Invert Color Shader (without see-through)

Hello Community!

I'm wondering how it's possible to achieve a Shader that inverts an objects color that it touches.
Something like in the following video

I already found this shader:
http://forum.unity3d.com/threads/invert-colors-shader.205244/

the problem with this one is, that the object (e.g. an Cube) where the shader is applied to acts like a mirror and inverts everything you look at. I want the object with the shader to be invisible and is just inverting the color of the objects thats inside it.

My Intention is to get a similar result like in the image:
http://www.androidshock.com/wp-content/uploads/2013/10/Paper-Sorcerer-1.jpg

regards
Soulart

 

You need to make a shader which has a Blend function of something like GL_ONE_MINUS_DST_COLOR, GL_ZERO ... which will multiply the existing backbuffer's color values by whatever is in your source image... if your source image is white, it'll just flip the colors.

 

In Unity syntax:

Code (csharp):

1.  
2. Blend OneMinusDstColor Zero
3.  

The output of the shader needs to be pure white for a complete inversion.

 

Thanks for the help

I tried jvo3dc's Method:

Code (CSharp):

1. Shader "custom/Invert" {
2.     Properties
3.         {
4.             _Color ("Tint Color", Color) = (1,1,1,1)
5.         }
6.      
7.         SubShader
8.         {
9.             Tags { "Queue"="Transparent" }
10.    
11.             Pass
12.             {
13.                ZWrite On
14.                ColorMask 0
15.             }
16.             Pass
17.             {
18.                 Blend OneMinusDstColor Zero
19.  
20.             }
21.          
22.          }
23. }

The Shader doesnt work. To be honest I dont habe any knowledge in programming and shader.

 

This part is breaking things:

Code (csharp):

1.  
2. ColorMask 0
3.  

That actually disables any change to the color buffer. Also, you probably want the ZWrite to be Off.