Fading a basic shader

Using a customised version of a 'x-ray' shader from the excellent 'Makin Stuff Look Good' series

I need to simply fade or mask it out(would prefer to fade) thru code.

Can any shader gurus help?

Code (csharp):

1.  
2. Shader "XRay Shaders/Diffuse-XRay-Replaceable"
3. {
4.     Properties
5.     {
6.         _Color("Main Color", Color) = (1,1,1,1)
7.         _EdgeColor("XRay Edge Color", Color) = (0,0,0,0)
8.         _MainTex("Base (RGB)", 2D) = "white" {}
9.     }
10.  
11.     SubShader
12.     {
13.         Tags
14.         {
15.             "Queue" = "Geometry-1"
16.             "RenderType" = "Opaque"
17.             "XRay" = "ColoredOutline"
18.         }
19.         LOD 200
20.         //ADDED
21.         Stencil
22.     {
23.         Ref 1
24.         Comp Always
25.         Pass Replace
26.         //ZFail Keep
27.         ZFail Replace
28.     }
29.         //END CHANGE
30.  
31.         CGPROGRAM
32.         #pragma surface surf Lambert
33.  
34.         sampler2D _MainTex;
35.         fixed4 _Color;
36.  
37.         struct Input {
38.             float2 uv_MainTex;
39.         };
40.  
41.         void surf(Input IN, inout SurfaceOutput o)
42.         {
43.             fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
44.             o.Albedo = c.rgb;
45.             o.Alpha = c.a;
46.         }
47.         ENDCG
48.     }
49.    
50.     Fallback "Legacy Shaders/VertexLit"
51. }
52.  

 

Add the keyword alpha to the #pragma surface line then set the color value's alpha from script.

https://docs.unity3d.com/Manual/SL-SurfaceShaders.html
https://docs.unity3d.com/ScriptReference/Material-color.html

 

Awesome, thanks!