How to Multiply Alpha by a Float

Unity Engine
1

This is embarrassingly simple. Though this would be more straightforward in GLSL, sticking to Shaderlab syntax I’d like to take the _Trans property and multiply the alpha of the entire result by it, essentially having it adjust the transparency of the render. The code:

Shader "Custom/FlatTextured"{
	Properties {
		_MainTex("Base (RGB) Trans (A)", 2D)="white"{}
		_Color("Main Color",Color)=(1,1,1,1)
		_Trans("Transparency",Range(0,1))=1
	}
	SubShader {
		//queue and other settings here
		Pass {
			SetTexture [_MainTex]{
				constantColor[_Color]
				combine texture*constant
			}
		}
	}
}

Tried combine textureconstant,texture_Trans but that throws an error. How to get _Trans to now be recognized as a factor for the texture context’s combine?

2

Why don’t you just adjust the alpha channel of _Color?

3

with the * operator :slight_smile:

4

Genius.