Greyscale to color at specified locations

Hey everyone,

I am hoping I may be able to get some help with some hlsl shader code. We are trying to achieve greyscale across a level and when an item is placed in a location, that area turns to color. This script works in a single location but we are trying to achieve this in multiple locations within the level. I have tried adding an array that stores the locations but unfortunately it only passes the first location from the C# script Array in which I use Shader.SetGlobalVectorArray();.

I have minimal knowledge when it comes to hlsl and shaders, so any help and/or guidance would be great. Also if there is an easier way to achieve this effect, I would love to be pointed in the right direction. Thanks in advance.

This is the hlsl script that I have been using to achieve the effect.

Code (CSharp):

1. Shader "Custom/SphericalMask"
2. {
3.     Properties
4.     {
5.         _Color ("Color", Color) = (1,1,1,1)
6.         _MainTex ("Albedo (RGB)", 2D) = "white" {}
7.         _ColorStrength("Color Strength", Range(1,4)) = 1
8.         _EmissionColor("Emission Color", Color) = (1,1,1,1)
9.         _EmissionTex("Emission (RGB)", 2D) = "white" {}
10.         _EmissionStrength("Emission Strength", Range(1,4)) = 1
11.         _Glossiness ("Smoothness", Range(0,1)) = 0.5
12.         _Metallic ("Metallic", Range(0,1)) = 0.0
13.  
14.     }
15.     SubShader
16.     {
17.         Tags { "RenderType"="Opaque" }
18.         LOD 200
19.  
20.         CGPROGRAM
21.         // Physically based Standard lighting model, and enable shadows on all light types
22.         #pragma surface surf Standard fullforwardshadows
23.  
24.         // Use shader model 3.0 target, to get nicer looking lighting
25.         #pragma target 3.0
26.  
27.         sampler2D _MainTex;
28.  
29.         struct Input
30.         {
31.             float2 uv_MainTex;
32.             float3 worldPos;
33.         };
34.  
35.         half _Glossiness;
36.         half _Metallic;
37.         half _ColorStrength;
38.  
39.         //Spherical Mask
40.         uniform half GLOBALmask_Radius;
41.         uniform half GLOBALmask_Softness;
42.         fixed4 GLOBALmask_Position[10];
43.  
44.         // #pragma instancing_options assumeuniformscaling
45.         UNITY_INSTANCING_BUFFER_START(Props)
46.             // put more per-instance properties here
47.         UNITY_INSTANCING_BUFFER_END(Props)
48.  
49.         void surf (Input IN, inout SurfaceOutputStandard o)
50.         {
51.             // Albedo comes from a texture tinted by color
52.             fixed4 c = tex2D (_MainTex, IN.uv_MainTex) * _Color;
53.             //Greyscale
54.             half grayscale = (c.r + c.g + c.b) * 0.333;
55.             fixed3 c_g = fixed3(grayscale,grayscale,grayscale);
56.  
57.             for (int i = 0; i < 10; i++)
58.             {
59.                 half d = distance(GLOBALmask_Position[1], IN.worldPos);
60.                 half sum = saturate((d - GLOBALmask_Radius) / -GLOBALmask_Softness);
61.                 fixed4 lerpColor = lerp(fixed4(c_g, 1), c * _ColorStrength, sum);
62.                 o.Albedo = lerpColor.rgb;
63.             }
64.             // Metallic and smoothness come from slider variables
65.             o.Metallic = _Metallic;
66.             o.Smoothness = _Glossiness;
67.             o.Alpha = c.a;
68.         }
69.         ENDCG
70.     }
71.     FallBack "Diffuse"
72. }

 

If you cant solve the issue some other way, i do have a package in the assetstore called TOZ Color Zones that does the exact thing you want.