delhanty

51 ms·

1. 421.▲
   by delhanty 11y ago

   My point was that the use of Euler Spirals (aka clothoids) were ubiquitous in commercial CAD systems for highway design well before Raph Levien's work in fonts. My datapoint of 1995 in Japan certainly would not have been the first, bu
2. 422.▲
   by delhanty 11y ago

   Raph's thesis is a great piece of work. Having said that, it's worth making clear that the use of Euler Spirals in CAD predates his work. (His thesis is clear about this point.) In highway design they are known as clothoids. ht
3. 423.▲
   by delhanty 11y ago

   NURBS curve can always be converted to piecewise Bézier by repeated knot-insertion. Having said that I too prefer spirals. Designing with piecewise Bézier curves is just a bad idea. Piecewise Bézier is a fine representation format once the
4. 424.▲
   by delhanty 11y ago

   Terry Tao's a mathematician and he seems to think their ideas are interesting: https://terrytao.wordpress.com/2016/03/14/biases-between-con...
5. 425.▲
   by delhanty 11y ago

   I have 1Password on Mac and the 1Password Chrome extension. But for typing my master password in, I always use the Mac application. That's because I'm worried that the Chrome extension might be vulnerable.
6. 426.▲
   by delhanty 11y ago

   The paper must have been endorsed by an arXiv endorser: http://arxiv.org/help/endorsement Who the endorser is doesn't seem to be public though.
7. 427.▲
   by delhanty 11y ago

   Thank you for the useful links.
8. 428.▲
   by delhanty 11y ago

   > This is part of why deep learning and tensor methods work so well on image classification tasks. That statement sounds informative. Do you have a good non-specialist's reference?
9. 429.▲
   by delhanty 11y ago

   They also have Inventor Fusion, which is gratis (or at least used to be) on the Mac App Store - not sure what the Windows version costs. That and OnShape are probably the most capable $0 options for parametric solid CAD.
10. 430.▲
    by delhanty 12y ago

    Yes, it was a very different environment. Here's one for the BBC Micro: http://www.computinghistory.org.uk/det/6637/BASIC%20ROM%20Us... From other details on the page, it looks like the publisher, Adder Publ
11. 431.▲
    by delhanty 12y ago

    Here's another nice big number link: http://www.scottaaronson.com/writings/bignumbers.html If the inverse of the Ackerman function grows more slowly than loglogloglog...log, and the inverse of BB(N) grows more slo
12. 432.▲
    by delhanty 12y ago

    Does anyone know whether the full-server side .NET stack open sourcing includes C++/CLI? My experience has been that .NET interop with C++ code bases using C++/CLI was much smoother than with PInvoke. It would be if that were cro
13. 433.▲
    by delhanty 12y ago

    I emailed you - also checked out http://visidraft.com/ - looks like you are mainly involved in architectural CAD right now? Edit: spelling
14. 434.▲
    by delhanty 12y ago

    I emailed you. Also, I just re-read your post on reverse engineering the SolidWorks format ( http://heybryan.org/solidworks_file_format.html ). Re: code review - I'd have to think carefully about that - might put me in
15. 435.▲
    by delhanty 12y ago

    I emailed you. Clara.io looks wicked! Also, it looks like it was a lot of hard work to write. Parasolid, Acis and ShapeManager have a lot in common because they all originate from the same Romulus family tree in Cambridge, United Kingdom.
16. 436.▲
    by delhanty 12y ago

    Well is it open source in the sense that they are accepting patches? The way I read it was that you get the source and you like it or lump it. The bar for the meaning of "open" in CAD is pretty low though. Have you looked at Sie
17. 437.▲
    by delhanty 12y ago

    Kudos to Verbnurbs for what they have achieved. I would agree that OpenCASCADE is bloated - it has been since Matra Datavision failed to make a commercial product of the pre-open CASCADE that they ripped out of Euclid. There isn't mu
18. 438.▲
    by delhanty 12y ago

    Ex Parasolid (1989-1995), D-Cubed (1995-2000), and SolidWorks (2001-2002) dev here. Many are built on Parasolid, but many are not. Of your list only SolidWorks is built on Parasolid. Siemens own products (NX, SolidEdge) are built on Paras
19. 439.▲
    by delhanty 12y ago

    A comparison w.r.t. the PNG grammar sounds like an excellent starting point. I could see educational value (and more) in attempting a bi-directional translator between the two grammar formats.
20. 440.▲
    by delhanty 12y ago

    The grammars are for various 2D & 3D CAD model formats. Some can be fairly complicated, and the data files can be fairly large. For clarity, I'm bootstrapping something and don't have any immediate plans to open source the g
21. 441.▲
    by delhanty 12y ago

    Thanks, I did not know he was on github. But does he have a repository for "Synalyze It!"? I cannot see one. It looks like he has open sourced some supporting frameworks ... edit: grammar
22. 442.▲
    by delhanty 12y ago

    The "Synalyze It!" grammar format is XML, and the developer has some sample grammars for download: https://www.synalysis.net/formats.xml Having wanted a binary grammar format for a while, and just purchased the Pr
23. 443.▲
    by delhanty 13y ago

    Sometimes you do get multiple heaps, but it can be made to work if one is careful not to allocate on one heap and then free on the other heap. One example is a C/C++ COM addin for Excel say - instead of freeing the Excel allocated mem