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29 May 2007

LEDAS releases the fourth commercial version of its variational geometric solver LGS 3D.

LEDAS Ltd. , an independent software provider of computational components for PLM and ERP, releases next version of its 3D geometric solver.

The new 1.3 release is much more rapid than previous versions of LGS 3D. Due to efficient optimization of the core computational techniques all user functions of LGS 3D like Update or Move Under Constraints are executed twice as fast being measured on a large industrial test base of more than three thousand cases. Enforced by a number of new heuristics LGS 3D 1.3 behavior is much more natural from user point of view. All these advantages coupled with affordable pricing make LGS 3D the best deal for CAD/CAM/CAE parameterization.

About LGS 3D

LGS 3D is a cross-platform software. It is set of libraries that runs under all Windows, Linux, *BSD, AIX and other OS. Being written in C++, LGS has a C-based API that allows integrating it into a broad range of software applications (even written not in C/C++).

A sample test application for LGS 3D called Legen’d 3D is also available within the Evaluation version of LGS 3D. It is created with the Open CASCADE open-source framework. The Lege’n’d 3D application can be used to test the entire functionality of the LGS 3D without integrating the solver into other software packages. A set of representative examples for Lege’n’d 3D is also supplied. All advantages of the new LGS 3D version are accompanied by improvement of usability of Lege’n’d, by providing more useful information in case of incorrect usage of LGS 3D API functions, and a number of minor enhancements.

LGS 3D supports creation and modification of the geometric models by means of (explicit or implicit) constraints. Typical geometric objects are points, lines, circles, planes, cylinders, spheres, arbitrary curves, surfaces and swept surfaces. Objects can be fixed in an absolute coordinate system or with respect to each other (last feature is provided by so-called rigid sets of objects). Set of geometric constraints includes logical constraints between geometric entities (like coincidence, parallelism, tangency, etc.), dimensional constraints (that specify the required values for given distances, angles or radii). LGS 3D moves and rotates objects to positions where all constraints are satisfied trying to perform minimal possible transformations of initial configuration. Other functions are usual for CAD - ‘move under constraints’ and diagnostics of over- and under-defined parts of a model. The 1.3 version supports advanced features like engineering equations and help points.

LGS 3D is based on the LEDAS’ state-of-the-art computational engine and provides affordable solution for those who need a strong variational and constraint-based functionality in CAD, modeling, or engineering software. Through the scalable architecture of LGS, variational and parametric techniques have become available in a wide range of the products including desktop CAD, and general 3D modeling tools. High-end CAD and CAM systems will also benefit from integration with LGS since it provides a solid foundation for variational modeling, knowledge-based engineering, constraint-based geometry, and mechanical optimizations.

Being a LGS 2D successor of, LGS 3D can be used as a self-supporting component, or just jointly with 2D version. LEDAS three-dimensional geometric solver significantly expands application possibilities to apply computational engine. It supports creation and modification of the 3D geometric models. Both 2D and 3D versions have similar API, the set of three-dimensional objects and constraints intersect with the analogous set in two dimensional case, therefore, providing a complete parametric solution for all aspects of CAD/CAM system functionality – from 2D sketching to 3D modeling, kinematics simulation, assembly design and analysis.

LGS is a trademark of LEDAS Ltd. Windows is a registered trademark of Microsoft Corporation in the United States and other countries. Linux is a registered trademark of Linus Torvalds. BSD is a registered trademark of Berkeley Software Design, Inc. AIX is a registered trademark of International Business Machines Corporation. Open CASCADE is a registered trademark of Open CASCADE S.A.


LEDAS Ltd. is an independent software 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 PLM components: 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 and ERP markets: software development, consulting, reselling as well as education and training. Detailed information about LEDAS is available on the Internet at:

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