PointCloudShader

Shader "Custom/SpherePoint" {
     Properties {
         _Color ("Color", Color) = (1,1,1,1)
         _Radius ("Sphere Radius", float) = 0.01
     }
     SubShader {
         Tags { "RenderType"="Opaque" }
         LOD 200
         Cull Off
         Pass {
             CGPROGRAM
             #pragma vertex vert
             #pragma fragment frag
             #pragma geometry geom
             #pragma target 4.0                    // Use shader model 3.0 target, to get nicer looking lighting
             #include "UnityCG.cginc"
             struct vertexIn {
                 float4 pos : POSITION;
                 float4 color : COLOR;
                 float3 normal : NORMAL;
             };
             struct vertexOut {
                 float4 pos : POSITION;
                 float4 color : COLOR0;
                 float3 normal : NORMAL;
             };
             struct geomOut {
                 float4 pos : POSITION;
                 float4 color : COLO0R;
                 float3 normal : NORMAL;
             };
             //Vertex shader: computes normal wrt camera
             vertexOut vert (vertexIn i) {
                 vertexOut o;
                 o.pos = UnityObjectToClipPos(i.pos);
                 o.color = i.color;
                 o.normal = ObjSpaceViewDir(o.pos);
                 return o;
             }
             float _Radius;
             static const fixed SQRT3_6 = sqrt(3)/6;
             float4 _Color;
             [maxvertexcount(3)]
             void geom(point vertexOut i[1], inout TriangleStream<geomOut> OutputStream)
             {
                 geomOut p;
                 float a = _ScreenParams.x / _ScreenParams.y; // aspect ratio
                 float s = _Radius;
                 float s2 = s*SQRT3_6 *a;

                 p.color = i[0].color * _Color;
                 p.normal = float3(0,0,1);
                 p.pos = i[0].pos + float4(0,s2*2,0,0);
                 OutputStream.Append(p);
                 p.pos = i[0].pos + float4(-s*0.5f,-s2,0,0);
                 OutputStream.Append(p);
                 p.pos = i[0].pos + float4(s*0.5f,-s2,0,0);
                 OutputStream.Append(p);
                 OutputStream.RestartStrip();
             }

             float4 frag(geomOut i) : COLOR
             {
                 return i.color;
             }
             ENDCG
         }
     }
     FallBack "Diffuse"
}