Problems with directional light...

I've got a problem with light. Again.
The problem is that UNITY_LIGHT_ATTENUATION always returns a white color.

Code (CSharp):

1. Shader "Unlit/Test"
2. {
3.     Properties
4.     {
5.     }
6.     SubShader
7.     {
8.         Tags {
9.         "Queue" = "Geometry"
10.         "RenderType" = "Opaque"
11.     }
12.         LOD 100
13.  
14.         Pass
15.         {
16.             Tags {
17.                 "LightMode" = "ForwardBase"
18.             }
19.             CGPROGRAM
20.             #pragma vertex vert
21.             #pragma fragment frag
22.             #pragma target 3.0
23.             #include "UnityCG.cginc"
24.             #include "AutoLight.cginc"
25.             #pragma multi_compile_fwdbase
26.  
27.             struct appdata
28.             {
29.                 float4 vertex : POSITION;
30.                 float2 uv : TEXCOORD0;
31.             };
32.  
33.             struct v2f
34.             {
35.                 float2 uv : TEXCOORD0;
36.                 float4 pos : SV_POSITION;
37.                 float4 vert : TEXCOORD3;
38.                 LIGHTING_COORDS(1, 2)
39.             };
40.  
41.             v2f vert (appdata v)
42.             {
43.                 v2f o;
44.                 o.pos = UnityObjectToClipPos(v.vertex);
45.                 o.uv = v.uv;
46.                 o.vert = mul(unity_ObjectToWorld, v.vertex);
47.                 TRANSFER_VERTEX_TO_FRAGMENT(o);
48.                 return o;
49.             }
50.  
51.             fixed4 frag (v2f i) : SV_Target
52.             {
53.                 UNITY_LIGHT_ATTENUATION(atten, i, i.vert.xyz);
54.  
55.                 return atten;
56.             }
57.             ENDCG
58.         }
59.     }
60. }
61.  

Any help will be appretiated.

 

You need a shadowcaster pass, or a fallback with a shadowcaster pass.

Add this before the last close brace (}).

FallBack "Legacy Shaders/VertexLit"

 

@bgolus, but I don't need shadow casting. Or is it strictly required for UNITY_LIGHT_ATTENUATION to run?

 

Unity's main directional light shadow receiving also uses the shadow caster pass. Unity renders out a depth texture, then casts the main directional light's shadow on the world position extrapolated from the depth texture. The depth texture is generated by rendering opaque objects' shadow caster pass.