scaner.shader

Shader "Unlit/scaner"
{
    Properties
    {
        _DepthTexture ("Depth", 2D) = "white" {}
        _ColorTexture ("Color", 2D) = "white" {}
		depthlength ("Depth Length",Float) = 5
        

    }
    SubShader
    {
        Tags { "RenderType"="Opaque" }
        LOD 100
        Cull Off
        ZWrite On
        Pass
        {
            CGPROGRAM
            #pragma vertex vert
			#pragma geometry geom
            #pragma fragment frag
            // make fog work
            #pragma multi_compile_fog

            #include "UnityCG.cginc"

            
            struct particleData{
                float3 pos; // Particle Position
                float3 col;
            };


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

            struct v2f
            {
                float2 uv : TEXCOORD0;
                float4 vertex : SV_POSITION;
            };

            sampler2D _DepthTexture;
            sampler2D _ColorTexture;
			float3 _ParticleMul;
			float4 _ParticleOffset;
            float _height;
            float depthlength;

            v2f vert (appdata v)
            {
                v2f o;
                o.vertex = v.vertex;
                o.uv = v.uv;
                return o;
            }

			[maxvertexcount(3)]
			void geom(triangle v2f i[3], inout TriangleStream<v2f> outStream)
			{

                
                v2f o;
                [unroll]
                for (int j = 0; j < 3; j++)
                {
                    float2 uv = i[j].uv;
                    float y = tex2Dlod(_DepthTexture,float4(uv,0,0)).x;
                    // 頂点シェーダからもらった3頂点それぞれを射影変換して通常のレンダリングと同様にポリゴン位置を決める
                    v2f v = i[j];

                    v.vertex += float4(0,0,y*depthlength,0);
                    o.vertex = UnityObjectToClipPos(v.vertex);
                    
                    o.uv = uv;
                    outStream.Append(o);
                }

                outStream.RestartStrip();
			}



            fixed4 frag (v2f i) : SV_Target
            {
                // sample the texture
                fixed4 col = tex2D(_ColorTexture, i.uv);
                fixed d = tex2D(_DepthTexture,i.uv);

                if (d < 0.01){
                    discard;
                }
                col = tex2D(_ColorTexture,i.uv);
                return col;
            }
            ENDCG
        }
    }
}