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Newell's Algorithm
Newell's Algorithm is a 3D computer graphics procedure for elimination of polygon cycles in the depth sorting required in hidden surface removal. It was proposed in 1972 by brothers Martin Newell and Dick Newell, and Tom Sancha, while all three were working at CADCentre. In the depth sorting phase of hidden surface removal, if two polygons have no overlapping extents or extreme minimum and maximum values in the x, y, and z directions, then they can be easily sorted. If two polygons, and , do have overlapping extents in the Z direction, then it is possible that cutting is necessary. In that case, Newell's algorithm tests the following: # Test for Z overlap; implied in the selection of the face from the sort list # The extreme coordinate values in X of the two faces do not overlap (minimax test in X) # The extreme coordinate values in Y of the two faces do not overlap (minimax test in Y) # All vertices of P lie deeper than the plane of # All vertices of Q lie closer to the vie ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
3D Computer Graphics
3D computer graphics, sometimes called Computer-generated imagery, CGI, 3D-CGI or three-dimensional Computer-generated imagery, computer graphics, are graphics that use a three-dimensional representation of geometric data (often Cartesian coordinate system#Cartesian coordinates in three dimensions, Cartesian) 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 (possibly as an Computer animation, animation) or displayed in Real-time computer graphics, real time. 3D computer graphics, contrary to what the name suggests, are most often displayed on two-dimensional displays. Unlike 3D film and similar techniques, the result is two-dimensional, without visual depth perception, depth. More often, 3D graphics are being displayed on 3D displays, like in virtual reality systems. 3D graphics stand in contrast to 2D computer graphics which t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Polygon
In geometry, a polygon () is a plane figure made up of line segments connected to form a closed polygonal chain. The segments of a closed polygonal chain are called its '' edges'' or ''sides''. The points where two edges meet are the polygon's '' vertices'' or ''corners''. An ''n''-gon is a polygon with ''n'' sides; for example, a triangle is a 3-gon. A simple polygon is one which does not intersect itself. More precisely, the only allowed intersections among the line segments that make up the polygon are the shared endpoints of consecutive segments in the polygonal chain. A simple polygon is the boundary of a region of the plane that is called a ''solid polygon''. The interior of a solid polygon is its ''body'', also known as a ''polygonal region'' or ''polygonal area''. In contexts where one is concerned only with simple and solid polygons, a ''polygon'' may refer only to a simple polygon or to a solid polygon. A polygonal chain may cross over itself, creating star polyg ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hidden Surface Determination
In 3D computer graphics, hidden-surface determination (also known as shown-surface determination, hidden-surface removal (HSR), occlusion culling (OC) or visible-surface determination (VSD)) is the process of identifying what surfaces and parts of surfaces can be seen from a particular viewing angle. A hidden-surface determination algorithm is a solution to the visibility problem, which was one of the first major problems in the field of 3D computer graphics. The process of hidden-surface determination is sometimes called hiding, and such an algorithm is sometimes called a hider. When referring to line rendering it is known as hidden-line removal. Hidden-surface determination is necessary to render a scene correctly, so that one may not view features hidden behind the model itself, allowing only the naturally viewable portion of the graphic to be visible. Background Hidden-surface determination is a process that identifies which surfaces are not visible to the user (for example, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Martin Newell (computer Scientist)
Martin Edward Newell is a British-born computer scientist specializing in computer graphics who is perhaps best known as the creator of the Utah teapot computer model. Career Before emigrating to the US, he worked at what was then the Computer-Aided Design Centre (AVEVA, CADCentre) in Cambridge, UK, along with his brother Dick Newell (who went on to co-found two of the most important UK graphics software companies – Cambridge Interactive Systems (CIS) in 1977 and Smallworld in 1987). At CADCentre, the two Newells and Tom Sancha developed Newell's algorithm, a technique for eliminating cyclic dependencies when ordering polygons to be drawn by a computer graphics system. Newell developed the Utah teapot while working on a Ph.D. at the University of Utah, where he also helped develop a version of the painter's algorithm for Rendering (computer graphics), rendering. He graduated in 1975, and was on the Utah faculty from 1977 to 1979. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dick Newell
Richard G. Newell is a British businessman and technologist in the software industry in Computer aided design (CAD) and Geographic Information Systems (GIS). Career Newell holds degrees in Civil Engineering and Numerical Analysis and a PhD in Chemical Engineering from Imperial College, London. As a software engineer, he worked at CADCentre alongside his brother Martin Newell who is perhaps best known as the creator of the Utah Teapot (or Newell teapot). It was at the centre that Newell oversaw the creation of the successful Plant Design Management System (PDMS) for 3D process plant design. In 1972 Newell, his brother Martin and Tom Sancha proposed the Newell's algorithm procedure. He co-founded his first company, Cambridge Interactive Systems Ltd. (CIS) in 1977. CIS was part of what became known as 'The Cambridge Phenomenon'. by David Connell and Jocelyn Probert Centre for Business Research, University of Cambridge Newell co-founded Smallworld Systems in 1988. The company ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Painters Problem
Painting is a Visual arts, visual art, which is characterized by the practice of applying paint, pigment, color or other medium to a solid surface (called "matrix" or "Support (art), support"). The medium is commonly applied to the base with a brush. Other implements, such as palette knives, sponges, airbrushes, the artist's fingers, or even a dripping technique that uses gravity may be used. One who produces paintings is called a painter. In art, the term "painting" describes both the act and the result of the action (the final work is called "a painting"). The support for paintings includes such surfaces as walls, paper, canvas, wood, glass, lacquer, pottery, leaf, copper and concrete, and the painting may incorporate other materials, in single or multiple form, including sand, clay, paper, cardboard, newspaper, plaster, gold leaf, and even entire objects. Painting is an important form of visual arts, visual art, bringing in elements such as drawing, Composition (visual art ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
