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9 Apr 2009

LEDAS Announces Availability of its Variational Geometric Solver LGS for the Mac

Driven by Increasing Customer Demand for Parametric Modeling Applications on Mac OS X

Novosibirsk, Russia, April 9, 2009 – LEDAS Ltd., an independent provider of computational components and software development services for the CAD/PLM (Computer-Aided Design and Product Lifecycle Management) market, today announced it ported LGS, its variational geometric solver software, to Mac OS X. Licensed by the world leading software development companies in CAD, CAM and CAE, the LEDAS geometric solver is a powerful parametric engine for sketching, drawing, history-free 3D modeling, bottom-up assembly design, and kinematic simulation applications.

"We are pleased to offer our LGS software to satisfy increasing customer demand for parametric applications on Mac OS X,” said Dmitry Ushakov, Director of Product Management, LEDAS Ltd. "Being a traditional choice for design professionals, the Mac platform still lacks powerful parametric CAD solutions. LGS is LEDAS' first product for the Mac, and we have already started work on porting our Driving Dimensions plugin to this platform."

Both components LGS 2D and 3D have been completely ported to Mac OS X, and tested on a base of 10,000 industrial parametric models. Sales and support of LGS 2D/3D for Mac OS X v10.4 and v10.5 are available immediately after issuing this press release, older versions can be supported on request. LEDAS does not plan to port its Lege’n’d demo applications to Mac OS X; however, before the end of Q2’2009 LEDAS will release a Mac version of its plugin Driving Dimensions for Google SketchUp. Mac users can download a free version of this plugin to evaluate the performance and robustness of LGS 3D. The announcement will be published at

LGS 2D/3D can be licensed by any CAD development company or by an individual developer on a flat annual fee basis with no per copy royalties. A free evaluation version is available. LEDAS has an affordable licensing policy for start-up companies.

About LGS Software

Variational geometric solvers LGS 2D and LGS 3D are computational modules engineered to support two-dimensional parametric sketching/drawing, history-free 3D modeling, bottom-up assembly design, kinematics analysis, and other applications that require parametric connections or constraints to be set between geometrical objects.

LGS 2D/3D supports creation and modification of the geometric models by means of (explicit or implicit) constraints. Typical geometric objects are points, lines, circles, or black-box parametric curves. Objects can be fixed in the absolute coordinate system or with respect to each other (the latter feature is provided by the so-called rigid sets of objects). A set of geometric constraints includes logical constraints between geometric entities (like coincidence, parallelism, tangency, etc.), and dimensional constraints (that specify the required values for the given distances, angles or radii). LGS 2D/3D also supports user-defined variables, algebraic and black-box equations, and tabular constraints that can be arbitrarily mixed with geometric dimensions. LGS 2D/3D moves and rotates objects to the positions where all constraints are satisfied with minimal possible transformations of the initial configuration. Both LGS 2D and LGS 3D are simultaneous solvers: they can solve cyclic dependencies between constraints. Under-constrained and over-constrained models can also be efficiently solved as well. Additional features of LGS 2D/3D are dynamic constraint solving (while dragging an object) and redundant/inconsistent constraint diagnostics.

LGS is a cross-platform software package. It is a set of binary libraries that runs under all 32- and 64-bit Windows, Mac OS X, Linux, *BSD, AIX, HP-Unix, Sun Solaris, and other OS. Coded in C++, LGS 2D/3D has a pure C API for integration into a broad range of software applications. Each solver can be used as a self-supporting component, or jointly as a bundle of 2D+3D versions.

Two sample Windows applications called Lege'n'd 2D and Lege'n’d 3D are freely available at the LEDAS web site with a set of representative examples. Lege'n'd 2D is a simple variational sketcher, while Lege’n’d 3D can be used to create and animate assemblies from parts in IGES/STEP formats. These applications can be used by anyone to test functionality, robustness and performance of LGS 2D/3D. They were created with the Open CASCADE open-source application framework. The source code of Lege'n'd 2D/3D is available upon a special request.

To learn more about LGS, please visit LEDAS website at and


LEDAS Ltd. is an independent software development company founded in 1999; it is based in Novosibirsk Scientific Centre (Akademgorodok), Siberian Branch of the Russian Academy of Science. A leader in constraint-based technologies, LEDAS is a well-known provider of computational software components for PLM (Product Lifecycle Management) solutions: geometric constraint solvers for CAD/CAM/CAE, optimization engines for Project Management, Work Scheduling and Meeting Planning as well as interval technologies for Knowledge-Based Engineering and Collaborative Design. The company also provides services for PLM market: software development, consulting, reselling as well as education and training. More information about LEDAS is available at

LEDAS Marketing Department
phone: +7 383 3356 504
fax: +7 383 3356 256

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