Shader newbie question: How to position a Mask

Unity Engine
1

Hi there. First of all I am new to shader development.

Currently I am working on a project and being a complete shader newbie I have a question about it. The following picture shows what i want to achieve.

The grey/black area’s should be transparant. I am using the following shader for it.

Shader "MaskedTexture"
{
   
   Properties
   {
   	//_Color ("Color", Color) 	= (1,1,1,1)
      _MainTex	("Main", 2D) 	= "white" {}
      _Image	("Mask", 2D) 	= "white" {}
	  _Cutoff ("Alpha cutoff", Range (0,1)) = 0.1
   }
   
   SubShader
   {
   
      Tags {"Queue"="Transparent"}
      Lighting Off
      ZWrite Off
	  Blend SrcAlpha OneMinusSrcAlpha
	  AlphaTest GEqual [_Cutoff]
      
     Pass 
     { 
	SetTexture [_Image] 
	SetTexture [_MainTex] {combine texture, texture * previous} 
     }
  }
}

My question is, is it possible to select the position where the Mask is going to be placed?

2

Use texture offset, alter the UVs, or use Matrix command on them.

3

Also remember to set the texture to “Clamp” so that it doesn’t tile all over your mesh.

4

@Jessy… the tutorials are awesome… thanks…

5

@Jessy, Thanks the texture offset part helped :slight_smile: