Блог ЛЕДАС
Salutations à Tous les Lecteurs Francophones!
Фев 16, 2022In the history of LEDAS, a big role was played by software companies in France. Our company got its start in 1999 by landing work with French CAD vendors. Since then, LEDAS has provided B2B R&D (business-to-business research and development) services to several well-known CAD and CAM companies in France in the field of computational geometry. This early experience helped shape the corporate culture of engineering software development at LEDAS.
Contracts with customers from France have been the longest in the history of LEDAS, two of which worked with us for over a decade. For Dassault Systèmes, LEDAS helped develop geometric constraint solvers and a 3D modeling kernel used by the CATIA mechanical design system. Another contract was done with an award-winning CAM company in the aerospace industry. ...
Pivot Points In the Story of LEDAS
Мар 30, 2021It’s just before our 22nd anniversary on April 1, and looking back at the history of LEDAS, I see that the first years from each decade were, for our company, the really important ones. Often, these years started new stories and finalized old ones.
Arguably, 2011 was the most pivotal year in LEDAS’ history. Let me list the top five events that happened to our company ten years ago:
- Top management changed completely when co-founder David Levin stepped back as CEO and took on the role of Chairman of the Board. A new generation of young managers, aged around 30 years old, now occupied the CEO, CTO, and COO positions.
- Thanks to advice from an industry mate, LEDAS decided to focus mostly on high-quality software R&D (research and ...
Why we use Visitor pattern in C++ CAD projects
Сен 14, 2020One hierarchy, many algorithms
Geometrical modeling projects often contain some form of central hierarchy of objects. A geometric kernel, for example, has a hierarchy of geometric entities. Another example is a geometric solver which has a hierarchy of objects and constraints. Simplified inheritance diagrams for these hierarchies are shown in the figures below.
Many routines/algorithms of other modules need to process all the entities in a hierarchy in a similar fashion, although with different implementation details. So, polymorphism naturally is used with these kinds of hierarchies.
Assuming we are talking about C++ (and this is usually the programming language of choice for algorithmic libraries in CAD), using virtual functions is the first consideration for implementing polymorphic behaviour.
However, a variety of routines applied to the entire hierarchy, ...
While working on LGS, the programmers at LEDAS developed similar software for Dassault Systèmes, which were integrated into CATIA and so are used by hundreds of thousands engineers in corporations like Toyota, Honda, Airbus, and Boeing. Much later, LEDAS was asked to develop constraint solvers that ...