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  • CGS versus Brep

    From babochenko.denis@yandex.ru@21:1/5 to All on Thu May 25 00:11:56 2017
    четверг, 21 февраля 2008 г., 8:36:03 UTC+3 пользователь Edward T Eaton написал:
    You are right... most real CAD systems are based on the BREP with
    different user interfaces. Excepting interface changes and certain
    modeling algorithms (like SolidWorks Boundary and Surface Fill), they
    are mostly interchangeable. And even these goodies are modifications
    beholden to the BREP. And when it comes to NURBS, there are still
    unrealized applications.

    The only thing I could find on a quick search about CSG based
    modellers is that ' constructive solid geometry is performed on
    polygonal meshes'.

    Please let me know if I missed something, but as described meshes are
    crap dead-ends for manufacturing. Give that up - they are old, dead technologies, way behind the curve.

    The thing that bugs me as a professional product developer is that the
    BREP, as a product, feels like a dead end.
    It's good - we get our jobs done, don't get me wrong about that. There
    is a lot of history behind that statement that would take a long time
    to get into.
    But after being at SolidWorks World 2008 (and prior history) for a
    wild night where I was meeting with a number of folks from a number of established and startup companies it was clear that most CAD we see
    today is being driven by folks pursuing the still unrealized aspects
    of the Computervision dream.
    At the core of everyone's development is the BREP, and they are all
    chasing the same dog.
    As someone who is very conscious of the BREP, I know that most of our modeling pain come from the limitations of the BREP.

    I can say this... 20 years from now we won't be talking BREP anymore (excepting legacy applications). There are new techs I've been hinted
    to, and there better be lots of new techs that "I am too small a
    player" to be hinted to. The BREP is near its end. My gut says that
    in five years we will see the first real commercialization of the new paradigm, and in 20 years we will be saying BREP... what's that???

    almost 10 years later this is kinda not true

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  • From Daniel Timmerman@21:1/5 to Edward T Eaton on Tue May 25 05:42:23 2021
    On Thursday, 21 February 2008 at 05:36:03 UTC, Edward T Eaton wrote:
    You are right... most real CAD systems are based on the BREP with
    different user interfaces. Excepting interface changes and certain
    modeling algorithms (like SolidWorks Boundary and Surface Fill), they
    are mostly interchangeable. And even these goodies are modifications
    beholden to the BREP. And when it comes to NURBS, there are still
    unrealized applications.
    The only thing I could find on a quick search about CSG based
    modellers is that ' constructive solid geometry is performed on
    polygonal meshes'.
    Please let me know if I missed something, but as described meshes are
    crap dead-ends for manufacturing. Give that up - they are old, dead technologies, way behind the curve.
    The thing that bugs me as a professional product developer is that the
    BREP, as a product, feels like a dead end.
    It's good - we get our jobs done, don't get me wrong about that. There
    is a lot of history behind that statement that would take a long time
    to get into.
    But after being at SolidWorks World 2008 (and prior history) for a
    wild night where I was meeting with a number of folks from a number of established and startup companies it was clear that most CAD we see
    today is being driven by folks pursuing the still unrealized aspects
    of the Computervision dream.
    At the core of everyone's development is the BREP, and they are all
    chasing the same dog.
    As someone who is very conscious of the BREP, I know that most of our modeling pain come from the limitations of the BREP.
    I can say this... 20 years from now we won't be talking BREP anymore (excepting legacy applications). There are new techs I've been hinted
    to, and there better be lots of new techs that "I am too small a
    player" to be hinted to. The BREP is near its end. My gut says that
    in five years we will see the first real commercialization of the new paradigm, and in 20 years we will be saying BREP... what's that???
    I am super dissapointed to say this has not aged well! I am doing a course at Loughborough Uni and found this comment looking up the difference between Brep and CSG because apparently its still relevent (my god the lecture notes are old though). Either
    way, this discussion has been useful to me, so thank you for having it 13 years ago!

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