：

Shader "Zxj/jianbian"
{
	Properties
	{
		_Color("Main Color", Color) = (1,1,1,1)
		_MainTex("Main Texture", 2D) = "white" {}
	    _Smooth("Smooth", Range(0,1)) = 0
	}
		Subshader
	{
		Tags{ "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" }
		Pass
	{
		Blend SrcAlpha OneMinusSrcAlpha
		CGPROGRAM
#pragma vertex vert
#pragma fragment frag

    uniform half4 _Color;
	uniform sampler2D _MainTex;
    uniform float4 _MainTex_ST;
	uniform float _Smooth;

	struct vertexInput
	{
		float4 vertex : POSITION;
		float4 texcoord : TEXCOORD0;
	};
	struct vertexOutput
	{
		float4 pos : SV_POSITION;
		float4 texcoord : TEXCOORD0;
	};

	vertexOutput vert(vertexInput v)
	{
		vertexOutput o;
		o.pos = UnityObjectToClipPos(v.vertex);
		o.texcoord.xy = (v.texcoord.xy * _MainTex_ST.xy + _MainTex_ST.zw);
		return o;
	}

	half4 frag(vertexOutput i) : COLOR
	{
		float a = smoothstep(0, _Smooth, i.texcoord.x);
	    float b = smoothstep(1, 1 -  _Smooth, i.texcoord.x);
		float c = smoothstep(0, _Smooth, i.texcoord.y);
		float d = smoothstep(1, 1 - _Smooth, i.texcoord.y);
		float4 finalCol = tex2D(_MainTex, i.texcoord) * _Color;
		finalCol.a = a * b *c * d * _Color.a;
		return  finalCol;
	}
		ENDCG
	}
	}
}