Demo 46 - Tessellation depending distance camera

Shader "Custom/Tessellation"
{
    Properties {
        _Tess ("Tessellation value", Range(0, 20)) = 1
        _DistMin ("Distance min", float) = 0
        _DistMax ("Distance max", float) = 1
    }
    Subshader {

        Tags { "Queue"="Geometry" }

            CGPROGRAM
            #pragma surface surf Standard vertex:vert tessellate:tess
            #pragma target 4.6
            #include "UnityCG.cginc"
            #include "Tessellation.cginc"

            struct Input {
                float3 worldPos;
            };

            float _Tess;

            float _DistMin;
            float _DistMax;

            float4 tess(appdata_base v0, appdata_base v1, appdata_base v2)
            {
                return UnityDistanceBasedTess(v0.vertex, v1.vertex, v2.vertex, _DistMin, _DistMax, _Tess);
            }

            void vert(inout appdata_base v ){}

            void surf(Input IN, inout SurfaceOutputStandard o)
            {
                o.Albedo = fixed4(1, 1, 1, 1);
            }

            ENDCG
    }
}