Projector on transparent objects

I´m trying to make all objects in a scene turn white. I´m using a projector and it seems to work just like a want it to, Except for transparent objects. Instead of turn white they become gray. see picture.



Does anybody know the trick to make it work ?

The shader I use for my projector

Code (csharp):

1.  
2. Shader "Myshaders/Projector_noAlpha" {
3.     Properties {
4.         _Color ("Main Color", Color) = (1,1,1,1)  
5.         _MainTex ("Cookie", 2D) = "gray" { TexGen ObjectLinear }
6.     }
7.  
8.     Category {
9.         Lighting Off
10.         Blend DstColor Zero
11.         Fog { Color (0, 0, 0) }
12.  
13.         Subshader {
14.             Pass {
15.                 ZWrite On
16.                 ZTest Equal
17.                 AlphaTest Greater 0
18.                 Color [_Color]
19.  
20.                 SetTexture [_MainTex] {
21.                     constantColor [_Color] Combine constant * texture, constant
22.                     Matrix [_Projector]
23.                 }
24.             }
25.             Pass {
26.                 Cull Off
27.                 Alphatest Greater 0
28.                 Blend SrcAlpha OneMinusSrcAlpha
29.                 Color [_Color]
30.  
31.                 SetTexture [_MainTex] {
32.                     Combine previous * texture DOUBLE
33.                     Matrix [_Projector]
34.                 }
35.             }
36.         }
37.     }
38. }
39.  

/ bjerre

 

Hi

I'm unburying (no sure if this word exists!) this post because I went into almost the same need, and I don't understand why that can't work.
Actually I have a scene with a camera that render what it see into a render texture (also with depth map), and I want to project this on a plane, but I want the parts where the depth map is black to be transparent on the projected plane.
My plane has a custom transparent shader, and when the plane has a part inside the frustum of the projector, it turns opaque.

[EDIT]
Specifically what we want to know is if the projector pass is rendered before or after the original material, and if it's possible to project transparency or at least a cutout

@Aras, I trust you when you say that this is not possible, but what I want to understand is why

Thanks for your help !

 

Why do spotlight cookies display properly on sprites then?

 

Would like to be able to project onto plane and the transparency of the projected image is cutout on the plane. Has anyone made progress here? Is it impossible?