So, no one answered this in previous thread, thats why I've decided to ask it here...
I'm using modified flashlight made by XdiVo (you can find it on Wiki), and I've assigned materials to blocks and models.
And now, I'm trying to place decals on that blocks and models, but I faced problem that they aren't placed right (or may be just not visible).
I've set projection material on decals as well, thought that might help, but no luck, tried other materials as well (mtl_model etc)...
When I'm close to the walls, then I can place decals on them without any problems, but when I'm far from them, it's tricky (I get them placed very seldom)...
When I shoot to the floor, doesn't matter far or near, then I get properly placed decals... I faced this problem with both A8 and A7.
I thought the trick was to set same material to decals, but I was wrong I guess... Could you make this clear? How to place decals on models and blocks with material?

It is possible that decals don't work with a certain shader. For instance, when the shader uses a special vertex transformation with a different z depth, decals might become invisible.

In such a case, the decal needs a shader that takes the surface shader in consideration. For this you need to know what the surface shader does and how it affects decals. It depends on the shader - there is no schematic or automatic solution for this.

Shader transforms the uv matrix to achieve the texture projection, but not the vertex itself (no shape deformation happened in the shader).
Plus from what I read from manual about decal, the shader shouldn't mess with texture1, which the shader does unfortunately.

So, has decal nothing to do with texture1? Or with UV matrix?!

No. When the decal has its own material, so that it does not use the surface material, it normally won't matter what the surface shader does. The exception is the above mentioned vertex transformation.

Ohh... So what should be the fix for this? What should I do?

Well, if your decal does not work with your surface material, just give it another material.

Look in the example in the manual - it does exactly that. However if your decal won't work even with a normal material, you then need to look into what your surface shader does, find the reason of the problem, and fix it - for instance by writing a special shader for the decal.