3 ms·

It's old, it looks old, it's ideosyncratic. It became open source 20 years ago. Did it manage to engage a community during that time? In their "News" page, whic

It's old, it looks old, it's ideosyncratic. It became open source 20 years ago. Did it manage to engage a community during that time? In their "News" page, which is just their Facebook feed, you can see some projects during the last two years but (sorry) nothing remarkable. So, honestly, the project seems almost dead to me but for some reason refuses to die.

zokier 4y ago
Nevertheless it feels like brlcad is maybe the best foss cad at this time.
- arcanemachiner 4y ago
  From what I understand, FreeCAD is limited by the OpenCascade kernel. I wonder if brlcad could help to address this issue in any way.
  - regularfry 4y ago
    It's limited more by the way it uses it.
    - dymk 4y ago
      No, OpenCascade just kinda sucks to use.
    - blobfish01 4y ago
      In what ways is freecad using opencascade incorrectly?
  - blobfish01 4y ago
    brl-cad is CSG modeler with some BRep support. Opencascade is a BRep modeler that supports boolean operations. The industry gave up on CSG and went BRep decades ago.
    - RobotToaster 4y ago
      openSCAD is also a CSG modeller, and quite popular in 3d printing.
    - brlcad 4y ago
      Not entirely true. As an explicit edit method, sure, but several of the big-name non-parametric (i.e., solid modeling) commercial CAD systems are fundamentally still CSG representation under the hood. They just hide it well, typically under the guise of feature edit nomenclatures or editing constraints. Can find indications it's CSG under the hood if it won't let you directly modify a surface without selecting some "convert to editable representation" option. TinkerCAD is an extreme example that's basically a pure CSG modeler (and probably the most popular CAD system to date, but I digress), but you won't find the term union, intersection, or CSG anywhere in its GUI. Solidworks and NX do a really good job hiding it.
      - blobfish01 4y ago
        I guess we have a disconnect. I am talking about modeling kernel geometric definitions and data structures. Whether NX has or doesn't have the boolean terms (union, intersect ...etc) doesn't change the fact that parasolid is BRep. Just because parasolid supports boolean operations, doesn't mean it is CSG. IMHO: Any shape defined by a CSG modeling kernel can be defined in a BRep modeling kernel. The reverse is not true, short of some kind of 'hack'. BOT(bag of triangles)? Hybrid with mesh modeling?
  - brlcad 4y ago
    The topic has come up and been a point of discussion, especially developing something akin to the ACIS or Parasolid kernels, but open source. In many areas, BRL-CAD's capabilities far exceed what OpenCascade provides, particularly w.r.t. CAE features, and in others it is noticeably lacking (e.g. export to polygonal). Couple years of effort have been invested in developing a new C++ API for exactly this purpose (codename "MOOSE"). Current dev focus is on conversion, rendering, and GUI modernization.
    - ofrzeta 4y ago
      I wonder why do you care about rendering? There are many good open source renderers out there, now. For instance can't you just export the geometry and render with Yafaray?
rwmj 4y ago
Open source software doesn't need to die, as long as there's someone to maintain it. This project looks pretty active with regular commits: https://github.com/BRL-CAD/brlcad/commits/main https://github.com/BRL-CAD/brlcad/commits/main
- brlcad 4y ago
  Well said! Like many open source communities, pandemic had a pretty significant impact, but development and releases are quite active. New release coming out in a few weeks introduces conversion support for 150 new geometry and terrain file formats. This summer, Physically-based Rendering support is coming to open source CAD for the first time ever. All the while, devs are working on GUI infrastructure, mentoring GSoC, doing academic research, interacting with academia, and doing what they can to help foster an open source CAx community.
numpad0 4y ago
Fully agreed, solved problems should be considered dead and invalid so it will have to be solved time and time again, keeping human wisdom ephemeral and constantly eroding /s
brlcad 4y ago
BRL-CAD has a very rich and ongoing development history that is not immediately obvious. [1,2] Heavily actively used by gov'ts as it has unique features like validated full shotline solid ray tracing -- granted, not a feature most know, understand, or care about but absolutely critical to others. Development is actively funded annually (just not your priorities). In total, BRL-CAD today has more than 500 full-time staff-years of effort invested, more than pretty much all other open source CAD combined. There's simply no PR team, and limited bandwidth to provide support to those that don't contribute in kind. CAD modelers coming out of school are only accustomed to multibillion dollar company products that dedicated highly experienced devs to specific user-facing features under dedicated funding lines. With open source, skillsets vary wildly and coordination, collaboration, and maintenance are a challenge until a project achieves critical mass. It's something the BRL-CAD community is working hard on, but it's not something that will be quick. Contributors are welcome! [1] https://www.army.mil/article/92288/brl_cad_the_worlds_oldest_open_source_software_system https://www.army.mil/article/92288/brl_cad_the_worlds_oldest... [2] https://brlcad.org/BRL-CAD_Bibliography.pdf https://brlcad.org/BRL-CAD_Bibliography.pdf
- ofrzeta 4y ago
  Thanks for the info. I didn't want to rain on your parade but it just doesn't seem very active judging from the homepage. Also, if you want more community involvement you should probably provide binaries for platforms like Mac OS and Windows to attract more end users that may eventually lead to more developer engagement.

zokier 4y ago

Nevertheless it feels like brlcad is maybe the best foss cad at this time.

arcanemachiner 4y ago
From what I understand, FreeCAD is limited by the OpenCascade kernel. I wonder if brlcad could help to address this issue in any way.
- regularfry 4y ago
  It's limited more by the way it uses it.
  - dymk 4y ago
    No, OpenCascade just kinda sucks to use.
  - blobfish01 4y ago
    In what ways is freecad using opencascade incorrectly?
- blobfish01 4y ago
  brl-cad is CSG modeler with some BRep support. Opencascade is a BRep modeler that supports boolean operations. The industry gave up on CSG and went BRep decades ago.
  - RobotToaster 4y ago
    openSCAD is also a CSG modeller, and quite popular in 3d printing.
  - brlcad 4y ago
    Not entirely true. As an explicit edit method, sure, but several of the big-name non-parametric (i.e., solid modeling) commercial CAD systems are fundamentally still CSG representation under the hood. They just hide it well, typically under the guise of feature edit nomenclatures or editing constraints. Can find indications it's CSG under the hood if it won't let you directly modify a surface without selecting some "convert to editable representation" option. TinkerCAD is an extreme example that's basically a pure CSG modeler (and probably the most popular CAD system to date, but I digress), but you won't find the term union, intersection, or CSG anywhere in its GUI. Solidworks and NX do a really good job hiding it.
    - blobfish01 4y ago
      I guess we have a disconnect. I am talking about modeling kernel geometric definitions and data structures. Whether NX has or doesn't have the boolean terms (union, intersect ...etc) doesn't change the fact that parasolid is BRep. Just because parasolid supports boolean operations, doesn't mean it is CSG. IMHO: Any shape defined by a CSG modeling kernel can be defined in a BRep modeling kernel. The reverse is not true, short of some kind of 'hack'. BOT(bag of triangles)? Hybrid with mesh modeling?
- brlcad 4y ago
  The topic has come up and been a point of discussion, especially developing something akin to the ACIS or Parasolid kernels, but open source. In many areas, BRL-CAD's capabilities far exceed what OpenCascade provides, particularly w.r.t. CAE features, and in others it is noticeably lacking (e.g. export to polygonal). Couple years of effort have been invested in developing a new C++ API for exactly this purpose (codename "MOOSE"). Current dev focus is on conversion, rendering, and GUI modernization.
  - ofrzeta 4y ago
    I wonder why do you care about rendering? There are many good open source renderers out there, now. For instance can't you just export the geometry and render with Yafaray?

rwmj 4y ago

Open source software doesn't need to die, as long as there's someone to maintain it. This project looks pretty active with regular commits: https://github.com/BRL-CAD/brlcad/commits/main https://github.com/BRL-CAD/brlcad/commits/main

brlcad 4y ago
Well said! Like many open source communities, pandemic had a pretty significant impact, but development and releases are quite active. New release coming out in a few weeks introduces conversion support for 150 new geometry and terrain file formats. This summer, Physically-based Rendering support is coming to open source CAD for the first time ever. All the while, devs are working on GUI infrastructure, mentoring GSoC, doing academic research, interacting with academia, and doing what they can to help foster an open source CAx community.

numpad0 4y ago

Fully agreed, solved problems should be considered dead and invalid so it will have to be solved time and time again, keeping human wisdom ephemeral and constantly eroding /s

brlcad 4y ago

BRL-CAD has a very rich and ongoing development history that is not immediately obvious. [1,2] Heavily actively used by gov'ts as it has unique features like validated full shotline solid ray tracing -- granted, not a feature most know, understand, or care about but absolutely critical to others. Development is actively funded annually (just not your priorities). In total, BRL-CAD today has more than 500 full-time staff-years of effort invested, more than pretty much all other open source CAD combined. There's simply no PR team, and limited bandwidth to provide support to those that don't contribute in kind. CAD modelers coming out of school are only accustomed to multibillion dollar company products that dedicated highly experienced devs to specific user-facing features under dedicated funding lines. With open source, skillsets vary wildly and coordination, collaboration, and maintenance are a challenge until a project achieves critical mass. It's something the BRL-CAD community is working hard on, but it's not something that will be quick. Contributors are welcome! [1] https://www.army.mil/article/92288/brl_cad_the_worlds_oldest_open_source_software_system https://www.army.mil/article/92288/brl_cad_the_worlds_oldest... [2] https://brlcad.org/BRL-CAD_Bibliography.pdf https://brlcad.org/BRL-CAD_Bibliography.pdf

ofrzeta 4y ago
Thanks for the info. I didn't want to rain on your parade but it just doesn't seem very active judging from the homepage. Also, if you want more community involvement you should probably provide binaries for platforms like Mac OS and Windows to attract more end users that may eventually lead to more developer engagement.