Ambient Light(UNITY_LIGHTMODEL_AMBIENT) removed in Unity 5.0?

Unity Engine
1

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??

    Properties
    {
        _Color ("Color", Color) = (1.0, 1.0, 1.0, 1.0)
    }
    SubShader
    {
        Pass
        {
        Tags {"LightMode" = "ForwardBase"}
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
          
            //user defined
            uniform float4 _Color;
          
            //unity defined
            uniform float4 _LightColor0;
          
            ///base structs
            struct vertexInput
            {
                float4 vertex : POSITION;
                float3 normal : NORMAL;
            };
            struct vertexOutput
            {
                float4 pos : SV_POSITION;
                float4 col : COLOR;  
            };
          
            //vertex function
            vertexOutput vert(vertexInput v)
            {
              
                vertexOutput o;
                float3 normalDirection = normalize(mul(float4(v.normal, 0.0), _World2Object).xyz);
                float3 lightDirection;
                float atten = 1.0;
              
                lightDirection = normalize( _WorldSpaceLightPos0.xyz);
                float3 diffuseReflection = max(0.0, (atten * _LightColor0.xyz * dot(normalDirection , lightDirection)));
                float3 finalLight =  2 *(diffuseReflection + UNITY_LIGHTMODEL_AMBIENT.xyz);
              
                o.col = float4(finalLight * _Color.rgb , 1.0);
                o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
                return o;
            }
          
            //fragment shader
            float4 frag(vertexOutput i) : COLOR
            {
                return i.col;
            }
            ENDCG
        }
    }
}

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?

2

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).

//vertext func
            vertexOutput vert(vertexInput v) {
                vertexOutput o;

                float3 normalDirection = normalize( mul(float4(v.normal, 0.0), _World2Object).xyz );
                float lightDirection;
                float atten = 1.0;

                lightDirection = normalize(_WorldSpaceLightPos0.xyz);

                float3 diffuseReflection = atten * _LightColor0.xyz * max( 0.0, dot(lightDirection, normalDirection) );
                float3 lightFinal = diffuseReflection + UNITY_LIGHTMODEL_AMBIENT.xyz;

                o.col = float4(lightFinal * _Color.rgb, 1.0);
                o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
                return o;
            }
3

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.