rhino_Autodesk-inventor_a4.pdf

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Advanced Surface Modeling
for Inventor
Rhinoceros
NURBS modeling for Windows
®
Rhinoceros: Advanced Surface Modeling for Inventor
Advanced Surface Modeling
With Rhino you can enhance the modeling features of Inventor in several important
ways. You can:
•
Create advanced, free-form surfaces
Free-form surface.
•
Import and Fix IGES files
Badly trimmed IGES file.
•
•
Translate 3-D data between applications
Edit 3-D data from diverse sources
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Rhinoceros: Advanced Surface Modeling for Inventor
Create Advanced Free-form Surfaces
Rhino can be used to create very accurate, free-form surface and solid models for
import into Inventor. These models can be used as base parts or reference geometry.
Modeling in Rhino is different from modeling in Inventor and other parametric,
feature-based modelers. In Inventor, you start with a sketch or body feature and then
add features to create a command history tree. Rhino does not maintain a command
history tree and has no parametric features. This frees you to work directly with solids,
curves, and advanced surfaces without regard for command history or embedded
sketches. Curves are used to make surfaces. Surfaces are created, trimmed, matched,
evaluated, and if desired, joined into open or closed polysurfaces. Rhino supports a
host of curve and surface editing tools including Boolean operations on both open and
closed polysurfaces.
A closed polysurface defines a volume and can be exported as an IGES, STEP, ACIS
(.sat), or Parasolid (.x_t) files. ACIS files from Rhino can be imported into Inventor as
parts.
Cross-Trainer Shoe Midsole
This cross-trainer midsole was modeled in Rhino. The surfaces were joined and the
resulting closed polysurfaces were exported as solids in a SAT file. They were then
opened in Inventor as a part.
Midsole in Rhino.
Midsole Assembly in Inventor.
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Rhinoceros: Advanced Surface Modeling for Inventor
Automobile Fender
The following car fender was designed and built in Rhino. In this example the main
body of the fender and the lip are to be joined with a special surface between them.
This surface must have curvature (G2) continuity with the adjacent surfaces to avoid
visual seams in reflections. Rhino features high-end, feature-rich, surface modeling
and evaluation tools, including position, tangency, and curvature matching as shown
in the following example.
This surface is created from a curve network.
The NetworkSrf command is used in this case. The edges of the adjacent surfaces and
previously drawn profile curves are selected as input for the command. The profile
curves indicate the desired surface shape to the command. The surface edges labeled
B and D have been designated for curvature (G2) matching. G2 curvature indicates
the second derivative of the surface curves is equal at those edges. This ensures that
there will be no visible seam in reflections on this fender.
The resulting surface.
The following images illustrate a few of several surface quality analysis tools in Rhino.
Notice the smooth transition from one surface into the next without visible line breaks
in the reflection. This indicates G2 curvature continuity.
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Rhinoceros: Advanced Surface Modeling for Inventor
Environment mapping used for surface analysis.
Curvature analysis shows the curvature values of the surface in color.
Zebra analysis shows the continuity of the surfaces.
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