OcclusionMap

Hello!

Trying to add Occolusion to a doublesided shader.

Here is what im adding to the script

Code (csharp):

1.  
2. _OcclusionMap("Occlusion", 2D) = "white" {}
3. sampler2D _OcclusionMap;
4. fixed occlusion = tex2D(_OcclusionMap, i.uv).r;
5. c.rgb *= occlusion;
6.  

But i getting a error "undeclared identifier '_OcclusionMap' at line 52 (on d3d11)" And makes the mesh pink
Is there a better way to add Occolusion?

Here is the full code with Occolusion added, the lines are marked "//Added Code" at the right side

Code (csharp):

1.  
2. Shader "Custom/Two Sided SurfaceShader" {
3.     Properties {
4.         _Color ("Color", Color) = (1,1,1,1)
5.         [NoScaleOffset] _MainTex ("Albedo (RGB)", 2D) = "white" {}
6.         [NoScaleOffset] _OcclusionMap("Occlusion", 2D) = "white" {} //Added Code
7.         [Toggle] _UseMetallicMap ("Use Metallic Map", Float) = 0.0
8.         [NoScaleOffset] _MetallicGlossMap("Metallic", 2D) = "black" {}
9.         [Gamma] _Metallic ("Metallic", Range(0,1)) = 0.0
10.         _Glossiness ("Smoothness", Range(0,1)) = 0.5
11.         _BumpScale("Scale", Float) = 1.0
12.         [NoScaleOffset] _BumpMap("Normal Map", 2D) = "bump" {}
13.         _Cutoff("Alpha Cutoff", Range(0.01,1)) = 0.5
14.     }
15.     SubShader {
16.         Tags { "Queue"="AlphaTest" "IgnoreProjector"="True" "RenderType"="TransparentCutout" }
17.         Blend SrcAlpha OneMinusSrcAlpha
18.         LOD 200
19.         ZWrite Off
20.         Cull Off
21.  
22.         Pass {
23.             ColorMask 0
24.             ZWrite On
25.  
26.             CGPROGRAM
27.             #pragma vertex vert
28.             #pragma fragment frag
29.          
30.             #include "UnityCG.cginc"
31.  
32.             struct v2f {
33.                 float4 vertex : SV_POSITION;
34.                 float2 texcoord : TEXCOORD0;
35.             };
36.  
37.             sampler2D _MainTex;
38.             fixed _Cutoff;
39.  
40.             v2f vert (appdata_img v)
41.             {
42.                 v2f o;
43.                 o.vertex = UnityObjectToClipPos(v.vertex);
44.                 o.texcoord = v.texcoord;
45.                 return o;
46.             }
47.  
48.             fixed4 frag (v2f i) : SV_Target
49.             {
50.                 fixed4 col = tex2D(_MainTex, i.texcoord);
51.                 fixed occlusion = tex2D(_OcclusionMap, i.uv).r; //Added Code
52.                 clip(col.a - _Cutoff);
53.                 c.rgb * = occlusion; //Added Code
54.                 return 0;
55.             }
56.             ENDCG
57.         }
58.  
59.         Pass
60.         {
61.             Tags {"LightMode"="ShadowCaster"}
62.             ZWrite On
63.             Cull Off
64.  
65.             CGPROGRAM
66.             #pragma vertex vert
67.             #pragma fragment frag
68.             #pragma multi_compile_shadowcaster
69.             #include "UnityCG.cginc"
70.  
71.             struct v2f {
72.                 V2F_SHADOW_CASTER;
73.                 float2 texcoord : TEXCOORD1;
74.             };
75.  
76.             v2f vert(appdata_base v)
77.             {
78.                 v2f o;
79.                 TRANSFER_SHADOW_CASTER_NORMALOFFSET(o)
80.                 o.texcoord = v.texcoord;
81.                 return o;
82.             }
83.          
84.             sampler2D _MainTex;
85.             fixed _Cutoff;
86.  
87.             float4 frag(v2f i) : SV_Target
88.             {
89.                 fixed4 col = tex2D(_MainTex, i.texcoord);
90.                 clip(col.a - _Cutoff);
91.                 SHADOW_CASTER_FRAGMENT(i)
92.             }
93.             ENDCG
94.         }
95.      
96.         CGPROGRAM
97.         #pragma surface surf Standard fullforwardshadows alpha:fade nolightmap
98.         #pragma shader_feature _USEMETALLICMAP_ON
99.         #pragma target 3.0
100.  
101.         sampler2D _MainTex;
102.         sampler2D _OcclusionMap; //Added Code
103.         sampler2D _MetallicGlossMap;
104.         sampler2D _BumpMap;
105.  
106.  
107.         struct Input {
108.             float2 uv_MainTex;
109.             fixed facing : VFACE;
110.         };
111.  
112.         half _Glossiness;
113.         half _Metallic;
114.         fixed4 _Color;
115.         half _BumpScale;
116.         fixed _Cutoff;
117.  
118.         void surf (Input IN, inout SurfaceOutputStandard o) {
119.             // Albedo comes from a texture tinted by color
120.             fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
121.             o.Albedo = c.rgb;
122.  
123.             #ifdef _USEMETALLICMAP_ON
124.             fixed4 mg = tex2D(_MetallicGlossMap, IN.uv_MainTex);
125.             o.Metallic = mg.r;
126.             o.Smoothness = mg.a;
127.             #else
128.             o.Metallic = _Metallic;
129.             o.Smoothness = _Glossiness;
130.             #endif
131.  
132.             // Rescales the alpha on the blended pass
133.             o.Alpha = saturate(c.a / _Cutoff);
134.  
135.             o.Normal = UnpackScaleNormal(tex2D(_BumpMap, IN.uv_MainTex), _BumpScale);
136.  
137.             if (IN.facing < 0.5)
138.                 o.Normal *= -1.0;
139.         }
140.         ENDCG
141.     }
142.     FallBack "Diffuse"
143. }
144.  

 

I'm just guessing as I'm not super experienced with ShaderLab, but it looks like you're missing a "sampler2D _OcclusionMap" in the first pass block.

Have a look at line 37 in your pasted code, and observe that _MainTex is defined there, but not the occlusion map. Yet you're trying to use it on line 51 (or 52 since that's what the error says)

 

If i "sampler2D _OcclusionMap" there i getting errors.

Code (csharp):

1. Shader error in 'Custom/Two Sided SurfaceShader': 'tex2D': no matching 2 parameter intrinsic function; Possible intrinsic functions are: tex2D(sampler2D, float2|half2|min10float2|min16float2) tex2D(sampler2D, float2|half2|min10float2|min16float2, float2|half2|min10float2|min16float2, float2|half2|min10float2|min16float2) at line 53 (on d3d11)

And this

Code (csharp):

1. Shader error in 'Custom/Two Sided SurfaceShader': invalid subscript 'uv' at line 53 (on d3d11)

This is line 53

Code (csharp):

1. fixed occlusion = tex2D(_OcclusionMap, i.uv).r;

 

It looks like that first error was caused by the second error. It says "invalid subscript 'uv'", which is because your v2f struct doesn't contain a uv field. You may need to add that.