Unlit Speed tree Bilboard shader

Hi there!

I'm attempting to modify the speedtree billboard shader to not recieve any lighting. I would like it to react like an unlit shader. Since I'm not too experienced with shader programming, I have been unable to achieve what I want, even after experimenting for quite a while.

I don't know how difficult it is to do this, but I can imagine that it's actually quite simple.

I really hope that somebody knows what I could do to achieve this.

I'll paste the SpeedTree Billboard Shader below:

Thanks :)

 Shader "Nature/SpeedTree Billboard Unlit"
 {
     Properties
     {
         _Color ("Main Color", Color) = (1,1,1,1)
         _SpecColor ("Specular Color", Color) = (0.5, 0.5, 0.5, 0)
         _HueVariation ("Hue Variation", Color) = (1.0,0.5,0.0,0.1)
         _Shininess ("Shininess", Range (0.01, 1)) = 0.078125
         _MainTex ("Base (RGB)", 2D) = "white" {}
         _BumpMap ("Normalmap", 2D) = "bump" {}
         _Cutoff ("Alpha cutoff", Range(0,1)) = 0.5
         [MaterialEnum(None,0,Fastest,1)] _WindQuality ("Wind Quality", Range(0,1)) = 0
     }
     
     // targeting SM3.0+
     SubShader
     {
         Tags
         {
             "Queue"="AlphaTest"
             "IgnoreProjector"="True"
             "RenderType"="TransparentCutout"
             "DisableBatching"="LODFading"
         }
         LOD 400
         Cull Off
 
         CGPROGRAM
             #pragma surface surf Lambert vertex:SpeedTreeBillboardVert nolightmap addshadow
             #pragma target 3.0
             #pragma multi_compile __ LOD_FADE_CROSSFADE
             #pragma multi_compile __ BILLBOARD_FACE_CAMERA_POS
             #pragma shader_feature EFFECT_BUMP
             #pragma shader_feature EFFECT_HUE_VARIATION
             #define ENABLE_WIND
             #include "SpeedTreeBillboardCommon_Unlit.cginc"
 
             void surf(Input IN, inout SurfaceOutput OUT)
             {
                 SpeedTreeFragOut o;
                 SpeedTreeFrag(IN, o);
                 SPEEDTREE_COPY_FRAG(OUT, o)
             }
         ENDCG
 
         Pass
         {
             Tags { "LightMode" = "Vertex" }
 
             CGPROGRAM
                 #pragma vertex vert
                 #pragma fragment frag
                 #pragma target 3.0
                 #pragma multi_compile_fog
                 #pragma multi_compile __ LOD_FADE_CROSSFADE
                 #pragma multi_compile __ BILLBOARD_FACE_CAMERA_POS
                 #pragma shader_feature EFFECT_HUE_VARIATION
                 #define ENABLE_WIND
                 #include "SpeedTreeBillboardCommon_Unlit.cginc"
 
                 struct v2f
                 {
                     float4 vertex    : SV_POSITION;
                     UNITY_FOG_COORDS(0)
                     Input data        : TEXCOORD1;
                 };
 
                 v2f vert(SpeedTreeBillboardData v)
                 {
                     v2f o;
                     SpeedTreeBillboardVert(v, o.data);
                     o.data.color.rgb *= ShadeVertexLightsFull(v.vertex, v.normal, 4, true);
                     o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
                     UNITY_TRANSFER_FOG(o,o.vertex);
                     return o;
                 }
 
                 fixed4 frag(v2f i) : SV_Target
                 {
                     SpeedTreeFragOut o;
                     SpeedTreeFrag(i.data, o);
                     fixed4 c = fixed4(o.Albedo, o.Alpha);
                     UNITY_APPLY_FOG(i.fogCoord, c);
                     return c;
                 }
             ENDCG
         }
     }
 
     // targeting SM2.0: Cross-fading, Hue variation and Camera-facing billboard are turned off for less instructions
     SubShader
     {
         Tags
         {
             "Queue"="AlphaTest"
             "IgnoreProjector"="True"
             "RenderType"="TransparentCutout"
         }
         LOD 400
         Cull Off
 
         CGPROGRAM
             #pragma surface surf Lambert vertex:SpeedTreeBillboardVert nolightmap
             #pragma shader_feature EFFECT_BUMP
             #include "SpeedTreeBillboardCommon_Unlit.cginc"
 
             void surf(Input IN, inout SurfaceOutput OUT)
             {
                 SpeedTreeFragOut o;
                 SpeedTreeFrag(IN, o);
                 SPEEDTREE_COPY_FRAG(OUT, o)
             }
         ENDCG
 
         Pass
         {
             Tags { "LightMode" = "Vertex" }
 
             CGPROGRAM
                 #pragma vertex vert
                 #pragma fragment frag
                 #pragma multi_compile_fog
                 #include "SpeedTreeBillboardCommon_Unlit.cginc"
 
                 struct v2f 
                 {
                     float4 vertex    : SV_POSITION;
                     UNITY_FOG_COORDS(0)
                     Input data        : TEXCOORD1;
                 };
 
                 v2f vert(SpeedTreeBillboardData v)
                 {
                     v2f o;
                     SpeedTreeBillboardVert(v, o.data);
                     o.data.color.rgb *= ShadeVertexLightsFull(v.vertex, v.normal, 2, false);
                     o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
                     UNITY_TRANSFER_FOG(o,o.vertex);
                     return o;
                 }
 
                 fixed4 frag(v2f i) : SV_Target
                 {
                     SpeedTreeFragOut o;
                     SpeedTreeFrag(i.data, o);
                     fixed4 c = fixed4(o.Albedo, o.Alpha);
                     UNITY_APPLY_FOG(i.fogCoord, c);
                     return c;
                 }
             ENDCG
         }
     }
 
     FallBack "Transparent/Cutout/VertexLit"
 }