Making a character appear through 1 layer of objects but not 2 or more

Hi,

I am working on a project using Kinect and Zigfu. I have a Kinect feed object (a flat screen between the main camera and the rest of the scene) through which I want my character to appear. This works pretty well, I have written the following shader to achieve this:

Code (CSharp):

1. Shader "Custom/FriendShader" {
2.     Properties {
3.         _Color ("Main Color", Color) = (1,1,1,1)
4.         _MainTex ("Base (RGB)", 2D) = "white" {}
5.     }
6.     Category {
7.         SubShader {
8.        
9.             //sampler2D _MainTex;
10.            
11.             Tags { "Queue"="Overlay+1" }
12.                                            
13.              Pass
14.             {
15.                 ZTest Greater
16.                 Lighting Off
17.                 SetTexture [_MainTex] {combine texture}
18.             }
19.                                            
20.             Pass
21.             {
22.                 ZTest Less
23.                 SetTexture [_MainTex] {combine texture}
24.             }
25.            
26.             CGPROGRAM
27.             #pragma surface surf Lambert
28.  
29.             sampler2D _MainTex;
30.             fixed4 _Color;
31.  
32.             struct Input {
33.                 float2 uv_MainTex;
34.             };
35.  
36.             void surf (Input IN, inout SurfaceOutput o) {
37.                 fixed4 c = tex2D(_MainTex, IN.uv_MainTex) * _Color;
38.                 o.Albedo = c.rgb;
39.                 o.Alpha = c.a;
40.             }
41.             ENDCG
42.         }
43.     }
44.     FallBack "VertexLit"
45. }
46.  

However, if there is an object between this Kinect screen and the character, I want that part of the character to be occluded. Right now, the character appears through everything regardless of the number of objects standing between it and the camera. Is there a way for the character to only be rendered with 1 or less objects being between it and the camera?

Also I think the CPROGRAM part of my shader is not doing anything. I included that as I wanted phong/specular shading applied to my model but right now it seems as though I am only getting diffuse. Any help with this would also be greatly appreciated.

I'll answer any questions and provide more info if that makes it any easier.

 

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