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Press-releases      23 Sep 2008

LEDAS increases the productivity of LGS 2D variational geometric solver

LEDAS Ltd., an independent software provider of computational components for PLM and ERP, releases the next version of its 2D geometric solver.

The main goal of the current release is to improve of solver quality, i.e. such characteristics as success rate, performance and naturality of obtained solutions, rather than add a new functionality. Internal solver architecture is significantly improved to achieve this objective. New powerful decomposition techniques were presented, which improves performance up to 2.5 times over the previous version. A natural behavior technology is implemented using those techniques.

LGS 2.1 introduces a new feature linking help parameters of curve constraints to variables in the same way as the parameter of dimensional constraints. Those parameters can now be used in engineering equations defined by the user. As an example, several objects can be tangent to a curve at the same point (that is not guaranteed when using coincident constraints).

Important news is that 2.1 version LGS solver is available in both 32-bit and 64-bit versions for Windows and Linux platforms. With the new LGS version CAD/CAM/CAE software developers and their customers can exploit all benefits of 64-bit technology.

About LGS 2D

The LGS 2D geometric solver is a computational module, engineered to support two-dimensional parametric design in CAD and computer graphics systems, as well as many other applications that require parametric connections or constraints to be set between geometrical objects.

LGS 2D supports creation and modification of the geometric models by means of (explicit or implicit) constraints. Typical geometric objects are points, lines, circles, or arbitrary curves. Objects can be fixed in an absolute coordinate system or with respect to each other (the latter feature is provided by the 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 2D moves and rotates objects to positions where all constraints are satisfied trying to perform minimal possible transformations of initial configuration.

LGS 2D is a cross-platform software. It is a set of libraries that runs under all Windows, Linux, *BSD, AIX and other OS. Written in C++, LGS has a C-based API that allows integrating it into a broad range of software applications (even not written in C/C++). LGS 2D can be used as a self-supporting component, or jointly with 3D version. As a successor of 2D version, LGS 3D 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 APIs, 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


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:


LEDAS Sales and Marketing Department
Phone: +7 383 3356 504
fax: +7 383 3356 256

LGS is a trademark of LEDAS Ltd. Other trademarks belong to their respective holders.

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