Free Solidworks 2009 Full Version DOWNLOAD. Tustin High School is a public high school located in Orange County in the city of Tustin, California, United States.The school's mascot is the Tiller.Tustin High is a part of Tustin Unified School District and was originally established in 1921 as Tustin Union High School.

Bonjour is Apple's implementation of zero-configuration networking (zeroconf), a group of technologies that includes service discovery, address assignment, and hostname resolution. Bonjour locates devices such as printers, other computers, and the services that those devices offer on a local network using multicast Domain Name System (mDNS) service records.

The software comes built-in with Apple's macOS and iOS operating systems. Bonjour can also be installed onto computers running Microsoft Windows. Bonjour components may also be included within other software such as iTunes and Safari.

After its introduction in 2002 with Mac OS X 10.2 as Rendezvous, the software was renamed in 2005 to Bonjour following an out-of-court trademark dispute settlement.^[1][2]

• 5Browsers

Overview[edit]

Bonjour provides a general method to discover services on a local area network. The software is widely used throughout macOS, and allows users to set up a network without any configuration. As of 2010 it is used to find printers and file-sharing servers. Examples of applications using Bonjour:

• iTunes to find shared music
• iPhoto to find shared photos
• iChat, Adobe SystemsCreative Suite 3, Proteus, Adium, Fire, Pidgin, Skype, Vine Server, and Elgato EyeTV to communicate with multiple clients
• Gizmo5 to find other users on the local network
• TiVo Desktop to find digital video recorders and shared-media libraries (deprecated, unsupported c. 2013)
• Adtec Digital Used to quickly find configure media players, video encoders and video receivers
• SubEthaEdit and e to find document collaborators
• Contactizer to find and share contacts, tasks, and events information
• Solidworks and PhotoView 360 used for managing licenses
• Things & OmniFocus to synchronize projects and tasks across the Mac desktop and the iPad, iPhone or iPod touch
• Safari to find local web servers and configuration pages for local devices
• Asterisk to advertise telephone services along with configuration parameters to VoIP phones and dialers.

Software such as Bonjour Browser or iStumbler, both for macOS, or Zeroconf Neighborhood Explorer for Windows, can be used to view all services declared by these applications. Apple's 'Remote' application for iPhone and iPod Touch also uses Bonjour to establish connection to iTunes libraries via Wi-Fi.^[3]

Bonjour only works within a single broadcast domain, which is usually a small area, without special DNS configuration. macOS, Bonjour for Windows and AirPort Base Stations may be configured to use Wide Area Bonjour which allows for wide area service discovery via an appropriately configured DNS server.

Applications generally implement Bonjour services using standard TCP/IP calls, rather than in the operating system. Although macOS provides various Bonjour services, Bonjour also works on other operating systems. Apple has made the source code of the Bonjour multicast DNS responder, the core component of service discovery, available as a Darwinopen source project. The project provides source code to build the responder daemon for a wide range of platforms, including Mac OS 9, macOS, Linux, *BSD, Solaris, VxWorks, and Windows. Apple also provides a user-installable set of services called Bonjour for Windows and Java libraries. A number of Windows programs use zeroconf, including Adtec Digital, Adobe SystemsCreative Suite 3, iTunes, Cerulean Studios' Trillian Pro 3, Ruckus Music Player from Ruckus Network, and the text editor e.

Licensing[edit]

Bonjour is released under a terms-of-limited-use license by Apple. It is freeware for clients, though developers and software companies who wish to redistribute it as part of a software package or use the Bonjour logo may need a licensing agreement. The source code for mDNSResponder is available under the Apache License.^[4]

Naming[edit]

Apple originally introduced the Bonjour software in August 2002 as part of Mac OS X 10.2 under the name 'Rendezvous'. On August 27, 2003 Tibco Software Inc announced that it had filed a lawsuit for trademark infringement.^[5]Tibco had an enterprise application integration product called TIBCO Rendezvous on the market since 1994 and stated that it had tried to come to an agreement with Apple Computer. In July 2004 Apple Computer and Tibco reached an out-of-court settlement;^[6] specifics of the settlement were not released to the public. On April 12, 2005, Apple announced the renaming of Rendezvous to 'Bonjour'.^[1]

The current name Bonjour is French for the morning or afternoon greeting, 'good day'. The previous name Rendezvous is French for 'meeting', 'appointment' or 'date'.^[7]

Other implementations[edit]

Bonjour version 2.0, released on February 24, 2010, works with Microsoft Windows 2000, 2003, XP, Vista, 7, 8, and 10.^[8] Systems use it primarily to facilitate the installation, configuration, and use of network printers, and thus it runs from startup. When Bonjour is fully implemented on Windows, some features—such as iChat—allow for communication between Windows and Mac OS. Bonjour for Windows also adds zeroconf capabilities to Internet Explorer, and provides a zeroconf implementation to Java VMs.^[8][9]

Some third-party applications, such as Adobe's Photoshop CS3 suite,^[10]also come bundled with Bonjour to take advantage of zeroconf technology.

Installers on Windows systems normally place Bonjour files in a folder called 'Bonjour' within the 'Program Files' folder. It modifies Windows system-registry entries related to internal network configuration and operation. Bonjour runs as mDNSResponder.exe. Communications across the network take place over UDP port 5353, which may require reconfiguring some personal or corporate firewalls that block Bonjour packets. A full installation of Bonjour for Windows will include a plug-in for Internet Explorer, a printer wizard, and the network communication services. Not all components are included when installed as part of a third-party application or as a component of other Apple software such as iTunes.

Some VPN clients are configured so that local network services are unavailable to a computer when VPN software is active and connected.^[8] In such a case no local zeroconf services are available to Bonjour or any other zeroconf implementation.

In September 2008, two security vulnerabilities were found in Bonjour for Windows.^[11]Certain installations of Bonjour for Windows lack an uninstaller and do not display a human-readable entry in the Windows services listing.^[12]

In 32- and 64-bit releases of Windows 7, some older but still available versions of Bonjour services can disable all network connectivity by adding an entry of 0.0.0.0 as the default gateway. This was a bug reported in 2013.^[13]

The open-source IM clients Pidgin, Kopete and Adium support the Bonjour IM protocol, as does the non-GPL Trillian client.

Browsers[edit]

A number of browsers allow an end-user to graphically explore the devices found using Bonjour.

Bonjour Browser[edit]

Bonjour Browser is a Creative Commons licensed macOS application that displays all services declared using Bonjour. The program was originally called 'Rendezvous Browser', but changed its name in version 1.5.4 after Apple changed the protocol's name to Bonjour. For certain protocols, double clicking a list item will launch the associated helper. 1.5.6 is the first universal binary version.

Future versions will allow users to completely define a service, instead of relying on the author to do so.

Bonjour Browser was recommended for service discovery in MacAddict #123.

JBonjourBrowser[edit]

A student research project at Columbia University produced a Java-based system to match the functionality of Bonjour Browser, called JBonjourBrowser. JBonjourBrowser is open-source and available under the GPL.

JBonjourBrowser was built to emulate the functionality of Bonjour Browser, and at the same time work on multiple platforms. It requires Apple's Bonjour Java library to run.

Bonjour Browser for Windows[edit]

A native Windows application offers similar functions to Bonjour Browser for Mac OS. Bonjour Browser for Windows is offered for free by Hobbyist Software and HandyDev Software.

mDNSBrowser[edit]

A commercial implementation called mDNSBrowser is offered by Netputing Systems Inc.

See also[edit]

• PostgreSQL database supports Bonjour
• Bonjour Sleep Proxy service^[14]
• Universal Plug and Play – provides discovery functionality similar to Bonjour among other things
• WS-Discovery – a technical specification that defines a multicast discovery protocol to locate services on a local network.

References[edit]

1. ^ ^abMarc Krochmal (April 12, 2005). 'Rendezvous is changing to...'rendezvous-dev mailing list. Apple Computer. Archived from the original on March 19, 2007. Retrieved October 11, 2006.
2. ^'Apple to rename Rendezvous technology 'Bonjour''. appleinsider.com. February 18, 2005. Retrieved March 14, 2015.
3. ^'Android DACP Remote Control'. Android DACP Remote Control. Jeffrey Sharkey. Retrieved February 23, 2009.
4. ^'mDNSResponder source code'. Apple. File 'LICENSE' within each mDNSResponder source code download.
5. ^'TIBCO Software Inc. Sues Apple Computer, Inc. for Trademark Infringement' (Press release). TIBCO Software. August 27, 2003. Retrieved October 11, 2006.
6. ^Daniel Drew Turner (July 22, 2004). 'Apple Settles TIBCO Suit, Renames Rendezvous'. eWeek. Retrieved October 11, 2006.
7. ^'bonjour'. merriam-webster.com. Retrieved July 28, 2010.
8. ^ ^abc'Bonjour Downloads'. Apple Inc. March 8, 2010. Retrieved March 8, 2010.
9. ^Apple Inc. 'Leopard Sneak Peek – iChat'. Archived from the original on November 27, 2006. Retrieved November 28, 2006.
10. ^'CS3 Doesn't Install Spyware'. Adobe Systems. January 4, 2007. Retrieved February 7, 2009.
11. ^'About the security content of Bonjour for Windows 1.0.5'. Apple Inc. September 15, 2008. Retrieved May 27, 2009.
12. ^'Completly [sic] Uninstall and Remove Bonjour Service and Files (mDNSResponder.exe, mdnsNSP.dll) for Windows'. Amarjeet Rai. February 11, 2008. Retrieved July 5, 2009.
13. ^'Windows 7 - Two default gateway 0.0.0.0'. microsoft.com. Retrieved April 22, 2012.
14. ^'Mac OS X v10.6: About Wake on Demand (Apple Article HT3774)'. Apple. August 27, 2009. Retrieved September 15, 2009. Setting up Wake on Demand', 'Setting up a Bonjour Sleep Proxy

External links[edit]

• DNS SRV (RFC 2782) Service Types - List of officially registered Bonjour service types
• Bonjour - Networking, simplified - General information from Apple
• Bonjour developer website - Developer resources from Apple
• Apple - Support - Bonjour - Bonjour support from Apple
• Bonjour: The official Bonjour site on Mac OS Forge.
• Zeroconf - site with myriad useful links maintained by Stuart Cheshire
• Hour-long talk by Stuart Cheshire on Google Talks about Bonjour and zeroconf (November 2, 2005)
• Bonjour Browser for Windows - Bonjour Browser for Windows
• Understanding Zeroconf and Multicast DNS - An introduction to zero configuration networking, including a comparison between Bonjour/zeroconf and Universal Plug 'n' Play

3D scanning is the process of analyzing a real-world object or environment to collect data on its shape and possibly its appearance (e.g. colour). The collected data can then be used to construct digital 3D models.

A 3D scanner can be based on many different technologies, each with its own limitations, advantages and costs. Many limitations in the kind of objects that can be digitised are still present. for example, optical technology may encounter many difficulties with shiny, reflective or transparent objects. For example, industrial computed tomography scanning and structured-light 3D scanners can be used to construct digital 3D models, without destructive testing.

Collected 3D data is useful for a wide variety of applications. These devices are used extensively by the entertainment industry in the production of movies and video games, including virtual reality. Other common applications of this technology include augmented reality,^[1]motion capture,^[2][3]gesture recognition,^[4], robotic mapping,^[5]industrial design, orthotics and prosthetics,^[6]reverse engineering and prototyping, quality control/inspection and the digitization of cultural artifacts^[7].

• 2Technology
  • 2.2Non-contact active
  • 2.6Volumetric techniques
  • 2.7Non-contact passive
• 3Reconstruction
• 4Applications
  • 4.9Cultural heritage

Functionality[edit]

The purpose of a 3D scanner is usually to create a 3D model. This 3D model consists of a point cloud of geometric samples on the surface of the subject. These points can then be used to extrapolate the shape of the subject (a process called reconstruction). If colour information is collected at each point, then the colours on the surface of the subject can also be determined.

3D scanners share several traits with cameras. Like most cameras, they have a cone-like field of view, and like cameras, they can only collect information about surfaces that are not obscured. While a camera collects colour information about surfaces within its field of view, a 3D scanner collects distance information about surfaces within its field of view. The 'picture' produced by a 3D scanner describes the distance to a surface at each point in the picture. This allows the three dimensional position of each point in the picture to be identified.

For most situations, a single scan will not produce a complete model of the subject. Multiple scans, even hundreds, from many different directions are usually required to obtain information about all sides of the subject. These scans have to be brought into a common reference system, a process that is usually called alignment or registration, and then merged to create a complete 3D model. This whole process, going from the single range map to the whole model, is usually known as the 3D scanning pipeline.^[8]

Technology[edit]

There are a variety of technologies for digitally acquiring the shape of a 3D object. A well established classification^[9] divides them into two types: contact and non-contact. Non-contact solutions can be further divided into two main categories, active and passive. There are a variety of technologies that fall under each of these categories.

Contact[edit]

Contact 3D scanners probe the subject through physical touch, while the object is in contact with or resting on a precision flatsurface plate, ground and polished to a specific maximum of surface roughness. Where the object to be scanned is not flat or can not rest stably on a flat surface, it is supported and held firmly in place by a fixture.

The scanner mechanism may have three different forms:

• A carriage system with rigid arms held tightly in perpendicular relationship and each axis gliding along a track. Such systems work best with flat profile shapes or simple convex curved surfaces.
• An articulated arm with rigid bones and high precision angular sensors. The location of the end of the arm involves complex math calculating the wrist rotation angle and hinge angle of each joint. This is ideal for probing into crevasses and interior spaces with a small mouth opening.
• A combination of both methods may be used, such as an articulated arm suspended from a traveling carriage, for mapping large objects with interior cavities or overlapping surfaces.

A CMM (coordinate measuring machine) is an example of a contact 3D scanner. It is used mostly in manufacturing and can be very precise. The disadvantage of CMMs though, is that it requires contact with the object being scanned. Thus, the act of scanning the object might modify or damage it. This fact is very significant when scanning delicate or valuable objects such as historical artifacts. The other disadvantage of CMMs is that they are relatively slow compared to the other scanning methods. Physically moving the arm that the probe is mounted on can be very slow and the fastest CMMs can only operate on a few hundred hertz. In contrast, an optical system like a laser scanner can operate from 10 to 500 kHz.^[10]

Other examples are the hand driven touch probes used to digitise clay models in computer animation industry.

Non-contact active[edit]

Active scanners emit some kind of radiation or light and detect its reflection or radiation passing through object in order to probe an object or environment. Possible types of emissions used include light, ultrasound or x-ray.

Time-of-flight[edit]

The time-of-flight 3D laser scanner is an active scanner that uses laser light to probe the subject. At the heart of this type of scanner is a time-of-flight laser range finder. The laser range finder finds the distance of a surface by timing the round-trip time of a pulse of light. A laser is used to emit a pulse of light and the amount of time before the reflected light is seen by a detector is measured. Since the speed of light${\displaystyle c}$ is known, the round-trip time determines the travel distance of the light, which is twice the distance between the scanner and the surface. If ${\displaystyle t}$ is the round-trip time, then distance is equal to ${\displaystyle c\cdot t/2}$. The accuracy of a time-of-flight 3D laser scanner depends on how precisely we can measure the ${\displaystyle t}$ time: 3.3 picoseconds (approx.) is the time taken for light to travel 1 millimetre.

The laser range finder only detects the distance of one point in its direction of view. Thus, the scanner scans its entire field of view one point at a time by changing the range finder's direction of view to scan different points. The view direction of the laser range finder can be changed either by rotating the range finder itself, or by using a system of rotating mirrors. The latter method is commonly used because mirrors are much lighter and can thus be rotated much faster and with greater accuracy. Typical time-of-flight 3D laser scanners can measure the distance of 10,000~100,000 points every second.

Time-of-flight devices are also available in a 2D configuration. This is referred to as a time-of-flight camera.^[11]

Triangulation[edit]

Triangulation based 3D laser scanners are also active scanners that use laser light to probe the environment. With respect to time-of-flight 3D laser scanner the triangulation laser shines a laser on the subject and exploits a camera to look for the location of the laser dot. Depending on how far away the laser strikes a surface, the laser dot appears at different places in the camera's field of view. This technique is called triangulation because the laser dot, the camera and the laser emitter form a triangle. The length of one side of the triangle, the distance between the camera and the laser emitter is known. The angle of the laser emitter corner is also known. The angle of the camera corner can be determined by looking at the location of the laser dot in the camera's field of view. These three pieces of information fully determine the shape and size of the triangle and give the location of the laser dot corner of the triangle.^[12] In most cases a laser stripe, instead of a single laser dot, is swept across the object to speed up the acquisition process. The National Research Council of Canada was among the first institutes to develop the triangulation based laser scanning technology in 1978.^[13]

Strengths and weaknesses[edit]

Time-of-flight and triangulation range finders each have strengths and weaknesses that make them suitable for different situations. The advantage of time-of-flight range finders is that they are capable of operating over very long distances, on the order of kilometres. These scanners are thus suitable for scanning large structures like buildings or geographic features. The disadvantage of time-of-flight range finders is their accuracy. Due to the high speed of light, timing the round-trip time is difficult and the accuracy of the distance measurement is relatively low, on the order of millimetres.

Triangulation range finders are exactly the opposite. They have a limited range of some meters, but their accuracy is relatively high. The accuracy of triangulation range finders is on the order of tens of micrometers.

Time-of-flight scanners' accuracy can be lost when the laser hits the edge of an object because the information that is sent back to the scanner is from two different locations for one laser pulse. The coordinate relative to the scanner's position for a point that has hit the edge of an object will be calculated based on an average and therefore will put the point in the wrong place. When using a high resolution scan on an object the chances of the beam hitting an edge are increased and the resulting data will show noise just behind the edges of the object. Scanners with a smaller beam width will help to solve this problem but will be limited by range as the beam width will increase over distance. Software can also help by determining that the first object to be hit by the laser beam should cancel out the second.

At a rate of 10,000 sample points per second, low resolution scans can take less than a second, but high resolution scans, requiring millions of samples, can take minutes for some time-of-flight scanners. The problem this creates is distortion from motion. Since each point is sampled at a different time, any motion in the subject or the scanner will distort the collected data. Thus, it is usually necessary to mount both the subject and the scanner on stable platforms and minimise vibration. Using these scanners to scan objects in motion is very difficult.

Recently, there has been research on compensating for distortion from small amounts of vibration^[14] and distortions due to motion and/or rotation.^[15]

When scanning in one position for any length of time slight movement can occur in the scanner position due to changes in temperature. If the scanner is set on a tripod and there is strong sunlight on one side of the scanner then that side of the tripod will expand and slowly distort the scan data from one side to another. Some laser scanners have level compensators built into them to counteract any movement of the scanner during the scan process.

Conoscopic holography[edit]

In a conoscopic system, a laser beam is projected onto the surface and then the immediate reflection along the same ray-path are put through a conoscopic crystal and projected onto a CCD. The result is a diffraction pattern, that can be frequency analyzed to determine the distance to the measured surface. The main advantage with conoscopic holography is that only a single ray-path is needed for measuring, thus giving an opportunity to measure for instance the depth of a finely drilled hole.^[16]

Hand-held laser scanners[edit]

Hand-held laser scanners create a 3D image through the triangulation mechanism described above: a laser dot or line is projected onto an object from a hand-held device and a sensor (typically a charge-coupled device or position sensitive device) measures the distance to the surface. Data is collected in relation to an internal coordinate system and therefore to collect data where the scanner is in motion the position of the scanner must be determined. The position can be determined by the scanner using reference features on the surface being scanned (typically adhesive reflective tabs, but natural features have been also used in research work)^[17][18] or by using an external tracking method. External tracking often takes the form of a laser tracker (to provide the sensor position) with integrated camera (to determine the orientation of the scanner) or a photogrammetric solution using 3 or more cameras providing the complete six degrees of freedom of the scanner. Both techniques tend to use infra redlight-emitting diodes attached to the scanner which are seen by the camera(s) through filters providing resilience to ambient lighting.^[19]

Data is collected by a computer and recorded as data points within three-dimensional space, with processing this can be converted into a triangulated mesh and then a computer-aided design model, often as non-uniform rational B-spline surfaces. Hand-held laser scanners can combine this data with passive, visible-light sensors — which capture surface textures and colors — to build (or 'reverse engineer') a full 3D model.

Structured light[edit]

Structured-light 3D scanners project a pattern of light on the subject and look at the deformation of the pattern on the subject. The pattern is projected onto the subject using either an LCD projector or other stable light source. A camera, offset slightly from the pattern projector, looks at the shape of the pattern and calculates the distance of every point in the field of view.

Structured-light scanning is still a very active area of research with many research papers published each year. Perfect maps have also been proven useful as structured light patterns that solve the correspondence problem and allow for error detection and error correction.[24] [See Morano, R., et al. 'Structured Light Using Pseudorandom Codes,'IEEE Transactions on Pattern Analysis and Machine Intelligence.

The advantage of structured-light 3D scanners is speed and precision. Instead of scanning one point at a time, structured light scanners scan multiple points or the entire field of view at once. Scanning an entire field of view in a fraction of a second reduces or eliminates the problem of distortion from motion. Some existing systems are capable of scanning moving objects in real-time. VisionMaster creates a 3D scanning system with a 5-megapixel camera – 5 million data points are acquired in every frame.

A real-time scanner using digital fringe projection and phase-shifting technique (certain kinds of structured light methods) was developed, to capture, reconstruct, and render high-density details of dynamically deformable objects (such as facial expressions) at 40 frames per second.^[20] Recently, another scanner has been developed. Different patterns can be applied to this system, and the frame rate for capturing and data processing achieves 120 frames per second. It can also scan isolated surfaces, for example two moving hands.^[21] By utilising the binary defocusing technique, speed breakthroughs have been made that could reach hundreds ^[22] to thousands of frames per second.^[23]

Modulated light[edit]

Modulated light 3D scanners shine a continually changing light at the subject. Usually the light source simply cycles its amplitude in a sinusoidal pattern. A camera detects the reflected light and the amount the pattern is shifted by determines the distance the light travelled. Modulated light also allows the scanner to ignore light from sources other than a laser, so there is no interference.

Volumetric techniques[edit]

Medical[edit]

Computed tomography (CT) is a medical imaging method which generates a three-dimensional image of the inside of an object from a large series of two-dimensional X-ray images, similarly Magnetic resonance imaging is another medical imaging technique that provides much greater contrast between the different soft tissues of the body than computed tomography (CT) does, making it especially useful in neurological (brain), musculoskeletal, cardiovascular, and oncological (cancer) imaging. These techniques produce a discrete 3D volumetric representation that can be directly visualised, manipulated or converted to traditional 3D surface by mean of isosurface extraction algorithms.

Industrial[edit]

Although most common in medicine, Industrial computed tomography, Microtomography and MRI are also used in other fields for acquiring a digital representation of an object and its interior, such as non destructive materials testing, reverse engineering, or studying biological and paleontological specimens.

Non-contact passive[edit]

Passive 3D imaging solutions do not emit any kind of radiation themselves, but instead rely on detecting reflected ambient radiation. Most solutions of this type detect visible light because it is a readily available ambient radiation. Other types of radiation, such as infra red could also be used. Passive methods can be very cheap, because in most cases they do not need particular hardware but simple digital cameras.

• Stereoscopic systems usually employ two video cameras, slightly apart, looking at the same scene. By analysing the slight differences between the images seen by each camera, it is possible to determine the distance at each point in the images. This method is based on the same principles driving human stereoscopic vision[1].
• Photometric systems usually use a single camera, but take multiple images under varying lighting conditions. These techniques attempt to invert the image formation model in order to recover the surface orientation at each pixel.
• Silhouette techniques use outlines created from a sequence of photographs around a three-dimensional object against a well contrasted background. These silhouettes are extruded and intersected to form the visual hull approximation of the object. With these approaches some concavities of an object (like the interior of a bowl) cannot be detected.

User assisted (image-based modelling)[edit]

There are other methods that, based on the user assisted detection and identification of some features and shapes on a set of different pictures of an object are able to build an approximation of the object itself. This kind of techniques are useful to build fast approximation of simple shaped objects like buildings. Various commercial packages are available like D-Sculptor, iModeller, Autodesk ImageModeler, 123DCatch or PhotoModeler.

This sort of 3D imaging solution is based on the principles of photogrammetry. It is also somewhat similar in methodology to panoramic photography, except that the photos are taken of one object on a three-dimensional space in order to replicate it instead of taking a series of photos from one point in a three-dimensional space in order to replicate the surrounding environment.

Reconstruction[edit]

From point clouds[edit]

The point clouds produced by 3D scanners and 3D imaging can be used directly for measurement and visualisation in the architecture and construction world.

From models[edit]

Most applications, however, use instead polygonal 3D models, NURBS surface models, or editable feature-based CAD models (aka Solid models).

• Polygon mesh models: In a polygonal representation of a shape, a curved surface is modeled as many small faceted flat surfaces (think of a sphere modeled as a disco ball). Polygon models—also called Mesh models, are useful for visualisation, for some CAM (i.e., machining), but are generally 'heavy' ( i.e., very large data sets), and are relatively un-editable in this form. Reconstruction to polygonal model involves finding and connecting adjacent points with straight lines in order to create a continuous surface. Many applications, both free and nonfree, are available for this purpose (e.g. GigaMesh, MeshLab, PointCab, kubit PointCloud for AutoCAD, JRC 3D Reconstructor, imagemodel, PolyWorks, Rapidform, Geomagic, Imageware, Rhino 3D etc.).
• Surface models: The next level of sophistication in modeling involves using a quilt of curved surface patches to model the shape. These might be NURBS, TSplines or other curved representations of curved topology. Using NURBS, the spherical shape becomes a true mathematical sphere. Some applications offer patch layout by hand but the best in class offer both automated patch layout and manual layout. These patches have the advantage of being lighter and more manipulable when exported to CAD. Surface models are somewhat editable, but only in a sculptural sense of pushing and pulling to deform the surface. This representation lends itself well to modelling organic and artistic shapes. Providers of surface modellers include Rapidform, Geomagic, Rhino 3D, Maya, T Splines etc.
• Solid CAD models: From an engineering/manufacturing perspective, the ultimate representation of a digitised shape is the editable, parametric CAD model. In CAD, the sphere is described by parametric features which are easily edited by changing a value (e.g., centre point and radius).

These CAD models describe not simply the envelope or shape of the object, but CAD models also embody the 'design intent' (i.e., critical features and their relationship to other features). An example of design intent not evident in the shape alone might be a brake drum's lug bolts, which must be concentric with the hole in the centre of the drum. This knowledge would drive the sequence and method of creating the CAD model; a designer with an awareness of this relationship would not design the lug bolts referenced to the outside diameter, but instead, to the center. A modeler creating a CAD model will want to include both Shape and design intent in the complete CAD model.

Vendors offer different approaches to getting to the parametric CAD model. Some export the NURBS surfaces and leave it to the CAD designer to complete the model in CAD (e.g., Geomagic, Imageware, Rhino 3D). Others use the scan data to create an editable and verifiable feature based model that is imported into CAD with full feature tree intact, yielding a complete, native CAD model, capturing both shape and design intent (e.g. Geomagic, Rapidform). For instance, the market offers various plug-ins for established CAD-programs, such as SolidWorks. Xtract3D, DezignWorks and Geomagic for SolidWorks allow manipulating a 3D scan directly inside SolidWorks. Still other CAD applications are robust enough to manipulate limited points or polygon models within the CAD environment (e.g., CATIA, AutoCAD, Revit).

From a set of 2D slices[edit]

CT, industrial CT, MRI, or Micro-CT scanners do not produce point clouds but a set of 2D slices (each termed a 'tomogram') which are then 'stacked together' to produce a 3D representation. There are several ways to do this depending on the output required:

• Volume rendering: Different parts of an object usually have different threshold values or greyscale densities. From this, a 3-dimensional model can be constructed and displayed on screen. Multiple models can be constructed from various thresholds, allowing different colours to represent each component of the object. Volume rendering is usually only used for visualisation of the scanned object.
• Image segmentation: Where different structures have similar threshold/greyscale values, it can become impossible to separate them simply by adjusting volume rendering parameters. The solution is called segmentation, a manual or automatic procedure that can remove the unwanted structures from the image. Image segmentation software usually allows export of the segmented structures in CAD or STL format for further manipulation.
• Image-based meshing: When using 3D image data for computational analysis (e.g. CFD and FEA), simply segmenting the data and meshing from CAD can become time consuming, and virtually intractable for the complex topologies typical of image data. The solution is called image-based meshing, an automated process of generating an accurate and realistic geometrical description of the scan data.

From laser scans[edit]

Laser scanning describes the general method to sample or scan a surface using laser technology. Several areas of application exist that mainly differ in the power of the lasers that are used, and in the results of the scanning process. Low laser power is used when the scanned surface doesn't have to be influenced, e.g. when it only has to be digitised. Confocal or 3D laser scanning are methods to get information about the scanned surface. Another low-power application uses structured light projection systems for solar cell flatness metrology,^[24] enabling stress calculation throughout in excess of 2000 wafers per hour.^[25]

The laser power used for laser scanning equipment in industrial applications is typically less than 1W. The power level is usually on the order of 200 mW or less but sometimes more.

Applications[edit]

Construction industry and civil engineering[edit]

• Robotic control: e.g. a laser scanner may function as the 'eye' of a robot.^[26][27]
• As-built drawings of bridges, industrial plants, and monuments
• Documentation of historical sites^[28]
• Site modelling and lay outing
• Quality control
• Quantity surveys
• Payload monitoring ^[29]
• Freeway redesign
• Establishing a bench mark of pre-existing shape/state in order to detect structural changes resulting from exposure to extreme loadings such as earthquake, vessel/truck impact or fire.
• Create GIS (geographic information system) maps^[30] and geomatics.
• Subsurface laser scanning in mines and Karst voids.^[31]
• Forensic documentation ^[32]

Design process[edit]

• Increasing accuracy working with complex parts and shapes,
• Coordinating product design using parts from multiple sources,
• Updating old CD scans with those from more current technology,
• Replacing missing or older parts,
• Creating cost savings by allowing as-built design services, for example in automotive manufacturing plants,
• 'Bringing the plant to the engineers' with web shared scans, and
• Saving travel costs.

Entertainment[edit]

3D scanners are used by the entertainment industry to create digital 3D models for movies, video games and leisure purposes. They are heavily utilized in virtual cinematography. In cases where a real-world equivalent of a model exists, it is much faster to scan the real-world object than to manually create a model using 3D modeling software. Frequently, artists sculpt physical models of what they want and scan them into digital form rather than directly creating digital models on a computer.

3D photography[edit]

3D scanners are evolving for the use of cameras to represent 3D objects in an accurate manner.^[33] Companies are emerging since 2010 that create 3D portraits of people (3D figurines or 3D selfies^[34]).

Law enforcement[edit]

3D laser scanning is used by the law enforcement agencies around the world. 3D Models are used for on-site documentation of:^[35]

• Crime scenes
• Bullet trajectories
• Bloodstain pattern analysis
• Accident reconstruction
• Bombings
• Plane crashes, and more

Reverse engineering[edit]

Reverse engineering of a mechanical component requires a precise digital model of the objects to be reproduced. Rather than a set of points a precise digital model can be represented by a polygon mesh, a set of flat or curved NURBS surfaces, or ideally for mechanical components, a CAD solid model. A 3D scanner can be used to digitise free-form or gradually changing shaped components as well as prismatic geometries whereas a coordinate measuring machine is usually used only to determine simple dimensions of a highly prismatic model. These data points are then processed to create a usable digital model, usually using specialized reverse engineering software.

Real estate[edit]

Land or buildings can be scanned into a 3d model, which allows buyers to tour and inspect the property remotely, anywhere, without having to be present at the property.^[36] There is already at least one company providing 3d-scanned virtual real estate tours.^[37] A typical virtual tour would consist of dollhouse view,^[38] inside view, as well as a floor plan.

Virtual/remote tourism[edit]

The environment at a place of interest can be captured and converted into a 3D model. This model can then be explored by the public, either through a VR interface or a traditional '2D' interface. This allows the user to explore locations which are inconvenient for travel.^[39]

Cultural heritage[edit]

There have been many research projects undertaken via the scanning of historical sites and artifacts both for documentation and analysis purposes.^[40]

The combined use of 3D scanning and 3D printing technologies allows the replication of real objects without the use of traditional plaster casting techniques, that in many cases can be too invasive for being performed on precious or delicate cultural heritage artifacts.^[41] In an example of a typical application scenario, a gargoyle model was digitally acquired using a 3D scanner and the produced 3D data was processed using MeshLab. The resulting digital 3D model was fed to a rapid prototyping machine to create a real resin replica of the original object.

Michelangelo[edit]

In 1999, two different research groups started scanning Michelangelo's statues. Stanford University with a group led by Marc Levoy^[42] used a custom laser triangulation scanner built by Cyberware to scan Michelangelo's statues in Florence, notably the David, the Prigioni and the four statues in The Medici Chapel. The scans produced a data point density of one sample per 0.25 mm, detailed enough to see Michelangelo's chisel marks. These detailed scans produced a large amount of data (up to 32 gigabytes) and processing the data from his scans took 5 months. Approximately in the same period a research group from IBM, led by H. Rushmeier and F. Bernardini scanned the Pietà of Florence acquiring both geometric and colour details. The digital model, result of the Stanford scanning campaign, was thoroughly used in the 2004 subsequent restoration of the statue.^[43]

Monticello[edit]

In 2002, David Luebke, et al. scanned Thomas Jefferson's Monticello.^[44] A commercial time of flight laser scanner, the DeltaSphere 3000, was used. The scanner data was later combined with colour data from digital photographs to create the Virtual Monticello, and the Jefferson's Cabinet exhibits in the New Orleans Museum of Art in 2003. The Virtual Monticello exhibit simulated a window looking into Jefferson's Library. The exhibit consisted of a rear projection display on a wall and a pair of stereo glasses for the viewer. The glasses, combined with polarised projectors, provided a 3D effect. Position tracking hardware on the glasses allowed the display to adapt as the viewer moves around, creating the illusion that the display is actually a hole in the wall looking into Jefferson's Library. The Jefferson's Cabinet exhibit was a barrier stereogram (essentially a non-active hologram that appears different from different angles) of Jefferson's Cabinet.

Cuneiform tablets[edit]

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The first 3D models of cuneiform tablets were acquired in Germany in 2000.^[45] In 2003 the so-called Digital Hammurabi project acquired cuneiform tablets with a laser triangulation scanner using a regular grid pattern having a resolution of 0.025 mm (0.00098 in).^[46] With the use of high-resolution 3D-scanners by the Heidelberg University for tablet acquisition in 2009 the development of the GigaMesh Software Framework began to visualize and extract cuneiform characters from 3D-models.^[47] It was used to process ca. 2.000 3D-digitized tablets of the Hilprecht Collection in Jena to create an Open Access benchmark dataset^[48] and an annotated collection^[49] of 3D-models of tablets freely available under CC BY licenses.^[50]

Kasubi Tombs[edit]

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A 2009 CyArk 3D scanning project at Uganda's historic Kasubi Tombs, a UNESCO World Heritage Site, using a Leica HDS 4500, produced detailed architectural models of Muzibu Azaala Mpanga, the main building at the complex and tomb of the Kabakas (Kings) of Uganda. A fire on March 16, 2010, burned down much of the Muzibu Azaala Mpanga structure, and reconstruction work is likely to lean heavily upon the dataset produced by the 3D scan mission.^[51]

'Plastico di Roma antica'[edit]

In 2005, Gabriele Guidi, et al. scanned the 'Plastico di Roma antica',^[52] a model of Rome created in the last century. Neither the triangulation method, nor the time of flight method satisfied the requirements of this project because the item to be scanned was both large and contained small details. They found though, that a modulated light scanner was able to provide both the ability to scan an object the size of the model and the accuracy that was needed. The modulated light scanner was supplemented by a triangulation scanner which was used to scan some parts of the model.

Other projects[edit]

The 3D Encounters Project at the Petrie Museum of Egyptian Archaeology aims to use 3D laser scanning to create a high quality 3D image library of artefacts and enable digital travelling exhibitions of fragile Egyptian artefacts, English Heritage has investigated the use of 3D laser scanning for a wide range of applications to gain archaeological and condition data, and the National Conservation Centre in Liverpool has also produced 3D laser scans on commission, including portable object and in situ scans of archaeological sites.^[53] The Smithsonian Institution has a project called Smithsonian X 3D notable for the breadth of types of 3D objects they are attempting to scan. These include small objects such as insects and flowers, to human sized objects such as Amelia Earhart's Flight Suit to room sized objects such as the Gunboat Philadelphia to historic sites such as Liang Bua in Indonesia. Also of note the data from these scans is being made available to the public for free and downloadable in several data formats.

Medical CAD/CAM[edit]

3D scanners are used to capture the 3D shape of a patient in orthotics and dentistry. It gradually supplants tedious plaster cast. CAD/CAM software are then used to design and manufacture the orthosis, prosthesis or dental implants.

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Many Chairside dental CAD/CAM systems and Dental Laboratory CAD/CAM systems use 3D Scanner technologies to capture the 3D surface of a dental preparation (either in vivo or in vitro), in order to produce a restoration digitally using CAD software and ultimately produce the final restoration using a CAM technology (such as a CNC milling machine, or 3D printer). The chairside systems are designed to facilitate the 3D scanning of a preparation in vivo and produce the restoration (such as a Crown, Onlay, Inlay or Veneer).

Quality assurance and industrial metrology[edit]

The digitalisation of real-world objects is of vital importance in various application domains. This method is especially applied in industrial quality assurance to measure the geometric dimension accuracy. Industrial processes such as assembly are complex, highly automated and typically based on CAD (Computer Aided Design) data. The problem is that the same degree of automation is also required for quality assurance. It is, for example, a very complex task to assemble a modern car, since it consists of many parts that must fit together at the very end of the production line. The optimal performance of this process is guaranteed by quality assurance systems. Especially the geometry of the metal parts must be checked in order to assure that they have the correct dimensions, fit together and finally work reliably.

Within highly automated processes, the resulting geometric measures are transferred to machines that manufacture the desired objects. Due to mechanical uncertainties and abrasions, the result may differ from its digital nominal. In order to automatically capture and evaluate these deviations, the manufactured part must be digitised as well. For this purpose, 3D scanners are applied to generate point samples from the object's surface which are finally compared against the nominal data.^[54]

The process of comparing 3D data against a CAD model is referred to as CAD-Compare, and can be a useful technique for applications such as determining wear patterns on moulds and tooling, determining accuracy of final build, analysing gap and flush, or analysing highly complex sculpted surfaces. At present, laser triangulation scanners, structured light and contact scanning are the predominant technologies employed for industrial purposes, with contact scanning remaining the slowest, but overall most accurate option. Nevertheless, 3D scanning technology offers distinct advantages compared to traditional touch probe measurements. White-light or laser scanners accurately digitize objects all around, capturing fine details and freeform surfaces without reference points or spray. The entire surface is covered at record speed without the risk of damaging the part. Graphic comparison charts illustrate geometric deviations of full object level, providing deeper insights into potential causes.^[55]

Circumvention of shipping costs and international import/export tariffs[edit]

3D Scanning can be used in conjunction with 3D printing technology to virtually teleport certain object across distances without the need of shipping them and in some cases incurring import/export tariffs. For example a plastic object can be 3d scanned in the United states, the files can be sent off to a 3d printing facility over in Germany where the object is replicated, effectively teleporting the object across the globe. In the future, as 3D scanning and 3D printing technologies become more and more prevalent, governments around the world will need to reconsider and rewrite trade agreements and international laws.

See also[edit]

References[edit]

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