UV Light Reveal Shader

Hi guys.

So, I'm trying to reveal a texture on a plane only if a UV flashlight is shining upon it.

I stumbled upon the following shader:

Code (CSharp):

1. Shader "Lighting Only" {
2.     Properties {
3.         _Color ("Main Color", Color) = (1,1,1,1)
4.         _MainTex ("Base (RGB)", 2D) = "white" {}
5.     }
6.  
7.     SubShader {
8.         Blend SrcAlpha One
9.         ZWrite Off
10.         Tags {Queue = Transparent}
11.         ColorMask RGB
12.         // Vertex lights
13.         Pass {
14.             Tags {"LightMode" = "Vertex"}
15.             Lighting On
16.             Material {
17.                 Diffuse [_Color]
18.             }
19.             SetTexture [_MainTex] {
20.                 constantColor [_Color]
21.                 Combine texture * primary DOUBLE, texture * constant
22.             }
23.         }
24.     }
25.  
26.     Fallback "VertexLit", 2
27.  
28. }

This works for spotlights shining a white light, but it does not work when I turn the flashlight to a purple color.

I admit, I do not have any experience coding shaders, but I don't see any handles to tweak a setting related to my issue.

Would any of you know of a quick fix for this, or would it require significant work, keeping my inexperience in mind?

Thanks, and happy holidays! =)

 

Hey, did you fixed it?

 

Hello

UV light reveal shader can be made in amplify editor.

the idea is you have a “UV Filtered Color” that is the color you set your light and when shine on it gets revealed. you should also consider

Threshold Reveal Color
this is a float used to make fine adjustments for the intensity from your additional light

Threshold Reveal Color Temp
this is one of the trickier parts that in Unity is not well documented. Lights have a Temperature value that runs in a different way however still contributes to the light color. This Light Temperature also currently does not get included within Light layers. One way to work around this is to filter thru blackbody http://www.vendian.org/mncharity/dir3/blackbody/
the radiation ranges from 7800-40000 should let you deal with filtering white light more easy.

If you’re working in URP, also consider Main Light Influence completely off. Note this is not necessary in BIRP built in pipelines.

 

Note amplify also has some simple shader examples for UV revel in built-in pipeline to help you get started.

if you’re looking to skip the learning process and just wish to have a full working set my asset called “DE Environment” has a full set of them included also in URP 10x 12x and 14x forward+.. all shader functions are included

https://assetstore.unity.com/packages/vfx/shaders/de-environment-183775#reviews