info on class surfaces

[mastro.alle]

Bye to all,
I ask you an unexpert user question with the surfaces:
what it means to create a class surface?
from what I read quickly on the net it seems to have understood that it is continuity of tangences and curvatures.

I use a little self-taught gsd and what I ask myself is whether the individual surfaces created with sweep, multisection, etc. are class a or does it make sense to speak class only in the unions of contiguous surfaces?

Thank you.

 

[is3design]

the second that means it makes sense to talk about class to when the surfaces are joined otherwise beyond a certain value are no longer. It's a few cents. tangency and curvature are also important within certain parameters that I do not remember.

 

[Lucignolo]

the second that means it makes sense to talk about class to when the surfaces are joined otherwise beyond a certain value are no longer. It's a few cents. tangency and curvature are also important within certain parameters that I do not remember.

I would perhaps put the warp as a priority

 

[torniaccio]

with gsd it is possible to make continuous surfaces in tangence, but only with the appropriate modules you reach the so-called class of continuous in curvature. I think we already talked about it in another thread, so if you want to do a search here on the forum

 

[ETAOIN SHRDLU]

the curvature is the last of the problems; curvature does not mean class a. if you have two surfaces of m@rd@ you can put them in curvature as you like but will hardly be accepted as classes at

 

[Fulvio Romano]

According to my accurate studies on the subject (almost exclusively on the internet), there is no exact definition of class surface a.
with this term they define "beauty" surfaces and that they do not have un manipulatable behaviors.
so if you are able to create a surface (or more surfaces in continuity) "nice" to pleasure, and you are able to control it at every point, without leaving anything to chance, this can be defined by class to

 

[cacciatorino]

in support of what is said makes Roman fulvio:
http://en.wikipedia.org/wiki/class_a_surfaceshttp://www.design-engine.com/stories/classa_surface/classa.htm

 

[torniaccio]

hunter always generous and punctual! It's a pleasure to read you again.

Bye!

 

[nino66]

working in the automotive field, the class surfaces are used for the ultimate definition of the style model from here then create the definitive details (the ones from which you then make the molds for the production in series). before arriving at these, also because often require many hours of work having to be very careful, you go through other classes b or c accepting "errors" and/or slightly higher distances to do because they are those obtained directly from the commands (sweep, etc... ) without any other setup. These are such as to allow early feasibility studies or other uses.

 

[kristian976]

According to my accurate studies on the subject (almost exclusively on the internet), there is no exact definition of class surface a.
with this term they define "beauty" surfaces and that they do not have un manipulatable behaviors.
so if you are able to create a surface (or more surfaces in continuity) "nice" to pleasure, and you are able to control it at every point, without leaving anything to chance, this can be defined by class to

I share....
I have read a lot about this, class surfaces do not exist, maybe there are refrigerators and washing machines, it is just a way of saying to define a job well done or otherwise a job of m...a!

Good job.

 

[barlafus]

according to my experience, I confirm a lot of what has been written so far by everyone and I add something:class a is a non-unique arbitrary definition, i.e. if you ask ten people you get ten similar but not equal answers; For example class a per fiat is not necessarily equal to class a per bmw or to others.
the defined surfaces must be "bézier" (see and explore wikipedia)
requires quality requirements of the continuity between the surfaces within certain tolerances (values that are usually slightly lower than those of processing).
not only have to be satisfied the continuity but also (and here comes the beautiful as well as the subjectivity) the "ordinated" provision of the control points.
normal fittings should not exist but only style fittings (at least for the parts in sight).
g3 continuity is desirable in some areas of the model, however at the discretion of the designer or the client.
a good profiler takes many days to complete a model; a "local" change involves a "global" change, i.e. sometimes (not always) it is not enough to move a point of control of a surface but also to change those of the nearby surfaces. for (also) this reason it is advisable to place the ctrl points logically and ordered.
As the modeling time is long, all style considerations (ideas, variants, adjustments etc.) and design feasibility are modeled in class b, c, and who more has it more. only after these activities begins the extenuating modeling in class definition a.

If you've made a good model, zebra lines will definitely run well.

 

[Fulvio Romano]

a "local" change involves a "global" change, i.e. sometimes (not always) it is not enough to move a point of control of a surface but also to change those of the nearby surfaces.

Well, well, then it's not just me that when they ask me "change here, come on, it's a little change, just here!" I start sweating cold.
Go tell him that it's about disassembling much of the model and doing it again!

 

[nino66]

I have read a lot about this, class surfaces do not exist,

There you are! but you will hardly find detailed news on the network, as, definitions and specifications (in practice these only the definition of tolerance of space and distance between the admissible surfaces, definition of minimum beam objects, etc.. but above all what is not admissible) are given directly by the clients who have internal regulations in this area (e.g. fiat, mercedes, bmw, etc...). to have these regulations you need to have access to business intranet sites or provide you with the job specification .... If not then you regret it!!!:mixed:
of course every company has its own and can be assimilated, they are actually very similar, and therefore when you ask for a model with surfaces in class to (in practice extra finite surfaces, well distributed and without errors it holes even if microscopic!!!) who does it in business knows what it is about... and therefore what this work means and therefore the time necessary to do so, since rarely the "automatic" commands (raggi or quan' others) always perform this task.