Shader "Myshader/Dissolve"
{
    Properties
    {
        _MainTex ("Texture", 2D) = "white" {}
        _BurnMap ("BurnMap",2D) ="white" {}
        _BurnAmount("BurnAmount",Range(0,1))=0
    }
    SubShader
    {
        Tags {"Queue"="Transparent" "RenderType" = "Opaque" "IgnoreProjectot"="true" }
        Pass
        {
            ZWrite Off
            Blend SrcAlpha OneMinusSrcAlpha
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #include "UnityCG.cginc"

            struct a2v
            {
                float4 vertex : POSITION;
                float4 texcoord : TEXCOORD0;
            };

            struct v2f
            {
                float4 pos : SV_POSITION;
                float2 uvMainTex : TEXCOORD0;
                float2 uvBurnMap : TEXCOORD2;
            };

            sampler2D _MainTex;
            sampler2D _BurnMap;
            float _BurnAmount;
            float4 _MainTex_ST;
            float4 _BurnMap_ST;

            v2f vert (a2v v)
            {
                v2f o;
                o.pos = UnityObjectToClipPos(v.vertex);
                o.uvMainTex = TRANSFORM_TEX(v.texcoord, _MainTex);
                o.uvBurnMap = TRANSFORM_TEX(v.texcoord, _BurnMap);
                return o;
            }

            fixed4 frag (v2f i) : SV_Target
            {
                fixed3 burn= tex2D(_BurnMap,i.uvBurnMap).rgb;
                fixed4 col = tex2D(_MainTex, i.uvMainTex);
                clip(burn.r - _BurnAmount);
                return col;
            }
            ENDCG
        }
    }
}