Shader for Projectors

I'm trying to get projectors to work , but I think the shader I use is bad... Right now I use one of the stock unity shaders

I've done some internet searching and it seems that people have to come up with their own shaders to get these projectors working ? Or is there a way to get them to work using the standard unity stuff ?

If not , any tips on how to start coding a shader ?

 

Kinda lost here , the documentation on this is vague as can get, and most of the shaders people from this forum wrote seem to be horribly outdated... Kinda weird that they standard include a projected but not a shader to work with it... what's the point if you can't get the damn thing to work without the shader...

 

So I did some searching and found that there acutally are shaders , but you have to import them first... sheez what a hassle , it's all good now