I couldn’t achieve class-A everywhere. Like the curvy area that goes in, on the car’s side.
I learned most techniques from Alias’ help videos found in Autodesk site. And then I applied those techniques in Rhino. I think those videos show almost everything to build class-A surface. Theories included.
Surfaces built from single span curves generally creates class-A. But I found it was very difficult to create long curvy single span curve. So here’s what I did. Build two surfaces that are fairly square or rectangular in shape then trim excess areas and create blend surface between them. Sometime had to create more than one blend surface. between them. The mirror was created with curve networks. The top vent thingy is actually a rectangular surface, trimmed to the final shape.
Some times I went for more traditional ways of checking the curvature of curves that has been projected, to trim a surface. Like the carbon fiber area that extends from the side of the windows. I held the model in an angle rather than look at it perpendicularly almost like what a carpenter does to see if the chiseled area has any bumps or not. The I tweak the curve with cage numerous time until I achieve the final shape.
Anyway check those Alias tutorial videos found in Autodesk website if you are interested.
I mainly do polygonal models which are compatible with movies or games. Nurbs modeling is very new to me and I am no expert. Here I am sharing a few things that I picked in the last few months creating this model.