DirectX 11 tessellation not working

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1

Hi all,
I am trying to have the most basic DirectX tessellation shader to work.

  • My graphics card (nvidia geforce GTX
    560 ti) supports DirectX 11
  • I verified with dxdiag.exe that I
    have DirectX 11 installed
  • I use Windows 7 and Unity 4.0.0b7
    with DirectX 11 definitely activated
    both in Player Settings and in Preferences > General.
  • I gave all the required textures correctly (diffuse, heightmap and normal map).

The following shader is an EXAMPLE coming from THIS LINK and it just doesn’t work. I don’t see any tessellation happening.

Shader "Tessellation Sample" {
        Properties {
            _EdgeLength ("Edge length", Range(2,50)) = 15
            _MainTex ("Base (RGB)", 2D) = "white" {}
            _DispTex ("Disp Texture", 2D) = "gray" {}
            _NormalMap ("Normalmap", 2D) = "bump" {}
            _Displacement ("Displacement", Range(0, 1.0)) = 0.3
            _Color ("Color", color) = (1,1,1,0)
            _SpecColor ("Spec color", color) = (0.5,0.5,0.5,0.5)
        }
        SubShader {
            Tags { "RenderType"="Opaque" }
            LOD 300

            CGPROGRAM
            #pragma surface surf BlinnPhong addshadow fullforwardshadows vertex:disp tessellate:tessEdge nolightmap
            #pragma target 5.0
            #include "Tessellation.cginc"

            struct appdata {
                float4 vertex : POSITION;
                float4 tangent : TANGENT;
                float3 normal : NORMAL;
                float2 texcoord : TEXCOORD0;
            };

            float _EdgeLength;

            float4 tessEdge (appdata v0, appdata v1, appdata v2)
            {
                return UnityEdgeLengthBasedTess (v0.vertex, v1.vertex, v2.vertex, _EdgeLength);
            }

            sampler2D _DispTex;
            float _Displacement;

            void disp (inout appdata v)
            {
                float d = tex2Dlod(_DispTex, float4(v.texcoord.xy,0,0)).r * _Displacement;
                v.vertex.xyz += v.normal * d;
            }

            struct Input {
                float2 uv_MainTex;
            };

            sampler2D _MainTex;
            sampler2D _NormalMap;
            fixed4 _Color;

            void surf (Input IN, inout SurfaceOutput o) {
                half4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
                o.Albedo = c.rgb;
                o.Specular = 0.2;
                o.Gloss = 1.0;
                o.Normal = UnpackNormal(tex2D(_NormalMap, IN.uv_MainTex));
            }
            ENDCG
        }
        FallBack "Diffuse"
    }

Console shows this warning:

Shader warning in 'Custom/TessallationBasic': Program 'tessvert_surf', undeclared identifier 'UnityEdgeLengthBasedTess' (compiling for d3d11) at line 93

Thanks in advance for your attention.

Steak

Temporary post scriptum: At the moment the search server is totally down so I couldn’t crawl around very much looking for a solution before asking. I don’t see lot of information out there anyway on these topics. I might delete this post if I see it’s a duplicate soon. (I like to be tidy)

1 Answer

1
2

Hello Riccardo!

Seems to work fine for me. It’s because you aren’t running the latest version of Unity, these functions didn’t exist when the beta version was around.