Hello all,

     I have a two part question.  First I am looking for the classes of surfaces and what makes them different from each other.  Pretty much a broad definition of each surface class and there uses.  The other question is that I am having trouble understanding what is the difference between a surface model and a solid model.  The main problem I think in understanding this concept is the creation process for both and what I can and cant do when creating.  Thanks in advance for the help.

Charlie