I think this falls under the heading of it it were easy, someone would have done it by now. So you have FBX, collada doing other aspects but not shaders. AFAIK, you may not even be able to take e.g. VRay shaders between Max and C4D. You get best effort approximations e.g. Poser to Lux. Even if the technical problems were solved, what may be in users interest not necessarily seen that way by companies.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken