© 2011 Autodesk Automotive Surfacing Techniques with Autodesk ® Alias ® Surface Nils Kremser...

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Automotive Surfacing Techniqueswith Autodesk® Alias® SurfaceNils KremserMajor Accounts Automotive - Subject Matter Expert

Introduction & Agenda

1 10:15–10:30“Automotive Shapes”

What is different here?

2 10:30–10:50Transitions & Continuity

Terms and Differences

3 10:50–11:00Surface Quality

Criteria

4 11:00–11:25Automotive Surfacing Techniques

Workflow demonstration: Which tools are necessary?

5 11:25–11:30Q&A

Discussion

Automotive Shapes

Car Exteriors

Car Interiors

„Automotive“ shapes

What does „Freeform surface“ mean?

source: Wikipedia: “Freeform surface modeling”source: Wikipedia: “Freeform surface modeling”

„Floating“ Shapes

For Floating

Highlights

You need Perfect Transitions

Transitions & Continuity

Explaining terms: Radius Comb

Radius plot: large radius = long comb

Explaining terms: Curvature

Curvature plot: large curvature = long comb

Transitions & ContinuityEXAMPLE

Transitions

CAD Industrial Design ID / Automotive

Tangent Curvature G3 continuity

CAD vs. Design shapes

Surface Quality

Surface quality criteria

1. Number of Control Points: Fewer = Better!

3 point 4 points× 6 points ×

1. Number of Control Points

2. CV distribution

Proportional distances non-proportionally distances ×

All CVs follow positive shape CV does not follow positive shape ×

2. Logical CV distribution

3. Internal G3 continuity (rate of change of curvature)

Internal G3 continuity Internal G3 break ×

2. Logical CV distribution

3. Internal G3 continuity (rate of change of curvature)

4. Extendable

extendable not extendable ×

Single Surface:

1.Surface should be smooth: use just as few control points as needed!

2.Logical distribution of control points

3.Harmonic rate of change of curvature (internal G3 continuity)

4.Extendable

Multiple Surfaces:

1.Highlights: surface transitions in required quality (depending on size and material)

Surface Quality

Without Surface Quality emotions don‘t work!

Automotive Surfacing Techniques

Modeling Workflow

Interior Data courtesy of EDAG

Modeling Workflow

From Scan to Sections… … to centerline curves…

… creating quickly surfaces

EXAMPLE

Which Modeling Tools are needed?

1. Basic curve & surface creation and modification tools

(draft / flange, square / rail / profile, revolve)

1. Basic curve & surface creation and modification tools

2. Modifying control points

- move not only in x,y,z …

2. Modifying control points

- move not only in x,y,z

but also

- in normal direction

- slide along the hull curves (tangents)

with lockable step size

3. Align (matching surfaces)

4. Fillet and Freeform Blend (with form factor)

Which Tools to analyse and diagnose are needed?

5. Managing sections and planes

(x,y,z and radial sections,

„true“ / normal section,

interactive sections etc.)

6. Diagnostics

- Diagnostic Shaders (Zebra, iso-angle, Gauss etc.)

- Highlight and Parting line analysis

7. Visualization

- photorealistic

- but also

technical

(for design reviews,

shutline discussions

Which Modeling Tools are needed - Summary

1. Curve & surface creation

2. Control point modification

3. Align (matching surfaces)

4. Sections and plane manager

5. Fillets / Blends

6. Diagnostics

7. Visualization

Learning Objectives

At the end of this class, you will be able to:

understand better what is special in Automotive modeling

explain what “freeform surfaces” are

describe criteria for surface quality

describe different levels of surface continuity

know why a regular CAD system is not a sufficient tool for Automotive modeling

which modeling tools & features are needed

Thank you

Any questions?

Autodesk, AutoCAD* [*if/when mentioned in the pertinent material, followed by an alphabetical list of all other trademarks mentioned in the material] are registered trademarks or trademarks of Autodesk, Inc., and/or its subsidiaries and/or affiliates in the USA and/or other countries. All other brand names, product names, or trademarks belong to their respective holders. Autodesk reserves the right to alter product and services offerings, and specifications and pricing at any time without notice, and is not responsible for typographical or graphical errors that may appear in this document. © 2011 Autodesk, Inc. All rights reserved.

© 2011 Autodesk Automotive Surfacing Techniques with Autodesk ® Alias ® Surface Nils Kremser...

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