Scanners to Nurb

8/3/2019 Scanners to Nurb

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Physical Digital - Physical

Paul Deyo

Autodesk

Session ID: MA105-2P

Title: Physical-Digital-Physical

Integrating the physical world in your design process.

Abstract: Barriers to mastering the use of physical objects in your design process are

quickly falling as access to 3D scanners and rapid prototyping resources

expand. This class will provide an initiation into scanning technology and

how resulting 3D data is integrated with design processes. Real world

examples will be used to illustrate timesaving and quality enhancing

capabilities.

Topics include:

3D scanner technology and output

Industrial design solutions using scan data

Using 3D scan data in AliasStudio for visualization, modeling and

rapid prototyping

Creating rapid prototyping output

Speakers: Paul Deyo

Level: Advanced

Session Length: 90-Minute Class

About the Speaker:

Paul has over 28 years experience in transportation and industrial design. He has been involved in reverse engineeringtechnologies since working at General Motors in the 1990s where he was involved in developing scan processingsystems. Paul was involved in the development of three reverse engineering programs. He has experience in allphases of reverse engineering including scan processing, visualization and Class A surfacing. He is currently a productdesigner on the Alias team focusing on modeling.


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These are data representations at different stages in the process from physical object to final

CAD model. Of course the ultimate goal is the manufactured product which in some cases may

skip some of these stages. The point cloud has limited value but may be all that is required for

many metrology applications. Sparse point selection from Coordinate Measuring Machines can

be replaced by richer color error maps that provide information on deviation trends that may not

be clear from a small set of points.

With the polygonal mesh there are a much wider range of alternatives for engineering and

design development. The polygonal mesh can be used to reduce the lead time in toolingdevelopment by providing a close representation for roughing or packaging development.

Interference checking with assemblies can indicate design changes at an earlier stage. With a

properly developed mesh the model can be used for aerodynamic and mold flow studies.

The polygonal mesh can create photo realistic images useful in marketing studies. The mesh

allows dispersed teams to share a 3D representation of the physical model.

Finally the mesh can be manipulated to enhance and iterate the design further as well as

optimize the form as a Class A NURBS representation.


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Tools for capturing the data range in price from a few thousand to hundreds of thousands. The

cost of the hardware is only part of the price. Consideration should be given to the overall

process since the hardware cannot stand alone. A complete system will include a method of

registration, capturing the scan and extracting the available points in a cohesive point cloud.

Consideration for the amount of scanning required at one site may lead to partnering with a

service bureau that is dedicated to scanning.

Some hardware vendors supply a method for converting the point cloud to polygons. There are

a number of software packages capable of converting the point cloud to a water tight polygonal

mesh. These include packages from Raindrop GeoMagic, Innovmetric and RapidForm amongst

others. The conversion to polygonal mesh will eliminate any problems typical of the scan

process such as removing registration targeting and filling in holes. Depending on the scanning

method smoothing and reduction may also help make the polygonal mesh easier to work with.

Fast conversion of the mesh to a NURBS representation may be required if the downstream use

cannot utilize a polygonal mesh.


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RegistrationScans can be aligned to design space with

established coordinate markers or aligned with

existing design data based on key reference

points or best fit to surface data.

Demonstration

Polygon clean up and preparation

With the mesh positioned it can be optimized for

visualization by reduction, smoothing and hole

filling. Portions of the model can be cut cleanly

to establish part breakup. Shaders are applied

and the model is introduced into an environment.

Demonstration

Shape Modification

Polygonal meshes lend themselves well to

modification with Dynamic Shape Modification.This can be used aesthetically to provide design

iterations, conform to engineering requirements

or match a mesh to existing NURBS data.

Demonstration


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Hybrid Modeling

NURBS data can be integrated with the

polygonal data to create details and provided

quick prototypes. The converted NURBS are

then stitched into a cohesive mesh, thicked and

output for Rapid Prototyping.

Demonstration

Rapid Prototyping

The polygonal model must satisfy the

requirements of the rapid prototyping machine

used to create the new part. The Mesh Repair

tool is used to identify and correct issues with the

mesh. Once it passes these tests the mesh will

offset to create a watertight mesh.

Demonstration

Nurbs modeling

The polygonal model is a perfect reference for

development of a NURBS model. The NURBS

model may be a refinement of the originaldesign with greater attention to shape and

engineering requirements. Rapid surfacing

methods such as those available in Raindrop

GeoMagic may generate NURBS for

downstream processes that cannot utilize

polygonal data.

Demonstration


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Contributors

Service Bureaus

www.3shape.com

www.arius3d.com

www.bolton-works.com

www.capture3d.com

www.CGIinspect.com

www.dynamicdatagroup.com

Software Vendors

www.geomagic.com

www.pointools.com

Scanner Vendors

www.arius3d.com

www.cyberware.com

www.zcorp.com

www.polhemus.com

www.nextengine.com

www.laserdesign.com

www.3ddigitalcorp.com

www.steinbichler.de

www.gom.com

www.leica-geosystems.com

www.CGIinspect.com

Additional Resources

http://www.simple3d.com/

http://www.wohlersassociates.com/

http://vr.isdale.com
http://www.arius3d.com/http://www.bolton-works.com/http://www.dynamicdatagroup.com/http://www.geomagic.com/http://www.arius3d.com/http://www.cyberware.com/http://www.zcorp.com/http://www.polhemus.com/http://www.nextengine.com/http://www.laserdesign.com/http://www.steinbichler.de/http://www.cyberware.com/http://www.cyberware.com/http://www.polhemus.com/http://www.simple3d.com/http://www.wohlersassociates.com/http://www.wohlersassociates.com/http://www.simple3d.com/http://www.polhemus.com/http://www.cyberware.com/http://www.cyberware.com/http://www.steinbichler.de/http://www.steinbichler.de/http://www.laserdesign.com/http://www.nextengine.com/http://www.polhemus.com/http://www.zcorp.com/http://www.cyberware.com/http://www.arius3d.com/http://www.geomagic.com/http://www.dynamicdatagroup.com/http://www.bolton-works.com/http://www.arius3d.com/

Documents

Scanners to Nurb