How many shapers out there know what that is?
Here’s a link if you are interested…
http://www.cs.mtu.edu/~shene/COURSES/cs3621/NOTES/curves/continuity.html
In my previous life as a water molecule, I found
that running along a C2 surface was much easier.
-Hein
This is a much better explanation
and relates mostly to rocker and
outline curves.
http://www.coe.org/newsnet/may04/knowledge.cfm
-Hein
I may be wrong, but doesn’t the “coe” discussion represent a subset of the “mtu” discussion? (…and hence one might expect would be easier to follow)
You are right, MTB
I’m familiar with C2 continuity from my CAD background.
The “mtu” discussion is a bit heavy so I kept looking
for a better explanation after I saw my post got some
views but no replies. Too brainy for Monday morning I
presume.
I thought the “coe” discussion would help.
Thanks for noticing.
-Hein
Since you’re familiar with C2 from CAD, you might also realize you can have to surfaces that are extremely close but one of them has a discontinuity.
the way shaping and glassing works could very easily render the design effort to satisfy C2 continuity useless.
not to mention that sometimes you need a discontinuity (to release water flow).
I’m and Industrial designer, and I’ve played with C2 surfaces for a long time, I really don’t think it’s worth the effort here.
d
noboby cares about C2?
that’s a shame,
since water molecules do.
-Hein
What about ASP3000?
Does it have the ability to maintain C2?
-Hein
Hein, how about a sixer of Budweiser to take out the night watchman, then you and me pull a “splash” mold off this surface?
the 100 incher at Mt. Wilson Observatory…
Sleep tight.
What about ASP3000?
Does it have the ability to maintain C2?
-Hein
C2 is not just about surface finish smoothness.
Good C2 means that the change in curvature
is smooth and gradual as you move along a curve.
Here’s an example of two virtually identical
rocker curves for skim board:
Notice how the curvature in the top image undulates
and in the second computer optimized rocker it’s nice
and smooth.
Now if I were a water molecule, I would find it much
easier to flow along the second rocker.
-Hein
High end computer aided surfacing can make a difference.
Shape3D has this. Check out the demo:
What about ASP3000?
Does it have the ability to maintain C2?
-Hein
Sorry My post above didn’t work. Trouble with this editor and linux.
The main problem with C2 is that changes aren’t local. With C0 (when
the cont box is not checked) moving the yellow point only affects one
part of the curve, but with G1 (which is what we get by checking the
cont box and is weaker than C1) moving the yellow affects the curves
on both sides of the blue, but only those. But with C2 any change
affects all of the curves which is not really acceptable from a
surfboard design point of view. Using a different type of mathematics,
it is possible to get both local behavior and C2 but it has a
different kind of points: unlike our blue points, these apex points
are not on the curve and of course harder to get used to so we
abandoned that. Designing surfboards with this setup seemed to be
unintuitive for our testers.
Anyway here’s what I meant to post.