Question by kkl888 · Jul 12, 2018 at 08:13 AM · lighting surface shader second lighting-model

Get second light data from surface shader custom lighting model

How can we get second light data such as light direction, light color, light attenuation and view direction from surface shader?

Here's the code I'm using now:

 Shader "Mobile/Bumped Specular" {
 Properties {
     [PowerSlider(5.0)] _Shininess ("Shininess", Range (0.03, 1)) = 0.078125
     _MainTex ("Base (RGB) Gloss (A)", 2D) = "white" {}
     [NoScaleOffset] _BumpMap ("Normalmap", 2D) = "bump" {}
 }
 SubShader {
     Tags { "RenderType"="Opaque" }
     LOD 250
 
 CGPROGRAM
 #pragma surface surf MobileBlinnPhong exclude_path:prepass nolightmap noforwardadd halfasview interpolateview
 
 inline fixed4 LightingMobileBlinnPhong (SurfaceOutput s, fixed3 lightDir, fixed3 halfDir, fixed atten)
 {
     fixed diff = max (0, dot (s.Normal, lightDir));
     fixed nh = max (0, dot (s.Normal, halfDir));
     fixed spec = pow (nh, s.Specular*128) * s.Gloss;
 
     fixed4 c;
     c.rgb = (s.Albedo * _LightColor0.rgb * diff + _LightColor0.rgb * spec) * atten;
     UNITY_OPAQUE_ALPHA(c.a);
     return c;
 }
 
 sampler2D _MainTex;
 sampler2D _BumpMap;
 half _Shininess;
 
 struct Input {
     float2 uv_MainTex;
 };
 
 void surf (Input IN, inout SurfaceOutput o) {
     fixed4 tex = tex2D(_MainTex, IN.uv_MainTex);
     o.Albedo = tex.rgb;
     o.Gloss = tex.a;
     o.Alpha = tex.a;
     o.Specular = _Shininess;
     o.Normal = UnpackNormal (tex2D(_BumpMap, IN.uv_MainTex));
 }
 ENDCG
 }
 
 FallBack "Mobile/VertexLit"
 }

The custom lighting model provides only first light data.

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