I personally use 3dsmax for modeling and rendering, so I will say that yes, it can be used as the sole package to do all the things you are currently doing between two parties. However, I would say that the implication that only 3dsmax is capable of realistic results in that situation is untrue. Realistic results in furniture modeling and rendering can be done just as well in many different packages.

The pipeline you currently employ does seem to have one too many steps for what you require, but if this makes financial sense to you, and the results are what you want, then it's fine. However, if you would be reducing cost or expense by employing just the one party to do all of the needed work, and the results were just as good or better, then I would suggest you go that route. Only you know if it's financially sound either way, and that's the approach to take.

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