UGS NX (Unigraphics) (Windows only)
 
 
 

Alias UGS NX DirectConnect is a stand-alone utility that allows the exchange of 3D model data between Alias and UGS NX.

UGS NX Requirements

Before you create the model

  • Set units to mm.

In the Construction Settings window:

  • The Rational geometry flag can be toggled OFF.

Set tolerances as follows:

  • Curve Fit Distance = .01 mm (lower as necessary)
  • Curve Fit Checkpoints = 10
  • Max Gap Distance = .01 mm (this value should remain the same as Curve Fit Distance)
  • Trim Curve Fit =.005 mm (lower as necessary)

While you create the model

  • Use degree 5 curves and surfaces to achieve curvature continuity between surfaces and successful data transfer.
  • Periodically transfer models from Alias to UGS NX during construction to manage the quality of the model being created.
  • Stitch the Alias model successfully before export, but also periodically stitch the geometry to ensure that the model meets all tolerance requirements.
  • Avoid using Object Edit > Attach > Attach since this tool creates multiknots in Alias geometry.
  • Avoid using Surfaces > Skin between trimmed surface boundaries, since excessive amounts of data are created in the resulting surface. If Skin is used between trim boundaries, check the resulting surfaces for multiknots before export.
  • Use surface building tools such as Surfaces > Boundary Surfaces > Square and Surfaces > Swept Surfaces > Rail Surface to ensure and control curvature continuity between surfaces.

Workflow

Before transferring geometry between Alias and UGS NX, consider the purpose of the transfer to plan an appropriate workflow.

Two common workflows are:

There are many variations on these two examples. Whatever the transfer scenario, carefully plan the transfer process, to ensure that the appropriate data is written out and is useful.

Detailed file format information

UGS NX (Unigraphics) part and assembly format (Windows only)