This is due to a number of factors, but some of the common factors seems to be the following: As for UG, which I am a long time UG user myself, it does seem to be fading away. SolidWorks ctopher (Mechanical) 18 Feb 10 23:44 API VB programming help RE: Unigraphics NX vs.

Honesty may be the best policy, but insanity is a better defense. This made it possible to work on very large models that had very small details without unravelling. UG allowed access to the tolerance parameters of the parasolid kernel. UG could handle cutting and pasting swatches of large models and still recognize organic faces as the same, so boolean operations would knit with no patches. This was essential, as most of the input surfaces were 5th degree in one direction and 3rd degree in the other, and we HAD to match. B-surface degree definition could be changed in both u- and v-directions. Users had full access to knot points and poles. Surface definitions could be changed by the defining points. The ability to move, delete, resize, and replace faces was good enough to handle most of the changes.

There are tools in the UG toolbox that make it possible to manage such things without the need for parametric modelling. The integrity of the boundary definitions of these models made it so that knit surfaces would come apart at the seams like a fat man's shirt buttons. We needed to work from models that were generated in Alias and Vellum. Design inputs came from industrial designers who absolutely ruled the roost. I worked with UG in an environment where it was near-impossible to keep up with changes using parametric modelling.

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