http://www.cais.com/ (World Wide Web Directory, ~04/1995)
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Parent Directory 13-Apr-95 10:31 -
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356parts/ 27-Apr-95 10:48 -
Federal_Highway_Admin> 27-Apr-95 07:33 -
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INDEX 11-Feb-94 17:40 1K
MAIN3.f.hqx 21-Apr-95 12:37 50K
Mosaic/ 18-Mar-95 13:51 -
TrueGrid/ 23-Apr-95 17:39 -
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advbool/ 21-Jan-95 10:12 -
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arthor/ 30-Apr-95 12:26 -
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chas/ 29-Apr-95 10:52 -
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cti/ 10-Apr-95 17:38 -
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cyberdrv.zip 24-Mar-95 09:18 7K
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dante/ 13-Mar-95 17:53 -
dc-online/ 28-Apr-95 13:39 -
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yingko/ 27-Mar-95 00:48 -
zarnoff/ 29-Apr-95 20:34 -
TrueGrid's Support For IGES
TrueGrid defines a new standard of support for IGES data
imported from a CAD/CAM or Solids Modeling system.
Geometry can be directly imported to TrueGrid to create
a mesh without any geometry clean up. This is possible
because TrueGrid uses the projection method to place the
mesh directly onto the 3D geometry, without regard to the
parametric representation of the curves and surfaces of
the IGES.
TrueGrid is used throughout the structural and aerospace
industries, importing IGES files from almost every
CAD/CAM and Solids Modeling on the market. To quote one
TrueGrid user, other codes "... only dream of reading
IGES the way TrueGrid can read IGES". Many institutions
depend on TrueGrid to import and use IGES, such as
Boeing, Lawrence Livermore National Laboratory, Clorox,
Science Applications International, Hunting Engineering,
ICF Kaiser International, Owens_Corning, Caterpillar,
SOLAR Turbines, ALCOA, Reliance Electric, U.S. Navy,
Department Of Transportation, Army Corp Of Engineers, and
others. IGES data is commonly imported into TrueGrid from
CATIA, Pro/ENGINEER, ICEM/DDN, Computervision, AUTOCAD,
Unigraphics CADDS 4x, Unigraphics II, ANSYS, and HP
ME10/ME30. Note that these names are registered
trademarks of the respective companies.
Support for trimmed surfaces, which was added at the
beginning of 1994, has improved TrueGrid's ability to
combine many surfaces of all types into composite
surfaces. This unique feature makes it possible to
project a region of the mesh seamlessly across many
surfaces. Compare this to other mesh generators which
would require that each trimmed surface be manually
decomposed into simple 4-sided patches so that each patch
can become the face of a simple block mesh.
The latest version of TrueGrid, version 1.2.4, now
supports copious data. This is typically used to import
crude polygonal line data, imported from a digitizer
through AUTOCAD.
Another new feature in TrueGrid is the ability to form a
3D curve at the intersection of two surfaces. The
surfaces can be of any type. For instance, one of the
surfaces could be the composition of many trimmed
surfaces that meet tangentially at filets. The second
surface could be a polygon surface, possibly a material
interface extracted from a previous FEM simulation or
from digitized data.
TrueGrid is tolerant of numerical errors in the IGES
data. A CAD/CAM system or Solids Modeler may create two
surfaces that do not meet properly. When these two
surfaces are combine into a composite surface, a region
of the mesh can be projected onto the composite without
difficulty. An edge of the mesh can be automatically
placed along the intersection of two surfaces. If the two
surfaces do not meet perfectly, TrueGrid will extend the
surfaces a short distance in the tangential direction to
determine the intersection.
Other entities supported by TrueGrid are: circles,
composite curves, conic arcs, planes, lines, parametric
spline curves and surfaces, ruled surfaces, tabulated
cylinders, transformations, NURB curves and surfaces,
offset curves and surfaces, levels, and associative
groups.
http://www.cais.com/ (World Wide Web Directory, ~04/1995)