CAD v Modeling
-
I read somewhere that "SketchUp is not CAD".
SU is the first 3D program I have ever used (hell it's the only 3D program I have used) what is the difference between CAD programs and Modeling programs.
There is obviosly some similiarities but what do CAD program provide that modeling programs do not?
-
as far as the acronym goes, sketchup is CAD.
where did you read that it wasn't?
Pav
-
CAD = Computer assisted drafting to some and drawing to others.
-
@pav_3j said:
where did you read that it wasn't?
I can't remember and didn't care (still don't) SU does what I want to do but I got curious.
@solo said:
CAD = Computer assisted drafting to some and drawing to others.
... and design to others. I always thought it was design, if you use drafting or drawing then Photoshop could be considered CAD.
-
yeah i've always regarded the "D" as design.
good on you for not caring though, we get told not to use sketchup at uni, apparently it isn't "refined" or "accurate" enough (to name but a few slights my tutors have made on it)
one tutor, in the middle of a critique of my work, said that although my model was excellent, if i used sketchup again he'd mark me down. in his words "it's just not as sophisticated as, say a maya model would be"
my response: "the model is as sophisticated as the person moving the mouse"
needless to say i have used sketchcup ever since.
this is just one example of industry "snobbery" and in my eyes this CAD thing is the same kind of thing.
rant over!
interesting topic to bring up hazza, thank you!
Pav
-
I think CAD originally was referred to as 'Computer aided design' and that it later on got the connotation of being about 'drafting ' only. (Although Wikipedia says the exact opposite)
The term 'modeling' refers more to things that aren't that related to making a 'production ready' thing.
For instance, I would categorise Solidworks as CAD , as it is meant to engineer and make production ready design (moulds, etc...), while Rhino is more a 'modeler', a design intrument that can be very accurate but in a lot of cases is not meant for production ready drafting.
In the architecture field, Revit would be 'CAD' to me, while SU would be referred to as being a 'modeler' for the same reason .
-
@pav_3j said:
one tutor, in the middle of a critique of my work, said that although my model was excellent, if i used sketchup again he'd mark me down. in his words "it's just not as sophisticated as, say a maya model would be"
Then they are an idiot, that's like saying "excellent painting but if you didn't use XYZ brand of paint brush then I will take marks off you"
-
@Pav,
Next time just say you made your product using 'Gehry Technology
' and see how they 'll react 
-
As an Architect, if find that Su's strength is in designing from the outside in, and in the facilitation of presentations. Currrently it is of limited value in the process of diagraming that results in floor plans. Su also has limited value leading to the documentation of construction documents.
I often use a pencil to initiate diagrams, rough floor plans, and model building forms. These napkin sketches continue to be developed on a computer where plans, and the building are modeled in greater detail. The vector model is then ported to Su to facilitate visulization and presentation. Revisions to the design that are suggested by working in Su are ultimately modeled by the initial CADD program, then ported as a replacement component into Su. The reason to make the changes in this manner is to preserve the integrity of the CADD database so that it can be used to create the production drawings. To date, Su can not port drawing entities to CADD programs in a manner that better facilitates production documentation by these tools, and despite the advancements with layout, remains unsuitable as a primary production drawing tool.
Architecture is still after all, about buildings, not about computer aided tools. I can not speak as to its value in other industries.
-
Well,I am not an architect so I cannot fully talk about what drafting tool (dimensioning, hatching, annotating whatnot) architects eventually use in CAD softwares but back to the original question; I have heard/read several times from GSU developers say "SU is not a CAD software" and what I suspect is that they actually mean these things. The final output type that is still notoriously and conservatively demanded when it comes to 2D, printed output for standard architectural documentation.
LO could get closer to a final CAD like output once some tools like native dimensioning and such were added.
Talking about SU not being "accurate" enough is simply ridiculous and only shows the mere ignorance and haughty snobbery of a person who - sitting in the cushy chair of a tutor - should rather be open minded enough to encourage his students to be alike and try to explore (and eventually be able to compare) different tools in their workflow.
We rather have problems with imported CAD drawing being sufficiently "accurate" in CAD but painfully inaccurate and sloppy for SU than vice versa.
-
Well as mentioned above, I always understood CAD to refer to computer assisted drafting, which as Csaba mentioned was primarily a 2D result, until recently when the traditional work methods evolved into this almost transitional way of working we have now. The moment we can use a 3D representation on-site will be the end of 2D CAD and that day is coming soon, I can imagine a few framers sticking to the pulp version calling themselves 'old school' however.
As for the anti SU snobbery, a student this summer (I did a summer camp class to some middle school kids) compared SU to an AK47 as he heard me reference "3D for everyone" and he remembered a similar phrase used in Command and Conquer 'Generals and Zero Hour' game where the GLA get a rifle upgrade and exclaim "AK47's for everyone". Come to think of it that's an amazing anology as SU is the outcast as was the AK47's evil Commie reputation during the Cold war, yet today we know that it's the most succesful rifle ever made that was available to almost anyone for pittance, was customisable and robust, and still manufactured today on demand. Sure it may not be as accurate and have a range like the swanky, over priced M16, but it gets the job done well nevertheless.
(let's not go off topic now please this is just a comparison not a rifle debate)
-
hmmm good analogy, if you drag an AK 47 through the mud it is still supposed to fire.......
Anyway back over at the topic, you can use SU in a CAD like way if you are really organised with your modelling and make good use of sections and layers.
When 3d rapid fabrication gets cheaper and goes desktop perhaps the product design industry will be one of the first to start to totally phase out 2d CAD detailing.
-
Hi all
i work as an interior designer and mainly we focus on cabinet design
but we use sketchup for all owe modelingwe take cad floor plans and extrude all walls put in ceilings & bulkheads then add any interior objects like cabinets plumbing fixtuers ect...
once this has been done and approved or changes made we do sections and export these to autocad the add dimensions & text and lay them out on pages so the cad drawings we create are only as accurate as the sketchup modelbut i have always thought CAD was computer aided design
so theres my thoughts
ps sorry bout the spelling
-
When the SketchUp developers have repeatedly said "SketchUp is not CAD" it was always in the context that SketchUp is not intended to be a replacement for AutoCad (and the like). They have also stated that it never will be as they have no intention of ever taking its development in that direction.
They do intend for it to be a good team player so it can be used as part of a workflow that includes production tools like AutoCad, Revit, etc.
With regards to the architectural school critic saying SketchUp isn't sophisticated enough, he or she obviously hasn't seen what SU is capable of. If the students using SU are making crude models while those using other software are achieving better results then the critics observation is somewhat understandable. Rather than switch to another modeller I'd suggest stepping up to the challenge of producing SketchUp models that are more 'impressive'. (What that means is hard to say). All modeling software are just tools and its up to us on how we use them. SketchUp can be used effectively or not-so-effectively in a basic way or you could take it to the extreme like Tim Danaher does. If the critic is approachable (I know some aren't) perhaps you could have a discussion about modellers and what was meant. It sounds like the remark was a reaction to what was being presented rather than a well-considered arguement. Show the critic work like Tim does and I'm sure there will be a greater appreciation of SketchUp as a tool. The problem is you might then be expected to achieve far more in your sketchup modelling!
Regards, Ross
-
Do I detect some resentment towards Architects? Modeling, and visualization only account for a portion of the schematic design process. This phase represents about 10-15% of the effort that goes into the Architect's effort to build a building. If 3D could replace 2D drawings in construction documents, it would have been done a long time ago. Architects have the ability to draw in 3D (perspective and axonometric views) without computers, and are not in love with the effort it takes to ornithologically project a building's views. When 3D illustrations aid in the construction of a building, it is included as part of the construction documents, along with photographs, written building specifications, and instructions as to other contract requirements that make up the set of documents. Printed paper will someday be replaced as an inexpensive, compact means to distribute a indexed form of interrelated construction instruction, probably because we will have destroyed the source of producing it.
-
@honoluludesktop said:
Do I detect some resentment towards Architects?
Where are you detecting resentment? In this thread? -
I'm a UK based teacher and have been searching for almost a decade for some effective way of introducing CAD to our students. Over the years we have tried numerous CAD packages from pro-desktop (supposedly designed for school use), through Autocad and onto Solidworks (hey we even dabbled in Maya for a few terms ).
In every case it was the learning curve that defeated me/us.While the older students could persevere, practice and end up with a reasonable skills set. The younger ones couldn't even get started and became frustrated and bored with the software.
Then along came Sketchup. I'm afraid I must admit that on my first encounter I was in the same camp as your lecturer friend . Yes its all very good, but it is a bit limited and it is not proper CAD'. So I put it away along with a pile of other software and set about the Solidworks video tutorials - yet again.
This summer while mooching around the net, two sites opened my eyes - Podium and this forum. I suddenly realised that my initial impressions of sketchup were mistaken, that that simple interface belies a very sophisticated and capable CAD package. What is more I soon realised that if I a science based teacher with no formal art/design training and limited graphical skills could produce some reasonable models within a few days. Then I could teach all of my students to do so.
Since then, unfortunately I've become a bit of a Sketchup evangelist and I'm sure the art/design staff and students are becoming a bit tired of my ' have you thought about using sketchup for this', gambit Still they're very tolerant and almost always do take up my offer of training.
Interestingly, the comments I always hear are 'I never knew that you could do so much with it'; 'I never knew that you could make such accurate drawings' and renders from Podium and latterly Hypershot really do seal the deal
So O.K. Sketchup doesn't have some of the whistles and bangs of solidworks et. al. but from my point of view I can think of no better package which not only provides an easy introduction to the world of design and 3D CAD but also has enough depth to allow students to produced design and studies all the way to Advanced level and beyond.
-
Did cathedrals using CAD?
-
@unknownuser said:
Did cathedrals using CAD?
Didn't they use models there too?
I say it was originally computer-aided "drafting". The early systems were very expensive and used by only a few firms. Then AutoCAD and some other personal computer CAD's came along. I saw a term "CADD" in the late 80's: This was "computer-aided drafting and design", but that term is not often used. I believe that early developers were seeking a way to draft on computers and were not focused on analysis and visualization aids that came later, especially when 3d came along.
If you are not yourself experienced in making production drawings for construction or manufacture, please understand that the statement that "SU is not CAD" is not snobbery. CAD is so much more than the scale image of the object. Just efficient tools for line types, text, dimensions, and symbols are a great part of CAD. Then there is layout and organization of documents, overlay of images, import of survey data etc. Following that are more advanced design aids such as parametric building elements, structural analysis, BIM, and CAD/CAM functions.
I have seen architects over the years looking for the all-in-one package. It really hasn't happened yet. They look to Revit, ArchiCAD or programs like ChiefArchitect. But there's always room for a better modeler, rendering programs, presentation tools, or a simpler 2d program for details and so on.
I am interested in learning about the export of SU 2d to CAD for construction drawings. I know that some architects actually do this with success. I certainly can see the use of SU elevations. Construction floor plans are more difficult because they are really more about symbols than pictographic representation.
-
In Film/Tv design it was Computer Assisted Drafting and started to come into it's own in the early 90's. The table drafters resisted but were eventually forced to move to CAD because of the speed factor. Some of the die-hards were never able to make the switch. In my Art Departments Vectorworks has become the prog of choice by set designers who either switched from table or came up through the biz. Architects moving to set design seem to use AutoCad but the interface with Vectorworks is problematic.
As far as SU goes I use it as a modelling tool during initial concepting, either by extrapolating ground plans or just spitballing ideas. I would never use it for issued building plans.
Advertisement