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Encyclopedia > 3D printing
3D computer graphics
Basics

3D modeling / 3D scanning
3D rendering / 3D printing
3D computer graphics software
3D computer graphics are different from 2D computer graphics in that a three-dimensional representation of geometric data is stored in the computer for the purposes of performing calculations and rendering 2D images. ... Image File history File links Download high-resolution version (2048x1536, 2972 KB) copied from English Wikipedia, there uploaded by en:User:Gilles Tran, en:User:Janke and en:User:Veledan. ... 3D modeling is the creation of 3D computer graphics based on wire frame modeling via specialized software. ... A 3D scanner is a device that analyzes a real-world object or environment to collect data on its shape and possibly its appearance (i. ... 3D rendering is the 3D computer graphics process of automatically converting 3D wire frame models into 2D images with 3D photorealistic effects on a computer. ... Modeling in LightWave. ...

Primary Uses

3D models / Computer-aided design
Graphic design / Computer games
Visual effects / Visualization
Virtual engineering / Virtual reality
This article does not cite its references or sources. ... “CAD” redirects here. ... This article does not cite any references or sources. ... “Computer Games” redirects here. ... Visual Effects (or VFX for short) is the term given to a sub-category of special effects in which images or film frames are created and manipulated for film and video. ... It has been suggested that Interactive visualization be merged into this article or section. ... Virtual engineering is defined as integrating geometric models and related engineering tools such as analysis and simulation, optimization and decision making tools, etc. ... This article is about the simulation technology. ...

Related concepts

CGI / Animation / 3D display
Wireframe model / Texture mapping
Computer animation / Motion capture
Skeletal animation / Crowd simulation
Global illumination Computer-generated imagery (commonly abbreviated as CGI) is the application of the field of computer graphics (or more specifically, 3D computer graphics) to special effects in films, television programs, commercials, simulators and simulation generally, and printed media. ... The bouncing ball animation (below) consists of these 6 frames. ... A 3D display prototype by Philips A 3D display is any display device capable of conveying three-dimensional images to the viewer. ... A wire frame model is a visual presentation of an electronic representation of a three dimensional or physical object used in 3D computer graphics. ... Spherical texture mapping Texture mapping is a method, pioneered by Edwin Catmull, of adding detail, surface texture, or colour to a computer-generated graphic or 3D model. ... Computer animation is the art of creating moving images via the use of computers. ... Motion capture, or mocap, is a technique of digitally recording the movements of real things — usually humans — it originally developed as an analysis tool in biomechanics research, but has grown increasingly important as a source of motion data for computer animation. ... A technique in computer animation, particularly the animation of vertebrates, where a character is represented in two parts: a surface representation used to draw the character (called the skin) and a hierarchical set of bones used for animation only (called the skeleton). ... Crowd simulation is the process of simulating the movement of a large number of objects or characters, now often appearing in 3D computer graphics for film. ... Global illumination algorithms used in 3D computer graphics are commonly used to add realistic lighting to 3D scenes. ...

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Three-dimensional printing is a method of converting a virtual 3D model into a physical object. 3D printing is a category of rapid prototyping technology. 3D printers typically work by 'printing' successive layers on top of the previous to build up a three dimensional object. 3D printers are generally faster, more affordable and easier to use than other additive fabrication technologies.[1] This article does not cite its references or sources. ... A rapid prototyping machine using Selective laser sintering. ...

Contents

Technologies

One variation consists of an inkjet printing system. Layers of a fine powder (plaster and resins) are selectively bonded by "printing" a water-based adhesive from the inkjet printhead in the shape of each cross-section as determined by a CAD (computer aided design) file. This technology is the only one that allows for the printing of full color prototypes. It is also recognized as the fastest method. This technology is marketed commercially by Z Corporation. Inkjet printers are a type of computer printer that operates by propelling tiny droplets of liquid ink onto paper. ... This article is about the building material. ... This article does not cite any references or sources. ... CAD is a TLA that may stand for: Cadiz Railroad (AAR reporting mark CAD) Canadian dollar – ISO 4217-code Capital Adequacy Directive Card Acceptance Device Children of the Anachronistic Dynasty Computer-aided design Computer-aided detection (medical) Computer-aided diagnosis (medical) Computer-assisted dispatch Computer-assisted drafting Coronary artery disease...


Alternately, these machines feed liquids, such as photopolymer, also through an inkjet-type printhead to form each layer of the model. These Photopolymer Phase machines employ an ultraviolet (UV) flood lamp mounted in the print head to cure each layer as it is deposited. This technology is marketed commercially by 3D Systems (MJM) and Objet (Polyjet). For other uses, see Ultraviolet (disambiguation). ...


Fused deposition modeling (FDM), a technology also used in traditional rapid prototyping uses a nozzle to deposit molten polymer onto a support structure, layer by layer. This technology is marketed commercially by Stratasys (Dimension), and the first Open Source designs such as RepRap and Fab@Home are beginning to become available. Fused deposition modeling, which is often referred to by its initials FDM, is a type of rapid prototyping or rapid manufacturing (RP) technology commonly used within engineering design. ... Fused deposition modeling, which is often referred to by its initials FDM, is a type of rapid prototyping or rapid manufacturing (RP) technology commonly used within engineering design. ... Something to do with a self replicating robot. ...


Another approach is selective fusing of print media in a granular bed, as represented by the CandyFab design. In this variation, the unfused media serves to support overhangs and thin walls in the part being produced, reducing the need for auxiliary temporary supports for the workpiece. Midpoint in printing a toroidal coil sculpture on the CandyFab 4000, an experimental rapid prototyping machine that can use granulated sugar as the printing medium. ...


Each technology has its advantages and drawbacks. Generally, the main considerations are speed, cost of the printed prototype, cost of the 3D printer, choice of materials, color capabilities, etc. [2]


Unlike traditional additive systems such as stereolithography, 3D printing is optimized primarily for speed and low-cost and ease-of-use, making it suitable for visualizing during the conceptual stages of engineering design when dimensional accuracy and mechanical strength of prototypes are less important. Stereolithography is one of the more commonly used rapid manufacturing and rapid prototyping technologies. ...


Resolution

Resolution is given in layer thickness and X-Y resolution in dpi. Typical layer thickness is around 0.1 mm, while X-Y resolution is comparable to that of laser printers. The particles (3D dots) are around 50 to 100 microns in diameter. Dots per inch (DPI) is a measure of printing resolution, in particular the number of individual dots of ink a printer or toner can produce within a linear one-inch space. ... A micrometre (American spelling: micrometer, symbol µm) is an SI unit of length equal to one millionth of a metre, or about a tenth of the diameter of a droplet of mist or fog. ...


Medical research

3D printing technology is currently being studied by biotechnology firms and academia for possible use in tissue engineering applications where organs and body parts are built using inkjet techniques. Layers of living cells are deposited onto a gel medium and slowly built up to form three dimensional structures. Several terms have been used to refer to this field of research: Organ printing, bio-printing, and computer-aided tissue engineering among others.[3] Tissue engineering is the use of a combination of cells, engineering and materials methods, and suitable biochemical and physio-chemical factors to improve or replace biological functions. ... Tissue engineering is the use of a combination of cells, engineering or tissue-matrix materials, and suitable biochemical factors to improve or replace biological functions. ...


References

  1. ^ http://www.ptonline.com/articles/200408cu3.html
  2. ^ http://wohlersassociates.com/NovDec05TCT3dp.htm
  3. ^ http://abcnews.go.com/Technology/story?id=1603783&page=1

See also

A rapid prototyping machine using Selective laser sintering. ... Stereolithography is one of the more commonly used rapid manufacturing and rapid prototyping technologies. ... Solid freeform fabrication (SFF) is a technique for manufacturing solid objects by the sequential delivery of energy and/or material to specified points in space to produce that solid. ... A simple form of machine self-replication The concept of self-replicating machines has been most notably advanced and examined by, Homer Jacobsen, Edward F. Moore, Freeman Dyson, John von Neumann and in more recent times notably K. Eric Drexler in his seminal book on nanotechnology, Engines of Creation. ... This article or section is in need of attention from an expert on the subject. ... A digital fabricator (commonly shortened to fabber) is a small, self-contained factory that can make objects described by digital data. ... Desktop manufacturing or personal fabrication is the use of a personal computer to drive a printer that deposits (or catalyses) material in layers to form three-dimensional objects. ...

External links


  Results from FactBites:
 
3D Fun (3149 words)
When the 3D print is observed with the axes of the lenticules vertical, each eye sees a different view from the original set exposed onto the screen.
To create a print by a direct non-photographic approach, say by lithography, one must be sure that print head is aligned and remains aligned with the lenticules during the printing process.
Since the resolution affects the print size, the desired print size should be decided upon before interlacing and the files expanded or contracted as necessary.
'Gadget printer' promises industrial revolution - 08 January 2003 - New Scientist (654 words)
The trick is to print layer upon layer of conducting and semiconducting polymers in such a way that the circuitry the device requires is built up as part of the bodywork.
Such printing techniques have become so sophisticated it is now possible to print working prototypes with mechanical parts that move as they would in the final product.
By printing with "electroactive" polymers, which produce voltages across them when compressed, or bunch up tight when a voltage is applied to them, the printed devices can be made to respond to pressure or flex in certain directions.
  More results at FactBites »


 

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