TA3D

It would be great if someone could discribe how to add/edit shaders to 3dm models. I`d like to study it.

first you need to learn GLSL : http://www.opengl.org/documentation/glsl/
then just write your shader in the shader editor in 3DMEditor2 (just click the "shader" button in the surface properties window).

I`m during study process of this, thanks. Does shaders apply to the whole model or I can specify the part of it.

shaders apply to parts of the model (but to all the object it is linked to).