Edge styling / G2 surfacing

[SW]

As I understand it, a few years ago the fashion in the automotive market changed from an emphasis on soft rounded shapes to pronounced edges, such as that shown on the image below. I'm interested in the construction of theses surfaces within a CAD system.

from http://www.pistonheads.com/pics/news/17644/J001front-L.JPG

Is there a defined break in the change of curvature on these surfaces,
as with a standard rounded edge, or is the change of curvature actually
continuous and just very rapid across the rounded edge?

Also, this image does not illustrate it well, but there is often subtle
change from defined edge between the surfaces, blending to to smooth
seamless transition between surfaces. How can this be implemented and
managed effectively? I've experimented with this sort of thing with
varying degrees of success, but would be interested to hear of the
standard principles. Pro/E examples would be all the better.

Cheers,

Sam

 

[Jacoolo]

just to inform You if the link was missed before



here is the link(introduced some time ago at "some surface behaviour...")

link

 

[design-engine]

anyone look at the first victory motorcycle that was released back in the 90's... It looked like it only used Pro/E rounds and extrusions. To me it's all technique. Now they must have hired some surfacing contractors because things are looking better.
Edited by: design-engine

 

[SW]

Jacek, A belated thanks. The information in the AliasDesign ink is what I was looking for.

Sam

 

[Jacoolo]

welcome SW

there is much more valuable info on cgcars, which unfortunately is shut down now.

Simply put car modeling nurbs(nurbs is the most important word here) in google

gonna find a lot of stuff which can be then usefull considering Pro/E