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D modeling - Wikipedia. This article is about computer modeling within an artistic medium.

For scientific usage, see Computer simulation. In 3. D computer graphics, 3. D 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 3. D model. Someone who works with 3.

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D models may be referred to as a 3. D artist. It can be displayed as a two- dimensional image through a process called 3. D rendering or used in a computer simulation of physical phenomena.

The model can also be physically created using 3. D printing devices. Models may be created automatically or manually. The manual modeling process of preparing geometric data for 3. D computer graphics is similar to plastic arts such as sculpting. D modeling software is a class of 3.

D computer graphics software used to produce 3. D models. Individual programs of this class are called modeling applications or modelers. Three- dimensional (3. D) models represent a physical body using a collection of points in 3.

D space, connected by various geometric entities such as triangles, lines, curved surfaces, etc. Being a collection of data (points and other information), 3. D models can be created by hand, algorithmically (procedural modeling), or scanned. Their surfaces may be further defined with texture mapping. D models are widely used anywhere in 3. D graphics and CAD. Their use predates the widespread use of 3.

D graphics on personal computers. Many computer games used pre- rendered images of 3. D models as sprites before computers could render them in real- time.

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Today, 3. D 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. 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 3. D geological models as a standard practice.

D models can also be the basis for physical devices that are built with 3. D printers or CNC machines. Representation. The Utah teapot is one of the most common models used in 3. D graphics education. Almost all 3. D 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/boundary – these models represent the surface, e. 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. 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 (.

Meshes of triangles (instead of e. The vast majority of 3. D models today are built as textured polygonal models, because they are flexible and because computers can render them so quickly. However, polygons are planar and can only approximate curved surfaces using many polygons.

Curve modeling – Surfaces are defined by curves, which are influenced by weighted control points. The curve follows (but does not necessarily interpolate) the points. Increasing the weight for a point will pull the curve closer to that point. Curve types include nonuniform rational B- spline (NURBS), splines, patches, and geometric primitives. Digital sculpting – Still a fairly new method of modeling, 3.

D sculpting has become very popular in the few years it has been around. 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 is similar to voxel but 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. There are a number of modeling techniques, including: Modeling can be performed by means of a dedicated program (e. Cinema 4. D, Maya, 3ds Max, Blender, Light. Wave, 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 true.

Space and Realsoft 3. D). Complex materials such as blowing sand, clouds, and liquid sprays are modeled with particle systems, and are a mass of 3. D coordinates which have either points, polygons, texture splats, or sprites assigned to them. Human models. The human virtual models were created by the company My Virtual Mode Inc.

Some graphic art software includes filters that can be applied to 2. D vector graphics or 2. D raster graphics on transparent layers. Advantages of wireframe 3. D modeling over exclusively 2. D 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 2.

D 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 3. D modeling software. For the best of both worlds, some artists use a combination of 3. D modeling followed by editing the 2. D computer- rendered images from the 3.

D model. 3. D model market. Several online marketplaces for 3. Best Free Security Dvr Software. D content allow individual artists to sell content that they have created, including Turbo. Squid, CGStudio, Creative. Market 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 4. 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 3. D printing models have emerged.