Ambient Light(UNITY_LIGHTMODEL_AMBIENT) removed in Unity 5.0?

I was following the tutorial on CGCookie on writing shaders in Unity. And when i wrote the code to add ambient light to the shader, it just did not work. I tried the same code in Unity 4.6 and it works. Am i doing anything wrong??

Code (CSharp):

1.     Properties
2.     {
3.         _Color ("Color", Color) = (1.0, 1.0, 1.0, 1.0)
4.     }
5.     SubShader
6.     {
7.         Pass
8.         {
9.         Tags {"LightMode" = "ForwardBase"}
10.             CGPROGRAM
11.             #pragma vertex vert
12.             #pragma fragment frag
13.          
14.             //user defined
15.             uniform float4 _Color;
16.          
17.             //unity defined
18.             uniform float4 _LightColor0;
19.          
20.             ///base structs
21.             struct vertexInput
22.             {
23.                 float4 vertex : POSITION;
24.                 float3 normal : NORMAL;
25.             };
26.             struct vertexOutput
27.             {
28.                 float4 pos : SV_POSITION;
29.                 float4 col : COLOR;  
30.             };
31.          
32.             //vertex function
33.             vertexOutput vert(vertexInput v)
34.             {
35.              
36.                 vertexOutput o;
37.                 float3 normalDirection = normalize(mul(float4(v.normal, 0.0), _World2Object).xyz);
38.                 float3 lightDirection;
39.                 float atten = 1.0;
40.              
41.                 lightDirection = normalize( _WorldSpaceLightPos0.xyz);
42.                 float3 diffuseReflection = max(0.0, (atten * _LightColor0.xyz * dot(normalDirection , lightDirection)));
43.                 float3 finalLight =  2 *(diffuseReflection + UNITY_LIGHTMODEL_AMBIENT.xyz);
44.              
45.                 o.col = float4(finalLight * _Color.rgb , 1.0);
46.                 o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
47.                 return o;
48.             }
49.          
50.             //fragment shader
51.             float4 frag(vertexOutput i) : COLOR
52.             {
53.                 return i.col;
54.             }
55.             ENDCG
56.         }
57.     }
58. }

i tried to change this line
float3 finalLight = 2 *(diffuseReflection + UNITY_LIGHTMODEL_AMBIENT.xyz);
to
float3 finalLight = 2 *( UNITY_LIGHTMODEL_AMBIENT.xyz);
just to check if it is working and the mesh is completely black after this change.
Is this a bug or has anything been changed?

 

It works in Unity 5.
I use 5.3.1 ver, My problem was - I wrote '*' instead of '+' UNITY_LIGHTMODEL_AMBIENT.
You can use my code (from GCCookie).

Code (CSharp):

1. //vertext func
2.             vertexOutput vert(vertexInput v) {
3.                 vertexOutput o;
4.  
5.                 float3 normalDirection = normalize( mul(float4(v.normal, 0.0), _World2Object).xyz );
6.                 float lightDirection;
7.                 float atten = 1.0;
8.  
9.                 lightDirection = normalize(_WorldSpaceLightPos0.xyz);
10.  
11.                 float3 diffuseReflection = atten * _LightColor0.xyz * max( 0.0, dot(lightDirection, normalDirection) );
12.                 float3 lightFinal = diffuseReflection + UNITY_LIGHTMODEL_AMBIENT.xyz;
13.  
14.                 o.col = float4(lightFinal * _Color.rgb, 1.0);
15.                 o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
16.                 return o;
17.             }

 

This was a problem in during the beta stage of Unity 5.0, this was before Unity 5 was officially released. I sent Unity a bug report, they acknowledged that it was a bug and fixed the bug in the next beta build. Should have updated this thread with the information, thanks though.