Projector problems, texture always fits to size what it projects on?

So I am just trying to set up a simple selection graphic below a unit which is as green glowing ring. However when the projector touches the plane that it should be projecting on to, it always without fail stretches to fit the object its projecting on to. I did the 3dplatformer tutorial and even attempted to use the blob shadow projector from it, but I get the same result.

Here is a screenshot :

As you can see the green ring stretches to fit the plane even though you can see the projectors field of view should have it projecting to only a small square below the character. Also moving the projector or even rotating it has no effect, if any part of the projection touches the object it should be projecting on to I get this result. I have tested this on multiple meshes and unfortunately get the same result each time so I must be missing an important step in this process. Any ideas?

 

Ok so I figured out that using normal shaders apparently does not work with projectors as you would expect they would. (This really should be documented somewhere as its not easily apparent). I found the source for a transparent texture shader on google then combined what I needed from the blob shadow shader in the test project and it works:

Code (csharp):

1. Shader "Transparent Texture" {
2.    
3. Properties {
4.     _MainTex ("Texture (A = Transparency)", 2D) = "" {
5.         TexGen ObjectLinear
6.     }
7. }
8.  
9. SubShader {
10.     Tags {Queue = Transparent}
11.     ZWrite Off
12.     Blend SrcAlpha OneMinusSrcAlpha
13.     Pass {
14.         SetTexture[_MainTex] {
15.             Matrix [_Projector]
16.         }
17.        
18.     }
19. }
20.  
21. }

I know nothing about shaders at the moment so I really have no idea why this is required to make the projector function as expected

 

Yeah, that's true.
I have no idea why Projector has all these settings if they don't work.
The size of the projected texture is just a size of a target object.
So if you use Projector on the terrain the size of texture will be the size of the whole terrain.
Extremely stupid and extremely sad that in 2021 this is still not fixed.