Там вероятно я недописал во второй SetTexture
SetTexture [_MainTex] {combine texture * previous, previous}
т.е. вероятно правильно вот так
Shader "MaskedTexture"
{
Properties
{
_Color ("Main Color", Color) = (1,1,1,1)
_MainTex ("Base (RGB)", 2D) = "white" {}
_Mask ("Culling 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 [_Mask]
{
constantColor [_Color]
combine texture * constant DOUBLE
}
SetTexture [_MainTex] {combine texture * previous, previous}
}
}
}