Unity 2019 Billboard Shader

Shader "Custom/Billboard"
{
    Properties
    {
        _MainTex("Texture", 2D) = "white" {}
    }
        SubShader
    {
        Tags{ "Queue" = "Transparent" "IgnoreProjector" = "True" "RenderType" = "Transparent" "DisableBatching" = "True" }

        ZWrite Off
        Blend SrcAlpha OneMinusSrcAlpha

        Pass
        {
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            // make fog work
            #pragma multi_compile_fog

            #include "UnityCG.cginc"

            struct appdata
            {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
            };

            struct v2f
            {
                float2 uv : TEXCOORD0;
                UNITY_FOG_COORDS(1)
                float4 pos : SV_POSITION;
            };

            sampler2D _MainTex;
            float4 _MainTex_ST;

            v2f vert(appdata v)
            {
                v2f o;
                o.pos = UnityObjectToClipPos(v.vertex);
                o.uv = v.uv.xy;

                // billboard mesh towards camera
                float3 vpos = mul((float3x3)unity_ObjectToWorld, v.vertex.xyz);
                float4 worldCoord = float4(unity_ObjectToWorld._m03, unity_ObjectToWorld._m13, unity_ObjectToWorld._m23, 1);
                float4 viewPos = mul(UNITY_MATRIX_V, worldCoord) + float4(vpos, 0);
                float4 outPos = mul(UNITY_MATRIX_P, viewPos);

                o.pos = outPos;

                UNITY_TRANSFER_FOG(o,o.vertex);
                return o;
            }

            fixed4 frag(v2f i) : SV_Target
            {
                // sample the texture
                fixed4 col = tex2D(_MainTex, i.uv);
            // apply fog
            UNITY_APPLY_FOG(i.fogCoord, col);
            return col;
        }
        ENDCG
    }
    }
}