Mark,
Here is a Wiki that describes it pretty well. Class A surfaces - Wikipedia, the free encyclopedia
As I stated to Tom, it's not that Creo (Style) can't do some really good stuff. The fact is Body surface design is still developed from the full size clay model, which implies scan data, which implies the surfaces need to "tag" to the scan. Nothing in Creo has the ability to do this work easily or with the control required.
Scanners are getting better and the "noise" generated is getting less and less. But, I know of no car company 1. Using PTC products to do Class A work, and 2. relying on nothing but native surfaces from a Class A software (I.E. no stamping die is created directly from scan).
Al the best,
Dean
