X ray shader problems need help

Hi I am trying to learn shaders and I'm waiting for a book on CG but at the moment I'm finding different shaders that have already been made but i have found a problem with a shaders that I would like to use the shaders link is:

http://unitycoder.com/blog/2012/02/22/x-ray-cutout-shader-with-mouse/

The problem that I am getting is that this shaders works on different game objects for example a standard cube and capsule within unity but if i add this shaders and script to an obj or to a fbx the whole object turns black and because of my lack of knowledge in shaders i don't know whats wrong.

The javascript code is:

Code (csharp):

1. // update object position to shader v1.0 - mgear - http://unitycoder.com/blog
2.  
3. #pragma strict
4.  
5. //var obj:Transform;
6. private var radius:float=2;
7.  
8.  
9. function Update ()
10. {
11.  
12.     // get mouse pos
13.     var ray = Camera.main.ScreenPointToRay (Input.mousePosition);
14.     var hit : RaycastHit;
15.     if (Physics.Raycast (ray, hit, Mathf.Infinity))
16.     {
17. //      renderer.material.SetVector("_ObjPos", Vector4(obj.position.x,obj.position.y,obj.position.z,0));
18.         renderer.material.SetVector("_ObjPos", Vector4(hit.point.x,hit.point.y,hit.point.z,0));
19.  
20.         // convert hit.point to our plane local coordinates, not sure how to do in shader.. IN.pos.. ??
21. //      var hitlocal = transform.InverseTransformPoint(hit.point);
22. //      renderer.material.SetVector("_ObjPos",Vector4(hitlocal.x,hitlocal.y,hitlocal.z,0));
23.        
24.     }
25.  
26.    
27.     // box rotation for testing..
28.     if (Input.GetKey ("a"))
29.     {
30.         transform.Rotate(Vector3(0,30,0) * Time.deltaTime);
31.     }
32.     if (Input.GetKey ("d"))
33.     {
34.         transform.Rotate(Vector3(0,-30,0) * Time.deltaTime);
35.     }
36.    
37.     // mousewheel for radius
38.     if (Input.GetAxis("Mouse ScrollWheel")!=0)
39.     {
40.         radius +=Input.GetAxis("Mouse ScrollWheel")*0.8;
41.         renderer.material.SetFloat( "_Radius", radius);
42.     }
43. }

the shaders code is:

Code (csharp):

1. // xray mouse pos shader test v1.0 - mgear - http://unitycoder.com/blog
2.  
3. Shader "mShaders/XRay1"
4. {
5.     Properties {
6.         _MainTex ("Base (RGB)", 2D) = "white" {}
7.         _ObjPos ("ObjPos", Vector) = (1,1,1,1)
8.         _Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
9.         _Radius ("HoleRadius", Range(0.1,5)) = 2
10.     }
11.     SubShader {
12.         Tags {"Queue"="AlphaTest" "IgnoreProjector"="False" "RenderType"="TransparentCutout"}
13.         Cull Off // draw backfaces also, comment this line if no need for backfaces
14.         AlphaTest Greater [_Cutoff]
15.        
16.         CGPROGRAM
17. //      #pragma target 3.0
18.         #pragma surface surf Lambert
19. //      #include "UnityCG.cginc"
20.  
21.         struct Input
22.         {
23.             float2 uv_MainTex;
24.            
25. //          float3 depth;
26. //          float4 pos;
27. //          float3 viewDir;
28.            
29.             float3 worldPos;
30. //          float3 worldRefl;
31. //          float3 worldNormal;
32. //          float4 screenPos;
33. //          INTERNAL_DATA
34.         };
35.        
36.         sampler2D _MainTex;
37.         uniform float4 _ObjPos;
38.         uniform float _Radius;
39.  
40.         void surf (Input IN, inout SurfaceOutput o)
41.         {
42.        
43.             half3 col = tex2D (_MainTex, IN.uv_MainTex).rgb;
44.  
45.             float dx = length(_ObjPos.x-IN.worldPos.x);
46.             float dy = length(_ObjPos.y-IN.worldPos.y);
47.             float dz = length(_ObjPos.z-IN.worldPos.z);
48.             float dist = (dx*dx+dy*dy+dz*dz)*_Radius;
49.             dist = clamp(dist,0.5,1);
50.            
51.             o.Albedo = col; // color is from texture
52.             o.Alpha = dist;  // alpha is from distance to the mouse
53.         }
54.         ENDCG
55.     }
56.     FallBack "Diffuse"
57. }
58.  

Any help would be much appreciated

thanks in advance

 

The object needs to have a collider attached to it, for the raycasting to work. Maybe that is what you are missing? Other than that, I can't see anything which would make primitives work, but not your mesh

 

i have put a mesh collider onto the object because it is the shape of a 3D plane but the object still turns black but i have also tested this out by creating a cube in blender and then just putting a simple box collider onto the object and it still sturns the object black any ideas ??

 

Maybe problem with UV mapping?
Test it by adding some basic uv mapping to the box in blender.

 

i have tried adding the uv mapping this did not work any other ideas??

 

If you can put the model for download, i can test it here also.