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In "3D computer graphics, 3D modeling (or three-dimensional modeling) is the process of developing a mathematical representation of any "surface of an object (either inanimate or living) in "three dimensions via "specialized software. The product is called a 3D model. Someone who works with 3D models may be referred to as a 3D artist. It can be displayed as a two-dimensional image through a process called "3D rendering or used in a "computer simulation of physical phenomena. The model can also be physically created using "3D printing devices.

Models may be created automatically or manually. The manual modeling process of preparing geometric data for 3D computer graphics is similar to "plastic arts such as "sculpting.

3D modeling software is a class of "3D computer graphics software used to produce 3D models. Individual programs of this class are called modeling applications or modelers.

Contents

Models[edit]

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Three-dimensional model of a "spectrograph[1]

Three-dimensional (3D) models represent a "physical body using a collection of points in 3D space, connected by various geometric entities such as triangles, lines, curved surfaces, etc. Being a collection of data ("points and other information), 3D models can be created by hand, "algorithmically ("procedural modeling), or "scanned. Their surfaces may be further defined with "texture mapping.

3D models are widely used anywhere in "3D graphics and "CAD. Their use predates the widespread use of 3D graphics on "personal computers. Many "computer games used pre-rendered images of 3D models as "sprites before computers could render them in real-time.

Today, 3D models are used in a wide variety of fields. The medical industry uses detailed models of organs; these may be created with multiple 2-D image slices from an "MRI or "CT scan. The movie industry uses them as characters and objects for animated and real-life "motion pictures. The "video game industry uses them as assets for "computer and video games. The "science sector uses them as highly detailed models of chemical compounds.[2] The architecture industry uses them to demonstrate proposed buildings and landscapes in lieu of traditional, physical "architectural models. The engineering community uses them as designs of new devices, vehicles and structures as well as a host of other uses. In recent decades the "earth science community has started to construct 3D geological models as a standard practice. 3D models can also be the basis for physical devices that are built with "3D printers or "CNC machines.

Representation[edit]

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A modern render of the iconic "Utah teapot model developed by "Martin Newell (1975). The Utah teapot is one of the most common models used in 3D graphics education.

Almost all 3D models can be divided into two categories.

Solid and shell modeling can create functionally identical objects. Differences between them are mostly variations in the way they are created and edited and conventions of use in various fields and differences in types of approximations between the model and reality.

Shell models must be "manifold (having no holes or cracks in the shell) to be meaningful as a real object. "Polygonal meshes (and to a lesser extent "subdivision surfaces) are by far the most common representation. "Level sets are a useful representation for deforming surfaces which undergo many topological changes such as "fluids.

The process of transforming representations of objects, such as the middle point coordinate of a "sphere and a point on its "circumference into a polygon representation of a sphere, is called "tessellation. This step is used in polygon-based rendering, where objects are broken down from abstract representations (""primitives") such as spheres, "cones etc., to so-called meshes, which are nets of interconnected triangles. Meshes of triangles (instead of e.g. "squares) are popular as they have proven to be easy to "rasterise (the surface described by each triangle is planar, so the projection is always convex); .[3] Polygon representations are not used in all rendering techniques, and in these cases the tessellation step is not included in the transition from abstract representation to rendered scene.

Modeling process[edit]

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3D polygonal modelling of a human face.

There are three popular ways to represent a model:

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A 3D fantasy fish composed of organic surfaces generated using LAI4D.

The modeling stage consists of shaping individual objects that are later used in the scene. There are a number of modeling techniques, including:

Modeling can be performed by means of a dedicated program (e.g., "Cinema 4D, "Maya, "3ds Max, "Blender, "LightWave, "Modo) or an application component (Shaper, Lofter in 3ds Max) or some scene description language (as in "POV-Ray). In some cases, there is no strict distinction between these phases; in such cases modeling is just part of the scene creation process (this is the case, for example, with Caligari "trueSpace and "Realsoft 3D).

Complex materials such as blowing sand, clouds, and liquid sprays are modeled with "particle systems, and are a mass of 3D "coordinates which have either "points, "polygons, "texture splats, or "sprites assigned to them.

Human models[edit]

The first widely available commercial application of human virtual models appeared in 1998 on the "Lands' End web site. The human virtual models were created by the company My Virtual Mode Inc. and enabled users to create a model of themselves and try on 3D clothing.[4] There are several modern programs that allow for the creation of virtual human models ("Poser being one example).

3D Clothing[edit]

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Dynamic 3D Clothing Model made in Marvelous Designer

The development of cloth simulation software such as Marvelous Designer, CLO3D and Optitex, has enabled artists and fashion designers to model dynamic 3D clothing on the computer.[5] Dynamic 3D clothing is used for virtual fashion catalogs, as well as for dressing 3D characters for video games, 3D animation movies, for digital doubles in movies[6] as well as for making clothes for avatars in virtual worlds such as "SecondLife.

Compared to 2D methods[edit]

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A fully "textured and "lit rendering of a 3D model.

3D "photorealistic effects are often achieved without wireframe modeling and are sometimes indistinguishable in the final form. Some "graphic art software includes filters that can be applied to 2D vector graphics or 2D "raster graphics on transparent layers.

Advantages of wireframe 3D modeling over exclusively 2D methods include:

Disadvantages compare to 2D photorealistic rendering may include a software learning curve and difficulty achieving certain photorealistic effects. Some photorealistic effects may be achieved with special rendering filters included in the 3D modeling software. For the best of both worlds, some artists use a combination of 3D modeling followed by editing the 2D computer-rendered images from the 3D model.

3D model market[edit]

A large market for 3D models (as well as 3D-related content, such as textures, scripts, etc.) still exists – either for individual models or large collections. Several online marketplaces for 3D content allow individual artists to sell content that they have created, including "TurboSquid, CGStudio, CreativeMarket and "CGTrader. Often, the artists' goal is to get additional value out of assets they have previously created for projects. By doing so, artists can earn more money out of their old content, and companies can save money by buying pre-made models instead of paying an employee to create one from scratch. These marketplaces typically split the sale between themselves and the artist that created the asset, artists get 40% to 95% of the sales according to the marketplace. In most cases, the artist retains ownership of the 3d model; the customer only buys the right to use and present the model. Some artists sell their products directly in its own stores offering their products at a lower price by not using intermediaries.

Over the last several years numerous marketplaces specialized in 3D printing models have emerged. Some of the "3D printing marketplaces are combination of models sharing sites, with or without a built in e-com capability. Some of those platforms also offer 3D printing services on demand, software for model rendering and dynamic viewing of items, etc. 3D printing file sharing platforms include "Shapeways, "Pinshape, "Thingiverse, "TurboSquid, "CGTrader, "Threeding, "MyMiniFactory, and "GrabCAD.

3D printing[edit]

3D printing is a form of additive manufacturing technology where a three dimensional object is created by laying down or build from successive layers of material.

In recent years, there has been an upsurge in the number of companies offering personalized 3D printed models of objects that have been scanned, designed in CAD software, and then printed to the customer's requirements. As previously mentioned, 3D models can be purchased from online marketplaces and printed by individuals or companies using commercially available 3D printers, enabling the home-production of objects such as spare parts,[7] mathematical models,[8] and even medical equipment.[9]

Uses[edit]

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Steps of "forensic facial reconstruction of a "mummy made in "Blender by the Brazilian 3D designer Cícero Moraes.

3D modeling is used in various industries like films, animation and gaming, "interior designing and "architecture. They are also used in the medical industry for the interactive representations of anatomy. A wide number of 3D software are also used in constructing digital representation of mechanical models or parts before they are actually manufactured. "CAD/CAM related software are used in such fields, and with these software, not only can you construct the parts, but also assemble them, and observe their functionality.

3D modelling is also used in the field of "Industrial Design, wherein products are 3D modeled before representing them to the clients. In Media and Event industries, 3D modelling is used in "Stage/Set Design.

The "OWL 2 translation of the "vocabulary of "X3D can be used to provide "semantic descriptions for "3D models, which is suitable for indexing and retrieval of "3D models by features such as geometry, dimensions, material, texture, diffuse reflection, transmission spectra, transparency, reflectivity, opalescence, glazes, varnishes, and enamels (as opposed to "unstructured textual descriptions or "2.5D virtual museums and exhibitions using "Google Street View on "Google Arts & Culture, for example).[10] The "RDF "representation of "3D models can be used in "reasoning, which enables intelligent 3D applications which, for example, can automatically compare two "3D models by volume.[11]

See also[edit]

References[edit]

  1. ^ "ERIS Project Starts". ESO Announcement. Retrieved 14 June 2013. 
  2. ^ "3D Scanning Advancements in Medical Science". Konica Minolta. Retrieved 24 October 2011. 
  3. ^ "Jon Radoff, Anatomy of an MMORPG Archived 2009-12-13 at the "Wayback Machine., August 22, 2008
  4. ^ "Lands' End First With New 'My Virtual Model' Technology: Takes Guesswork Out of Web Shopping for Clothes That Fit". PRNewswire. "Lands' End. February 12, 2004. Retrieved 2013-11-24. 
  5. ^ "All About Virtual Fashion and the Creation of 3D Clothing". CGElves. Retrieved 25 December 2015. 
  6. ^ "3D Clothes made for The Hobbit using Marvelous Designer". 3DArtist. Retrieved 9 May 2013. 
  7. ^ "3D Printing Toys". Business Insider. Retrieved 25 January 2015. 
  8. ^ "Printout3D—Wolfram Language Documentation". reference.wolfram.com. Retrieved 2016-08-06. 
  9. ^ "New Trends in 3D Printing – Customized Medical Devices". Envisiontec. Retrieved 25 January 2015. 
  10. ^ Sikos, L. F. (2016). Rich Semantics for Interactive 3D Models of Cultural Artifacts. Communications in Computer and Information Science. 672. "Springer International Publishing. pp. 169–180. "doi:10.1007/978-3-319-49157-8_14. 
  11. ^ Yu, D.; Hunter, J. (2014). "X3D Fragment Identifiers—Extending the Open Annotation Model to Support Semantic Annotation of 3D Cultural Heritage Objects over the Web". International Journal of Heritage in the Digital Era. 3 (3): 579–596. "doi:10.1260/2047-4970.3.3.579. 
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