8 ms·

Area programmer laments designers don’t use the same tools he does

114 points by iamwil 12y ago

msandford 12y ago
I couldn't agree more with this. I have actually been looking at writing a CAM program that uses OpenSCAD (and perhaps the python bindings to it) in order to generate gcode for machining. It would work great for me, but probably less so for the guys in the shop. Representing the OpenSCAD code as a tree you can fairly readily edit next to the renderer would help. Being able to click on something and have it pull up all the relevant nodes regarding that element for editing would be a huge help. Then of course the next step is being able to drag and get context menus for things like bolt circles or other kinds of symmetry. FreeCAD doesn't really cut it when it comes to trying to do these kinds of things, in my opinion.
- joshu 12y ago
  Seems like there would be a lot of distance between an openscad model and generating a toolpath in gcode. I currently use MeshCAM for this and have thought about writing something several times (usually while fuming.)
  - thawkins 12y ago
    OpenSCAD can generate either stl or wavefront obj (and several other formats), there are a lot of trivialy integratable tools that can go from there to gcode. Slic3r and CuraEngine to name but two.
dfc 12y ago
I am confused about the title. What is "Area"?
- chetanahuja 12y ago
  It's a riff on a common type of onion headline: e.g: http://www.theonion.com/articles/area-man-experimented-with-sex-back-in-college,37016/ http://www.theonion.com/articles/area-man-experimented-with-... (which itself, is a takeoff on thousands of "Area man/woman does X" type headlines in local newspapers everywhere.)
  - dfc 12y ago
    Thanks. HN Reader Lament^s ^That Authors Don't Follow Basic Rules of Grammar
- vinceguidry 12y ago
  It looks like a riff off of a common Onion news article headline pattern. Looking at their homepage now, I see these: "Area Man Experimented With Sex Back In College" "Lunch Barely Misses Area Man's Vital Organs" "Area Facebook User Incredibly Stupid"
  - rsl7 12y ago
    the "area man" on the onion is a satire of local news, the kind of thing you'd see in a small township newspaper
    - walshemj 12y ago
      Apparently taken from real life allegedly one vary parochial Scottish news paper reported the sinking of the titanic as "North-east man lost at sea" And they didn't mean north east Scotland it was an even smaller area.
ams6110 12y ago
It lends itself to a workflow where sometimes, a user checks out a file, and forgets to unlock it. Or goes on vacation. Then you have to forcibly check out the file your coworker locked to get work done. And when he has to merge his changes with yours again, it’s a gigantic hassle. This exactly describes web development on the Microsoft stack using Visual Source Safe. I don't know if that product exists anymore or still works the same way but the frustration with it is what drove the popularity of Subversion and then later Git.
- BugBrother 12y ago
  You were probably too Microsoft specific in your work environment. CVS is older than most(?) HN posters and had no locking problem. So your pain was not necessary. :-( (The wikipedia says VSS was bought 1995, so the original product might be older?)
  - wiml 12y ago
    CVS was developed in the '80s specifically to get around the locking problem that locking (non-concurrent — that's what the C in CVS is) version control systems had.
- gumby 12y ago
  Ah, ams6110, I feel your pain, but you have not encountered true agony until you have been subjected to... Perforce (aka p4). It feels like the p4 designers WANTED software development to be harder. Perhaps they recruit developers exclusively from the pool of former TSA agents.
  - philwelch 12y ago
    Perforce was fine compared to ClearCase.
jhawkinson 12y ago
Many years ago, when I was designing a part in AutoCad, I drew it by hand and then back-converted the drawing into parametrized AutoLISP, which I then stored under version control (RCS at the time). It'd be nice to have tools that make this easy. Though I'm honestly surprised more people don't do it anyhow.
- brudgers 12y ago
  With AutoCad or any software that exports DXF or IGES, Git or other version control would work fine. Nemetscheck VectorWorks wil export a design file as VectorScript [a super-set of Pascal].
- dugmartin 12y ago
  You can version AutoLISP but the output is so verbose (at least for machine generated code) that diffing versions is like diffing PDFs or PCL files. You can see the changes but they don't make any sense without the whole file being rendered. NOTE: Its been 20 years since I used AutoLISP and the code I was using was being generated from software that did cut-plan optimization for lathes so I am probably speaking from a very old/ignorant point of view.
  - jhawkinson 12y ago
    Huh? The whole point was to version the AutoLISP source, not its output. And I didn't really mean machine-generated code...human-generated. And of course, as for making sense, well, you have to use good commit logs as well. But maybe you're talking about some technology that generates AutoLISP from a GUI? I don't know anything about that...
chx 12y ago
> They are also not on github, which makes collaboration that much harder. This is now vim-emacs level zealotry. There are workflows which gasp do not mesh well with github. github issues/PRs have almost no metadata and absolutely none that the issue submitter can set.
- CognitiveLens 12y ago
  zealotry? It's one comment in an article dealing almost entirely with other issues. Github has become the de-facto place to put code that you want others to work with, and it is a platform built to surface such projects and make them accessible in a consistent way. It's not the only such tool, but it is really familiar to a lot of people, and that makes collaboration slightly easier for those who are familiar with it.
  - raverbashing 12y ago
    "Github has become the de-facto place to put code" Maybe in some districts of SF and SV, but apart from that, NO I love Github and I think that it is way better than most of "industry standarts" but amazingly, some people still use self hosted solutions, because they need it.
    - CognitiveLens 12y ago
      full quote: "Github has become the de-facto place to put code that you want others to work with". Maybe I should clarify: "others" == "people who don't know or directly work with you" Self-hosted solutions do not make collaboration simpler (in an OSS context), which is the reasonable, non-zealous claim made by the article.
      - raverbashing 12y ago
        For the strict issue of sharing code with others (open to everybody), sure, Github is the best solution But this is not what the article was talking about, it was talking about collaboration with other file formats, so jumping to say Github is good (on what we already know it's good and does not correspond to the discussion) is a stretch
ChuckMcM 12y ago
One of the more interesting things about 3D printing is that it is igniting this sort of issue. A long time ago (like 1991) I was a working for Sun and representing them at the "CAD Framework Initiative" efforts or CFI. The express goal of this was to create a set of interchange formats for CAD tools so that you could move things from one system to another, you could store and diff changes, and even if your vendor went out of business you could use your designs in another vendor's tool if it was CFI compliant. Now the irritating part was that Apollo Computer turned it into a DCE RPC vs ONC RPC thing when the committee started leaning toward the simpler RPC/XDR format that Sun had offered. The criminal part was that as soon as it became clear that the group was actually going to succeed nearly all support was yanked. The simple reality was that CAD tools cost literally hundreds of thousands of dollars for a large shop and those vendors desperately needed the 'lock in' effect of a propietary data format and tool chain to keep themselves in play during the inevitable periods where their tools totally sucked (waterfall development at its finest). It still bugs me when I think about it over 20 years later! So to say I would be a huge supporter of an open CAD standard is an understatement. And now that there is a fairly large body of people who are both code capable and desirous of such a standard in order to create, share, and modify 3D designs, there might be enough energy to make it happen.
- sitkack 12y ago
  We don't need a standard so much as both a plethora of special purpose tools (these are already here and more are in the works) AND an n:m pandoc style conversion utility. DXF/DWG will be with us for a long while.
  - krick 12y ago
    The open standard would be pretty helpful, if not sufficient for both. There even are no open source viewers for DWG files for the time being, so if I'm working on some new tool it is woth nothing to me that DWG is popular, because I can't use it without tons of effort.
- brudgers 12y ago
  Robust open-source CAD software would clearly fill a niche. The problem however, is not so much CAD as the schemas for the data that at gets attached to the models...IGES has been around for many decades, but what one engineer needs for FEA is not what the machinist needs for making the die or the Architect for making pretty pictures.
illumen 12y ago
Larch is a visual programming environment. http://www.larchenvironment.com/ http://www.larchenvironment.com/ The author also makes a procedural 3D modeler (http://gsculpt.sourceforge.net/ http://gsculpt.sourceforge.net/). You should definitely check both of them out, and talk to the communities. One of the main examples in Larch, is of modifying the visual representation of a polygon, rather than the textual representation. See: http://www.larchenvironment.com/what_does_it_do http://www.larchenvironment.com/what_does_it_do
krick 12y ago
I wonder which tools use people making real things with CNC machines. I assume that there's some specific, not really friendly file format which cannot be edited in some 3dMax or Blender, so some conversion is performed before, but, anyway, there must be some more or less standard workflow, I suppose.
- huuu 12y ago
  I think STL is a nice file format that is used a lot. It can be imported and exported in a lot of 3d software.
  - marcosscriven 12y ago
    STL is really bad for 3D printing IMO. It's just a bag of triangles - there's absolutely nothing tying those faces together, and it's thus a constant battle with floating point precision to make sure there's no 'holes' in models, so they can be effectively sliced.
    - jbargmann 12y ago
      Alternative? Do tell.
- dugmartin 12y ago
  It's been 20 years since I wrote any CNC controller software but the "assembly language" of CNC then was g-code (http://en.wikipedia.org/wiki/G-code http://en.wikipedia.org/wiki/G-code). In the end it really doesn't matter how your CAM software stores its data as long as you can translate it to g-code within the software or with a 3rd party compiler. The fun part for me back then was optimizing that translation with respect to the machine's capabilities so you can do things like minimize machining time while maximizing tool life and keeping surface roughness within tolerances.
- sehugg 12y ago
  You usually generate a "toolpath" which is a set of instructions for the machine to follow. For old MakerBots this was .gcode (http://en.wikipedia.org/wiki/G-code http://en.wikipedia.org/wiki/G-code) which is the exact instructions to control the toolhead. It's a standard insomuch as XML is a standard, that is, format but not content is standardized. The pros use something like SolidWorks and STEP or IGES to export to CAM.
Htsthbjig 12y ago
Open Source geometric kernel? It is called "Open Cascade": http://www.opencascade.org/ http://www.opencascade.org/ It represent decades of hard work from dozens of programmers.License is LGPL. Freecad is a very promising tool that uses the power of Opencascade only a little(Opencascade supports things that are way more complex than what freecad does). Everything in Freecad is a script in python.
- thawkins 12y ago
  Its also what forms the heart of OpenSCAD, which is built ontop of OpenCascade
  - marcosscriven 12y ago
    OpenSCAD is actually based on CGAL
    - keenerd 12y ago
      And OpenCSG.
- kanzure 12y ago
  Unfortunately, OpenCASCADE is an unmaintainable pile of code. There's https://github.com/tpaviot/oce https://github.com/tpaviot/oce but does anyone really want to maintain 3 million lines of poorly written source code? Here's what you will have to deal with if you dive in: http://diyhpl.us/wiki/cad/opencascade http://diyhpl.us/wiki/cad/opencascade :( So far the absolutely cleanest implementation I have seen is http://verbnurbs.com/ http://verbnurbs.com/ which is amazing. Seriously, go over here https://github.com/pboyer/verb https://github.com/pboyer/verb and compare. This is way, way cleaner than OpenNURBS like uh https://github.com/kanzure/brlcad/tree/master/src/other/openNURBS https://github.com/kanzure/brlcad/tree/master/src/other/open... here. And it has tests distributed with the source code, so hey you can actually attempt to maintain it if you are into that.
  - iamwil 12y ago
vikingo 12y ago
The academic field of Engineering Informatics addresses the particular issues the author raised as well as other connected issues. These problems are acutely relevant today although the issues have been known and attempts have been made to address them by many other concerned folk many times over for at least the last 20+ years with varying degrees of success. Given the poor state of engineering knowledge storage and collaboration and the effect this has on engineering productivity, it is a space begging for one of Clay Christensen's famous "Disruptive Innovations". As you point out the change is unlikely to come from existing vendors at they prefer file format lock-in. When the tide shifts this could be an Achilles' heel although I would expect the vendors to adapt. One of the most intractable issues is that each type of engineering has it's own heterogenous method of describing and recording their work. The best research I have encountered seems to point to Semantic technologies having the most to offer to possible solutions.
Animats 12y ago
Most of the people commenting here haven't used those tools. In a modern CAD system, like SolidWorks and Autodesk Inventor, the systems retain much more than geometry. There's lots of structure. "This is a round hole" (STL doesn't even have that.) "This part is a 6/32 screw, pan head, 3/4 inch length". "This edge of this part aligns with this other edge of this other part" "This part is made of mild steel". "This subassembly is made of these parts and is used in these larger assemblies". "The holes in this part are projected downward from the larger assembly so the holes will line up". All the serious CAD systems today understand those kinds of things. An object is represented as a series of operations in constructive solid geometry, not a mesh. Relationships between parts are modeled. Many parts are parametric - some dimensions depend on other dimensions, and you can change one and have the others change appropriately. ("Appropriately" means this is more than scaling; making the thing longer doesn't turn round holes into ellipses.) Capturing all that structure is complicated. Open Cascade doesn't do any of that stuff; it's just a geometry library. Revision control for models is available. Autodesk has Autodesk Vault. Solidworks has Workgroup PDM. Revisions can be compared visually. It's a hard problem, and errors tend to have serious consequences, which is why most engineering shops have a rather rigid workflow. Over in the animation world, there's Alienbrain, a very expensive revision control system for big animation and game projects. There, you have many different formats to coordinate - video, background art, motion capture data, textures, etc., with different people working on each. These tools are expensive because the market isn't that big but the value they add is large.
- ultimape 12y ago
  I'm curious if you could recommend a way to do parametric design with SolidWorks. The way my friend was doing it, the system ended up chugging like a pig and he had a rather impressive machine. I'd prefer a system involved with a programming language. I get the impression that SW isn't geared to do that because the market they serve doesn't care for that level of control.

114 points by iamwil 12y ago

I couldn't agree more with this. I have actually been looking at writing a CAM program that uses OpenSCAD (and perhaps the python bindings to it) in order to generate gcode for machining. It would work great for me, but probably less so for the guys in the shop. Representing the OpenSCAD code as a tree you can fairly readily edit next to the renderer would help. Being able to click on something and have it pull up all the relevant nodes regarding that element for editing would be a huge help. Then of course the next step is being able to drag and get context menus for things like bolt circles or other kinds of symmetry. FreeCAD doesn't really cut it when it comes to trying to do these kinds of things, in my opinion.

joshu 12y ago
Seems like there would be a lot of distance between an openscad model and generating a toolpath in gcode. I currently use MeshCAM for this and have thought about writing something several times (usually while fuming.)
- thawkins 12y ago
  OpenSCAD can generate either stl or wavefront obj (and several other formats), there are a lot of trivialy integratable tools that can go from there to gcode. Slic3r and CuraEngine to name but two.

dfc 12y ago

I am confused about the title. What is "Area"?

chetanahuja 12y ago
It's a riff on a common type of onion headline: e.g: http://www.theonion.com/articles/area-man-experimented-with-sex-back-in-college,37016/ http://www.theonion.com/articles/area-man-experimented-with-... (which itself, is a takeoff on thousands of "Area man/woman does X" type headlines in local newspapers everywhere.)
- dfc 12y ago
  Thanks. HN Reader Lament^s ^That Authors Don't Follow Basic Rules of Grammar
vinceguidry 12y ago
It looks like a riff off of a common Onion news article headline pattern. Looking at their homepage now, I see these: "Area Man Experimented With Sex Back In College" "Lunch Barely Misses Area Man's Vital Organs" "Area Facebook User Incredibly Stupid"
- rsl7 12y ago
  the "area man" on the onion is a satire of local news, the kind of thing you'd see in a small township newspaper
  - walshemj 12y ago
    Apparently taken from real life allegedly one vary parochial Scottish news paper reported the sinking of the titanic as "North-east man lost at sea" And they didn't mean north east Scotland it was an even smaller area.

ams6110 12y ago

It lends itself to a workflow where sometimes, a user checks out a file, and forgets to unlock it. Or goes on vacation. Then you have to forcibly check out the file your coworker locked to get work done. And when he has to merge his changes with yours again, it’s a gigantic hassle. This exactly describes web development on the Microsoft stack using Visual Source Safe. I don't know if that product exists anymore or still works the same way but the frustration with it is what drove the popularity of Subversion and then later Git.

BugBrother 12y ago
You were probably too Microsoft specific in your work environment. CVS is older than most(?) HN posters and had no locking problem. So your pain was not necessary. :-( (The wikipedia says VSS was bought 1995, so the original product might be older?)
- wiml 12y ago
  CVS was developed in the '80s specifically to get around the locking problem that locking (non-concurrent — that's what the C in CVS is) version control systems had.
gumby 12y ago
Ah, ams6110, I feel your pain, but you have not encountered true agony until you have been subjected to... Perforce (aka p4). It feels like the p4 designers WANTED software development to be harder. Perhaps they recruit developers exclusively from the pool of former TSA agents.
- philwelch 12y ago
  Perforce was fine compared to ClearCase.

jhawkinson 12y ago

Many years ago, when I was designing a part in AutoCad, I drew it by hand and then back-converted the drawing into parametrized AutoLISP, which I then stored under version control (RCS at the time). It'd be nice to have tools that make this easy. Though I'm honestly surprised more people don't do it anyhow.

brudgers 12y ago
With AutoCad or any software that exports DXF or IGES, Git or other version control would work fine. Nemetscheck VectorWorks wil export a design file as VectorScript [a super-set of Pascal].
dugmartin 12y ago
You can version AutoLISP but the output is so verbose (at least for machine generated code) that diffing versions is like diffing PDFs or PCL files. You can see the changes but they don't make any sense without the whole file being rendered. NOTE: Its been 20 years since I used AutoLISP and the code I was using was being generated from software that did cut-plan optimization for lathes so I am probably speaking from a very old/ignorant point of view.
- jhawkinson 12y ago
  Huh? The whole point was to version the AutoLISP source, not its output. And I didn't really mean machine-generated code...human-generated. And of course, as for making sense, well, you have to use good commit logs as well. But maybe you're talking about some technology that generates AutoLISP from a GUI? I don't know anything about that...

chx 12y ago

> They are also not on github, which makes collaboration that much harder. This is now vim-emacs level zealotry. There are workflows which gasp do not mesh well with github. github issues/PRs have almost no metadata and absolutely none that the issue submitter can set.

CognitiveLens 12y ago
zealotry? It's one comment in an article dealing almost entirely with other issues. Github has become the de-facto place to put code that you want others to work with, and it is a platform built to surface such projects and make them accessible in a consistent way. It's not the only such tool, but it is really familiar to a lot of people, and that makes collaboration slightly easier for those who are familiar with it.
- raverbashing 12y ago
  "Github has become the de-facto place to put code" Maybe in some districts of SF and SV, but apart from that, NO I love Github and I think that it is way better than most of "industry standarts" but amazingly, some people still use self hosted solutions, because they need it.
  - CognitiveLens 12y ago
    full quote: "Github has become the de-facto place to put code that you want others to work with". Maybe I should clarify: "others" == "people who don't know or directly work with you" Self-hosted solutions do not make collaboration simpler (in an OSS context), which is the reasonable, non-zealous claim made by the article.
    - raverbashing 12y ago
      For the strict issue of sharing code with others (open to everybody), sure, Github is the best solution But this is not what the article was talking about, it was talking about collaboration with other file formats, so jumping to say Github is good (on what we already know it's good and does not correspond to the discussion) is a stretch

ChuckMcM 12y ago

One of the more interesting things about 3D printing is that it is igniting this sort of issue. A long time ago (like 1991) I was a working for Sun and representing them at the "CAD Framework Initiative" efforts or CFI. The express goal of this was to create a set of interchange formats for CAD tools so that you could move things from one system to another, you could store and diff changes, and even if your vendor went out of business you could use your designs in another vendor's tool if it was CFI compliant. Now the irritating part was that Apollo Computer turned it into a DCE RPC vs ONC RPC thing when the committee started leaning toward the simpler RPC/XDR format that Sun had offered. The criminal part was that as soon as it became clear that the group was actually going to succeed nearly all support was yanked. The simple reality was that CAD tools cost literally hundreds of thousands of dollars for a large shop and those vendors desperately needed the 'lock in' effect of a propietary data format and tool chain to keep themselves in play during the inevitable periods where their tools totally sucked (waterfall development at its finest). It still bugs me when I think about it over 20 years later! So to say I would be a huge supporter of an open CAD standard is an understatement. And now that there is a fairly large body of people who are both code capable and desirous of such a standard in order to create, share, and modify 3D designs, there might be enough energy to make it happen.

sitkack 12y ago
We don't need a standard so much as both a plethora of special purpose tools (these are already here and more are in the works) AND an n:m pandoc style conversion utility. DXF/DWG will be with us for a long while.
- krick 12y ago
  The open standard would be pretty helpful, if not sufficient for both. There even are no open source viewers for DWG files for the time being, so if I'm working on some new tool it is woth nothing to me that DWG is popular, because I can't use it without tons of effort.
brudgers 12y ago
Robust open-source CAD software would clearly fill a niche. The problem however, is not so much CAD as the schemas for the data that at gets attached to the models...IGES has been around for many decades, but what one engineer needs for FEA is not what the machinist needs for making the die or the Architect for making pretty pictures.

illumen 12y ago

Larch is a visual programming environment. http://www.larchenvironment.com/ http://www.larchenvironment.com/ The author also makes a procedural 3D modeler (http://gsculpt.sourceforge.net/ http://gsculpt.sourceforge.net/). You should definitely check both of them out, and talk to the communities. One of the main examples in Larch, is of modifying the visual representation of a polygon, rather than the textual representation. See: http://www.larchenvironment.com/what_does_it_do http://www.larchenvironment.com/what_does_it_do

krick 12y ago

I wonder which tools use people making real things with CNC machines. I assume that there's some specific, not really friendly file format which cannot be edited in some 3dMax or Blender, so some conversion is performed before, but, anyway, there must be some more or less standard workflow, I suppose.

huuu 12y ago
I think STL is a nice file format that is used a lot. It can be imported and exported in a lot of 3d software.
- marcosscriven 12y ago
  STL is really bad for 3D printing IMO. It's just a bag of triangles - there's absolutely nothing tying those faces together, and it's thus a constant battle with floating point precision to make sure there's no 'holes' in models, so they can be effectively sliced.
  - jbargmann 12y ago
    Alternative? Do tell.
dugmartin 12y ago
It's been 20 years since I wrote any CNC controller software but the "assembly language" of CNC then was g-code (http://en.wikipedia.org/wiki/G-code http://en.wikipedia.org/wiki/G-code). In the end it really doesn't matter how your CAM software stores its data as long as you can translate it to g-code within the software or with a 3rd party compiler. The fun part for me back then was optimizing that translation with respect to the machine's capabilities so you can do things like minimize machining time while maximizing tool life and keeping surface roughness within tolerances.
sehugg 12y ago
You usually generate a "toolpath" which is a set of instructions for the machine to follow. For old MakerBots this was .gcode (http://en.wikipedia.org/wiki/G-code http://en.wikipedia.org/wiki/G-code) which is the exact instructions to control the toolhead. It's a standard insomuch as XML is a standard, that is, format but not content is standardized. The pros use something like SolidWorks and STEP or IGES to export to CAM.

Htsthbjig 12y ago

Open Source geometric kernel? It is called "Open Cascade": http://www.opencascade.org/ http://www.opencascade.org/ It represent decades of hard work from dozens of programmers.License is LGPL. Freecad is a very promising tool that uses the power of Opencascade only a little(Opencascade supports things that are way more complex than what freecad does). Everything in Freecad is a script in python.

thawkins 12y ago
Its also what forms the heart of OpenSCAD, which is built ontop of OpenCascade
- marcosscriven 12y ago
  OpenSCAD is actually based on CGAL
  - keenerd 12y ago
    And OpenCSG.
kanzure 12y ago
Unfortunately, OpenCASCADE is an unmaintainable pile of code. There's https://github.com/tpaviot/oce https://github.com/tpaviot/oce but does anyone really want to maintain 3 million lines of poorly written source code? Here's what you will have to deal with if you dive in: http://diyhpl.us/wiki/cad/opencascade http://diyhpl.us/wiki/cad/opencascade :( So far the absolutely cleanest implementation I have seen is http://verbnurbs.com/ http://verbnurbs.com/ which is amazing. Seriously, go over here https://github.com/pboyer/verb https://github.com/pboyer/verb and compare. This is way, way cleaner than OpenNURBS like uh https://github.com/kanzure/brlcad/tree/master/src/other/openNURBS https://github.com/kanzure/brlcad/tree/master/src/other/open... here. And it has tests distributed with the source code, so hey you can actually attempt to maintain it if you are into that.
- iamwil 12y ago

vikingo 12y ago

The academic field of Engineering Informatics addresses the particular issues the author raised as well as other connected issues. These problems are acutely relevant today although the issues have been known and attempts have been made to address them by many other concerned folk many times over for at least the last 20+ years with varying degrees of success. Given the poor state of engineering knowledge storage and collaboration and the effect this has on engineering productivity, it is a space begging for one of Clay Christensen's famous "Disruptive Innovations". As you point out the change is unlikely to come from existing vendors at they prefer file format lock-in. When the tide shifts this could be an Achilles' heel although I would expect the vendors to adapt. One of the most intractable issues is that each type of engineering has it's own heterogenous method of describing and recording their work. The best research I have encountered seems to point to Semantic technologies having the most to offer to possible solutions.

Animats 12y ago

Most of the people commenting here haven't used those tools. In a modern CAD system, like SolidWorks and Autodesk Inventor, the systems retain much more than geometry. There's lots of structure. "This is a round hole" (STL doesn't even have that.) "This part is a 6/32 screw, pan head, 3/4 inch length". "This edge of this part aligns with this other edge of this other part" "This part is made of mild steel". "This subassembly is made of these parts and is used in these larger assemblies". "The holes in this part are projected downward from the larger assembly so the holes will line up". All the serious CAD systems today understand those kinds of things. An object is represented as a series of operations in constructive solid geometry, not a mesh. Relationships between parts are modeled. Many parts are parametric - some dimensions depend on other dimensions, and you can change one and have the others change appropriately. ("Appropriately" means this is more than scaling; making the thing longer doesn't turn round holes into ellipses.) Capturing all that structure is complicated. Open Cascade doesn't do any of that stuff; it's just a geometry library. Revision control for models is available. Autodesk has Autodesk Vault. Solidworks has Workgroup PDM. Revisions can be compared visually. It's a hard problem, and errors tend to have serious consequences, which is why most engineering shops have a rather rigid workflow. Over in the animation world, there's Alienbrain, a very expensive revision control system for big animation and game projects. There, you have many different formats to coordinate - video, background art, motion capture data, textures, etc., with different people working on each. These tools are expensive because the market isn't that big but the value they add is large.

ultimape 12y ago
I'm curious if you could recommend a way to do parametric design with SolidWorks. The way my friend was doing it, the system ended up chugging like a pig and he had a rather impressive machine. I'd prefer a system involved with a programming language. I get the impression that SW isn't geared to do that because the market they serve doesn't care for that level of control.