Adding shadows to a shader

Hi everyone,

I have a simple grayscale shader, which does not receive shadows.
I've tried a few solutions I found with no success.
Does someone know how my shader can take into account shadows?

Here it is :

Code (CSharp):

1. Shader "Custom/GreyScale" {
2.     Properties{
3.         _MainTex("Texture", 2D) = "white" { }
4.         _Factor("Factor", Range(0, 1.0)) = 0.6
5.     }
6.         SubShader{
7.             Tags { "RenderType" = "Opaque" }
8.             LOD 150
9.             Pass {
10.  
11.         CGPROGRAM
12.         #pragma vertex vert
13.         #pragma fragment frag
14.  
15.         #include "UnityCG.cginc"
16.  
17.         sampler2D _MainTex;
18.         float _Factor;
19.  
20.         struct v2f {
21.             float4  pos : SV_POSITION;
22.             float2  uv : TEXCOORD0;
23.         };
24.  
25.         float4 _MainTex_ST;
26.  
27.         v2f vert(appdata_base v)
28.         {
29.             v2f o;
30.             o.pos = UnityObjectToClipPos(v.vertex);
31.             o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
32.             return o;
33.         }
34.  
35.         half4 frag(v2f i) : COLOR
36.         {
37.             half4 texcol = tex2D(_MainTex, i.uv);
38.             texcol.rgb = dot(texcol.rgb, float3(0.3, 0.59, 0.11)) * _Factor;
39.             return texcol;
40.         }
41.         ENDCG
42.  
43.             }
44.     }
45.         Fallback "Diffuse"
46. }

Thanks

 

Hi,

Did you check the manual? (Vertex and fragment shader examples)
https://docs.unity3d.com/Manual/SL-VertexFragmentShaderExamples.html

There's a section called "Receiving shadows".

It's almost a step by step guide on how to add basic shadows to a vert/frag shader.

If you get stuck you can ask for more help.