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.[4] Being a collection of data (points and other information), 3D models can be created manually, algorithmically (procedural modeling), or by scanning.[5][6] Their surfaces may be further defined with texture mapping.
The product is called a 3D model, while someone who works with 3D models may be referred to as a 3D artist or a 3D modeler.
A 3D model can also be displayed as a two-dimensional image through a process called 3D rendering or used in a computer simulation of physical phenomena.
3D 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. The 3D model can be physically created using 3D printing devices that form 2D layers of the model with three-dimensional material, one layer at a time. Without a 3D model, a 3D print is not possible.
Three-dimensional model of a spectrographRotating 3D video-game model3D selfie models are generated from 2D pictures taken at the Fantasitron 3D photo booth at Madurodam.
3D models are now widely used anywhere in3D graphicsandCAD but their history predates the widespread use of 3D graphics onpersonal computers.[9]
In the past, manycomputer gamesused pre-rendered images of 3D models asspritesbefore computers could render them in real-time. The designer can then see the model in various directions and views, this can help the designer see if the object is created as intended to compared to their original vision. Seeing the design this way can help the designer or company figure out changes or improvements needed to the product.[10]
Representation
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 – These models define the volume of the object they represent (like a rock). Solid models are mostly used for engineering and medical simulations, and are usually built with constructive solid geometry
Shell or boundary – These models represent the surface, i.e. the boundary of the object, not its volume (like an infinitesimally thin eggshell). Almost all visual models used in games and film are shell models.
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. In a shell model of a cube, the bottom and top surface of the cube must have a uniform thickness with no holes or cracks in the first and last layer printed. 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 rasterize (the surface described by each triangle is planar, so the projection is always convex); .[11] 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.
Process
Exploring Different Types of 3D Modelling Techniques [12]
Polygonal Modeling – Polygonal modeling is a fundamental and widely-used technique in 3D modelling. It revolves around connecting vertices, edges, and faces to form polygons, allowing artists precise control over geometry. This technique is efficient in producing detailed furniture models with remarkable accuracy, capturing every intricate detail.
Subdivision Surface Modeling – Subdivision surface modeling is a technique employed to produce smooth and organic shapes from a base mesh. It is particularly valuable when creating furniture pieces such as sofas, cushions, and ergonomic chairs. By subdividing the base mesh and smoothing the surface, high-quality models are created, perfect for marketing or e-commerce purposes.
NURBS Modeling Non-uniform rational basis splines (NURBS) are highly effective in creating smooth and precise surfaces. This technique is ideal for modeling furniture with intricate details and curves. NURBS surfaces maintain their smoothness even when scaled or modified, enabling designers to modify the size or shape of furniture without compromising quality or aesthetics.
Boolean Operations – Boolean 3D modeling, also known as Boolean operations, refers to a technique used in 3D computer graphics to create complex shapes by combining or subtracting multiple objects or volumes. It involves performing operations such as union, intersection, and difference on the geometric primitives or meshes to achieve the desired form. Boolean modeling allows artists and designers to easily create intricate shapes and forms by combining simple objects and manipulating them using Boolean operations. This technique is commonly used in 3D modeling software and is helpful for various applications like architecture, product design, and animation.
Procedural Modeling – Procedural modeling is a technique used in computer graphics and computer-generated imagery (CGI) to create realistic or stylized 3D models. It involves the use of algorithms or rules to generate the geometry, texture, or other properties of a model automatically, rather than manually creating each detail. In procedural modeling, a set of rules or parameters is defined by an artist or programmer to describe the desired characteristics of a model. These rules can be based on mathematics, random variations, or other logical procedures. The model is then generated by applying these rules, often iteratively, to obtain the desired shape, details, and variations. This technique is commonly used in various applications, including generating complex terrains, buildings, vegetation, or even characters. It allows for efficient creation of large-scale environments with detailed and realistic features. Procedural modeling can also be combined with traditional modeling techniques for more flexibility and control over the final result. Some advantages of procedural modeling include the ability to easily modify or recreate models, the potential for realistic variations and randomness, and the ability to create complex and intricate details efficiently. However, it also has limitations, such as the potential for lack of control over specific details or difficulties in achieving specific artistic styles. Overall, procedural modeling is a powerful and versatile technique that enables the creation of complex and realistic 3D models in a more efficient and flexible manner than traditional manual modeling techniques.
Digital sculpting – Digital sculpting is a technique used by artists and designers to create 3D models using specialized software. It allows artists to sculpt virtual objects with tools similar to those used in traditional sculpture, such as brushes, clay, and carving tools. The artist manipulates the virtual clay or material to create intricate and detailed models that can be viewed from all angles. Digital sculpting offers more flexibility and control compared to traditional sculpting methods as it allows for easy undo and redo, scaling, and experimenting with different materials and textures. It is commonly used in industries such as film, animation, video games, and product design. There are currently three types of digital sculpting: Displacement, which is the most widely used among applications at this moment, uses a dense model (often generated by subdivision surfaces of a polygon control mesh) and stores new locations for the vertex positions through use of an image map that stores the adjusted locations. Volumetric, loosely based on voxels, has similar capabilities as displacement but does not suffer from polygon stretching when there are not enough polygons in a region to achieve a deformation. Dynamic tessellation, which is similar to voxel, divides the surface using triangulation to maintain a smooth surface and allow finer details. These methods allow for very artistic exploration as the model will have a new topology created over it once the models form and possibly details have been sculpted. The new mesh will usually have the original high resolution mesh information transferred into displacement data or normal map data if for a game engine.
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., 3D modeling software by Adobe Substance, Blender, Cinema 4D, LightWave, Maya, Modo, 3ds Max) 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).
3D models can also be created using the technique of Photogrammetry with dedicated programs such as RealityCapture, Metashape and 3DF Zephyr. Cleanup and further processing can be performed with applications such as MeshLab, the GigaMesh Software Framework, netfabb or MeshMixer. Photogrammetry creates models using algorithms to interpret the shape and texture of real-world objects and environments based on photographs taken from many angles of the subject.
There are a variety of 3D modeling programs that can be used in the industries of engineering, interior design, film, and others. Each 3D modeling software has specific capabilities and can be utilized to fulfill demands for the industry.
G-code
Many programs include export options to form a g-code, applicable to additive or subtractive manufacturing machinery. G-code (computer numerical control) works with automated technology to form a real-world rendition of 3-D models. This code is a specific set of instructions to carry out steps of a product's manufacturing.[13]
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. There are several modern programs that allow for the creation of virtual human models (Poser being one example).
3D clothing
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.[14] 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[15], as a creation tool for digital fashion brands, as well as for making clothes for avatars in virtual worlds such as SecondLife.
Comparison with 2D methods
3D photorealistic effects are often achieved without wire-frame 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:
Flexibility, ability to change angles or animate images with quicker rendering of the changes;
Ease of rendering, automatic calculation and rendering photorealistic effects rather than mentally visualizing or estimating;
Accurate photorealism, less chance of human error in misplacing, overdoing, or forgetting to include a visual effect.
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
A large market for 3D models (as well as 3D-related content, such as textures, scripts, etc.) 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, MyMiniFactory, Sketchfab, CGTrader, and Cults. 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 while 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.
The architecture, engineering, and construction (AEC) industry is the biggest market for 3D modeling, with an estimated value of $12.13 billion by 2028.[16] This is due to the increasing adoption of 3D modeling in the AEC industry, which helps to improve design accuracy, reduce errors and omissions, and facilitate collaboration among project stakeholders.[17][18]
Over the last several years numerous marketplaces specializing in 3D rendering and printing models have emerged. Some of the 3D printing marketplaces are a 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.
The term 3D printing or three-dimensional printing is a form of additive manufacturing technology where a three-dimensional object is created from successive layers material.[19] Objects can be created without the need for complex expensive molds or assembly with multiple parts. 3D printing allows ideas to be prototyped and tested without having to go through a production process.[19][20]
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 and even medical equipment—.[21][22]
Today, 3D modeling is used in various industries like film, animation and gaming, interior design and architecture.[23] They are also used in the medical industry to create interactive representations of anatomy.[24]
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.[25]
The architecture industry uses them to demonstrate proposed buildings and landscapes in lieu of traditional, physical architectural models. Additionally, the use of Level of Detail (LOD) in 3D models is becoming increasingly important in the AEC industry. LOD is a measure of the level of detail and accuracy included in a 3D model. The LOD levels range from 100 to 500, with LOD 100 representing a conceptual model that shows the basic massing and location of objects, and LOD 500 representing an extremely detailed model that includes information about every aspect of the building, including MEP systems and interior finishes. By using LOD, architects, engineers, and General contractor can more effectively communicate design intent and make more informed decisions throughout the construction process.[26][27]
The archaeology community is now creating 3D models of cultural heritage for research and visualization.[28][29]
The engineering community utilizes 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.
In terms of video game development, 3D modeling is one stage in a longer development process. Simply put, the source of the geometry for the shape of an object can be:
A designer, industrial engineer or artist using a 3D-CAD system
An existing object, reverse engineered or copied using a 3-D shape digitizer or scanner
Mathematical data stored in memory based on a numerical description or calculation of the object.[19]
A wide number of 3D software are also used in constructing digital representation of mechanical models or parts before they are actually manufactured. CAD- and CAM-related software is used in such fields, and with this software, not only can you construct the parts, but also assemble them, and observe their functionality.
3D modeling is also used in the field of industrial design, wherein products are 3D modeled[30] before representing them to the clients. In media and event industries, 3D modeling is used in stage and set design.[31]
3D solid models can be tested in different ways depending on what is needed by using simulation, mechanism design, and analysis. If a motor is designed and assembled correctly (this can be done differently depending on what 3D modeling program is being used), using the mechanism tool the user should be able to tell if the motor or machine is assembled correctly by how it operates. Different design will need to be tested in different ways. For example; a pool pump would need a simulation ran of the water running through the pump to see how the water flows through the pump. These tests verify if a product is developed correctly or if it needs to be modified to meet its requirements.
Rendering or image synthesis is the process of generating a photorealistic or non-photorealistic image from a 2D or 3D model by means of a computer program. The resulting image is referred to as the render. Multiple models can be defined in a scene file containing objects in a strictly defined language or data structure. The scene file contains geometry, viewpoint, textures, lighting, and shading information describing the virtual scene. The data contained in the scene file is then passed to a rendering program to be processed and output to a digital image or raster graphics image file. The term "rendering" is analogous to the concept of an artist's impression of a scene. The term "rendering" is also used to describe the process of calculating effects in a video editing program to produce the final video output.
Vector graphics are a form of computer graphics in which visual images are created directly from geometric shapes defined on a Cartesian plane, such as points, lines, curves and polygons. The associated mechanisms may include vector display and printing hardware, vector data models and file formats, as well as the software based on these data models. Vector graphics is an alternative to raster or bitmap graphics, with each having advantages and disadvantages in specific situations.
Computer-aided design (CAD) is the use of computers to aid in the creation, modification, analysis, or optimization of a design. This software is used to increase the productivity of the designer, improve the quality of design, improve communications through documentation, and to create a database for manufacturing. Designs made through CAD software help protect products and inventions when used in patent applications. CAD output is often in the form of electronic files for print, machining, or other manufacturing operations. The terms computer-aided drafting (CAD) and computer-aided design and drafting (CADD) are also used.
Autodesk 3ds Max, formerly 3D Studio and 3D Studio Max, is a professional 3D computer graphics program for making 3D animations, models, games and images. It is developed and produced by Autodesk Media and Entertainment. It has modeling capabilities and a flexible plugin architecture and must be used on the Microsoft Windows platform. It is frequently used by video game developers, many TV commercial studios, and architectural visualization studios. It is also used for movie effects and movie pre-visualization. 3ds Max features shaders, dynamic simulation, particle systems, radiosity, normal map creation and rendering, global illumination, a customizable user interface, and its own scripting language.
Constructive solid geometry is a technique used in solid modeling. Constructive solid geometry allows a modeler to create a complex surface or object by using Boolean operators to combine simpler objects, potentially generating visually complex objects by combining a few primitive ones.
In computer graphics, level of detail (LOD) refers to the complexity of a 3D model representation. LOD can be decreased as the model moves away from the viewer or according to other metrics such as object importance, viewpoint-relative speed or position. LOD techniques increase the efficiency of rendering by decreasing the workload on graphics pipeline stages, usually vertex transformations. The reduced visual quality of the model is often unnoticed because of the small effect on object appearance when distant or moving fast.
Low poly is a polygon mesh in 3D computer graphics that has a relatively small number of polygons. Low poly meshes occur in real-time applications as contrast with high-poly meshes in animated movies and special effects of the same era. The term low poly is used in both a technical and a descriptive sense; the number of polygons in a mesh is an important factor to optimize for performance but can give an undesirable appearance to the resulting graphics.
In 3D computer graphics, polygonal modeling is an approach for modeling objects by representing or approximating their surfaces using polygon meshes. Polygonal modeling is well suited to scanline rendering and is therefore the method of choice for real-time computer graphics. Alternate methods of representing 3D objects include NURBS surfaces, subdivision surfaces, and equation-based representations used in ray tracers.
3D rendering is the 3D computer graphics process of converting 3D models into 2D images on a computer. 3D renders may include photorealistic effects or non-photorealistic styles.
Form·Z is a general-purpose solid and surface modeling software. It offers 2D/3D form manipulating and sculpting capabilities. It can be used on Windows and Macintosh computers. It is available in English, German, Italian, Spanish, French, Greek, Korean and Japanese languages.
Digital sculpting, also known as sculpt modeling or 3D sculpting, is the use of software that offers tools to push, pull, smooth, grab, pinch or otherwise manipulate a digital object as if it were made of a real-life substance such as clay.
3D computer graphics, sometimes called CGI, 3-D-CGI or three-dimensional computer graphics, are graphics that use a three-dimensional representation of geometric data that is stored in the computer for the purposes of performing calculations and rendering digital images, usually 2D images but sometimes 3D images. The resulting images may be stored for viewing later or displayed in real time.
Computer graphics is a sub-field of computer science which studies methods for digitally synthesizing and manipulating visual content. Although the term often refers to the study of three-dimensional computer graphics, it also encompasses two-dimensional graphics and image processing.
Computer graphics deals with generating images and art with the aid of computers. Today, computer graphics is a core technology in digital photography, film, video games, digital art, cell phone and computer displays, and many specialized applications. A great deal of specialized hardware and software has been developed, with the displays of most devices being driven by computer graphics hardware. It is a vast and recently developed area of computer science. The phrase was coined in 1960 by computer graphics researchers Verne Hudson and William Fetter of Boeing. It is often abbreviated as CG, or typically in the context of film as computer generated imagery (CGI). The non-artistic aspects of computer graphics are the subject of computer science research.
Simplygon is 3D computer graphics software for automatic 3D optimization, based on proprietary methods for creating levels of detail (LODs) through Polygon mesh reduction and other optimization techniques.
Cobalt is a parametric-based computer-aided design (CAD) and 3D modeling program that runs on both Macintosh and Microsoft Windows operating systems. The program combines the direct-modeling way to create and edit objects and the highly structured, history-driven parametric way exemplified by programs like Pro/ENGINEER. A product of Ashlar-Vellum, Cobalt is Wireframe-based and history-driven with associativity and 2D equation-driven parametrics and constraints. It offers surfacing tools, mold design tools, detailing, and engineering features. Cobalt includes a library of 149,000 mechanical parts.
Modo is a polygon and subdivision surface modeling, sculpting, 3D painting, animation and rendering package developed by Luxology, LLC, which is now merged with and known as Foundry. The program incorporates features such as n-gons and edge weighting, and runs on Microsoft Windows, Linux and macOS platforms.
C3D Toolkit is a proprietary cross-platform geometric modeling kit software developed by Russian by C3D Labs. It's written in C++. It can be licensed by other companies for use in their 3D computer graphics software products. The most widely known software in which C3D Toolkit is typically used are computer aided design (CAD), computer-aided manufacturing (CAM), and computer-aided engineering (CAE) systems.
This is a glossary of terms relating to computer graphics.
↑ Latif Kamran, Adam, Anbia, Yusof Yusri, Kadir Aini, Zuhra Abdul.(2021)"A review of G code, STEP, STEP-NC, and open architecture control technologies based embedded CNC systems".The International Journal of Advanced Manufacturing Technology. https://doi.org/10.1007/s00170-021-06741-z
↑ 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.
External links
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