Apr 30, 2011

LEDAS Drastically Improves Performance of its LGS 3D Constraint Solver

Version 5.0 introduces new functions, improves speed by 30-100%.

LEDAS Ltd today announced the availability of version 5.0 of LGS 3D, its powerful geometric constraint solver. As a core technology component of CAD/CAM/CAE software, LGS 3D is used to implement geometric, dimensional, and engineering constraints in applications involving assembly design, motion simulation, and direct modeling.

Version 5.0 improves on its performance, introduces several new functions requested by LEDAS customers, and enhances the quality of its solutions.
Improved Performance

The move-under-constraints function allows users to drag one or more geometric objects interactively, while LGS 3D solves the constraints dynamically at each intermediate step. This makes it easy for users to adjust their designs, and to explore the kinematics of complex mechanisms. The new algorithm for adaptive calculation of move-under-constraints in LGS 3D 5.0 speeds up this function by 100%, on average.

LGS 3D can deal with inconsistent problems, and with version 5.0 inconsistent models are processed 30% faster on average, thanks to minimizing of the number of iterations to solve.
Extended Functions

In some design contexts, users need to know whether a particular constraint is satisfied. In previous releases, the only way to do this was to run the LGS 3D solver procedure, which proved to be time-consuming for large models. Version 5.0 introduces new functions that very quickly check if one or all constraints are satisfied.

The tangency constraint between cylinders and tori now supports the orientation attribute. Version 5.0 of LGS 3D now automatically detects the orientation attribute for coincidence constraints between circles and tori.

The distance constraint between two spheres now supports user- and application-defined help points. This allows users to measure distances between different combinations of the spheres’ sides.
Enhanced Solution Quality

The scope of some problem decomposition and heuristic methods has been extended to support models with non-rigid objects and variables.

The DOF (degrees of freedom) analysis introduced with the previous version of LGS 3D has been improved in version 5.0. The number of spiraling DOFs is minimized whenever possible.

LEDAS developers also eliminated several bugs reported by customers.