Shader—消融效果

效果图：

shader代码：// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'Shader "Custom/EdgeColo" {Properties    {        _MainTex ("Texture", 2D) = "white" {}        _NoiseTex("Noise", 2D) = "white" {}        _Threshold("Threshold", Range(0.0, 1.0)) = 0.5        _EdgeLength("Edge Length", Range(0.0, 0.2)) = 0.1        _EdgeColor("Edge Color", Color) = (1,1,1,1)    }    SubShader    {        Tags { "Queue"="Geometry" "RenderType"="Opaque" }        Pass        {            Cull Off //要渲染背面保证效果正确            CGPROGRAM            #pragma vertex vert            #pragma fragment frag            #include "UnityCG.cginc"            struct appdata            {                float4 vertex : POSITION;                float2 uv : TEXCOORD0;            };            struct v2f            {                float4 vertex : SV_POSITION;                float2 uvMainTex : TEXCOORD0;                float2 uvNoiseTex : TEXCOORD1;            };            sampler2D _MainTex;            float4 _MainTex_ST;            sampler2D _NoiseTex;            float4 _NoiseTex_ST;            float _Threshold;            float _EdgeLength;            fixed4 _EdgeColor;            v2f vert (appdata v)            {                v2f o;                o.vertex = UnityObjectToClipPos(v.vertex);                o.uvMainTex = TRANSFORM_TEX(v.uv, _MainTex);                o.uvNoiseTex = TRANSFORM_TEX(v.uv, _NoiseTex);                return o;            }            fixed4 frag (v2f i) : SV_Target            {                //镂空                fixed cutout = tex2D(_NoiseTex, i.uvNoiseTex).r;                clip(cutout - _Threshold);                //边缘颜色                if(cutout - _Threshold < _EdgeLength)                    return _EdgeColor;                fixed4 col = tex2D(_MainTex, i.uvMainTex);                return col;            }            ENDCG        }}}

使用方法：建一个材质球，选择此shader，然后选择一个噪声图（即：Noise），最后修改Threshold和EdgeLength参数即可看到效果