[CLOSED] Shadow & stealth. Shadows hide player from AI.

Greetings, ladies and gentle! I apologize in advance for a long post!

I wanted to make a good stealth system for my extensive tech demo. I want something different than normal stealth games nowadays. I want something like the old Theif game or old splintercell stealth, where shadows would actually conseal you. Its a cool idea. But from what I've heard about unity, its not possible to do?
So first question: Is it even possible?

I did some research and found this forum post: http://answers.unity3d.com/questions/24662/detect-lightshadow-falling-on-object.html I tried to do what it says about rendertextures, but I dont know how.

I set up a 32x32 rendertexture from my AI's camera, rendering only the player. But I am not able to access it from my script it seems(, not sure). I simply added a grayscale image effect so that I only need to check the white/black value of the pixels, but I dont know how to do that either. Also when I set the AI cam to player only, the lights that shine on it goes trough walls, is this fixable?

TLDR:
Is it possible to check how lit up an object is using rendertextures and checking the pixels colourvalues?
How do I access a rendertexture from a script properly?
How do I make a rendertexture into a normal texture2D?
How can one check the brighness or white/black colour value of a rendertexture?
How do I keep the shadows from other layers when a camera only renders the player?
Is there a better way to do all this?

 

I don't know if it is possible to do it with light/shadow detection, or the by checking colorvalues. But, as you generally want to bake the lighting anyway, it is also a possibility to just place triggers in shadow spots that set a bool whether you are hidden or not. That way, when an enemy "detects" you, he can just check if he should ignore you or not.

Might be a bit "hacky", but something to keep in mind if there are no better options.

 

Placing triggers in the shadows would work great, sure. But I want to be able to deactivate certain lights in certain ways, and it would just be a pain in the arse to place triggers in the right way. This isnt something that must be done, Im just making a neat tech demo as a hobby, not a full game. Its more as a learning experience.


I found this: http://answers.unity3d.com/questions/276890/converting-a-rendertexture-to-a-texture2d-for-use.html
I have not tried this yet, but I will soon. If this works then the next step is to check all the pixels in the texture. Can one use texture2D.getPixels for this? I dont really know how getPixel works, but hopefully someone can elaborate?

Quick update:
I have managed to convert a rendertexture to a texture2D. Now I only need to check all the pixels for how white they are. Any help?

 

Well, I managed to do this on my own... Sorry for a waste of time people.

 

It's been a few years, but what route did you end up taking?
I'm working on a similar game and have been looking at different ways to detect lighting.