Question Shader for Slider Effect on World-Space Objects

Hi everyone,

I am kind of new in writing shaders and I am trying to achieve a slider effect on my world-space objects. So, to achieve this, at the end of the shader I am checking whether the alpha value of a given reference texture is above the fillrate variable. If it is, consequently, setting the alpha value to zero.

As a result, I have achieved what I wanted as in attached gif, but I am not sure, whether this is the most performant and best way to do it.



Is there any other way to achieve similar behaviour, without using if statements? Or is this a valid and proper approach to get this kind of slider effect?

Code (CSharp):

1. Shader "Ocean Surface Alpha"
2. {
3.     Properties
4.     {
5.         _MainTex ("Texture", 2D) = "white" {}
6.         _FillRateTex("Texture", 2D) = "white" {}
7.         _FillRate("Fill Rate", Range(0.0, 1.0)) = 1.0
8.     }
9.  
10.     SubShader
11.     {
12.         Tags { "RenderType"="Transparent" "Queue"="Transparent" }
13.  
14.         Pass
15.         {
16.             Blend [_BlendModeSrc] [_BlendModeTgt]
17.  
18.             ZWrite Off
19.            
20.             CGPROGRAM
21.             #pragma vertex Vert
22.             #pragma fragment Frag
23.             #pragma multi_compile_fog
24.  
25.             #include "UnityCG.cginc"
26.  
27.             sampler2D _MainTex;
28.             sampler2D _FillRateTex;
29.             half _Alpha;
30.             half _FillRate;
31.            
32.             //
33.             // Shader doing projection stuff
34.             //
35.             {
36.                 col.a *= _Alpha;
37.                 if (tex2D(_FillRateTex, input.uv).a > _FillRate)
38.                 {
39.                     col.a = 0;
40.                 }
41.  
42.                 return col;
43.             }
44.             ENDCG
45.         }

 

Yes, but there's no reason to use them as what you're doing is already the fastest option.