Is it necessary to learn 3d?

[JonHop]

Sculptris is a free 3d software, I've played around with it a little (nothing overly long) and it seems very user friendly and like it wouldn't take too much time to learn to use well as it is tailored toward artists who want to be able to create in 3D easily. http://pixologic.com/sculptris/ Try it out, I think you'll like it and it will benefit you in your concept art career.