# 指定のx位置より右側にある部分が消えるSurfaceシェーダー

DissappearablePositiveX.shader

Shader "Custom/DissappearablePositiveX"
{
    Properties
    {
        _Color ("Color", Color) = (1,1,1,1)
        _MainTex ("Albedo (RGB)", 2D) = "white" {}
        _Glossiness ("Smoothness", Range(0,1)) = 0.5
        _Metallic ("Metallic", Range(0,1)) = 0.0
		    _DissolvePosition("Dissolve Position", Range(0, 1000)) = 0
    }
    SubShader
    {
        Tags { "Queue" = "Transparent" "RenderType" = "Transparent" }
        LOD 200

        CGPROGRAM
        #pragma surface surf Standard fullforwardshadows vertex:vert alpha

        #pragma target 3.0

        sampler2D _MainTex;

        struct Input
        {
            float2 uv_MainTex : TEXCOORD0;
			      float3 pos : SV_POSITION;
        };

        half _Glossiness;
        half _Metallic;
        fixed4 _Color;
		    float _DissolvePosition;

        UNITY_INSTANCING_BUFFER_START(Props)
        // put more per-instance properties here
        UNITY_INSTANCING_BUFFER_END(Props)

        void vert(inout appdata_full v, out Input o){
            UNITY_INITIALIZE_OUTPUT(Input, o);
            o.pos = mul(unity_ObjectToWorld, v.vertex).xyz;
        }

        void surf (Input IN, inout SurfaceOutputStandard o)
        {
            fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
            o.Albedo = c.rgb;
            o.Metallic = _Metallic;
            o.Smoothness = _Glossiness;

            o.Alpha = 1;

            int a = IN.pos.x > _DissolvePosition ? 1.0 : 0.0;

            if(a == 1 ){
              discard;
            }
            
        }
        ENDCG
    }
    FallBack "Diffuse"
}