hidden line removal - significado y definición. Qué es hidden line removal
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Qué (quién) es hidden line removal - definición

COMPUTER GRAPHICS
Line removal; Hidden-line algorithms; Parallel algorithms for hidden line removal; Hidden line removal
  • A wire-frame image using hidden-line removal

Hidden-line removal         
In 3D computer graphics, solid objects are usually modeled by polyhedra. A face of a polyhedron is a planar polygon bounded by straight line segments, called edges.
Hidden profile         
Hidden profile problem; Hidden profiles
A hidden profile is a paradigm that occurs in the process of group decision making. It is found in a situation when part of some information is shared among group members (i.
Hidden mother photography         
PHOTOGRAPHY GENRE
Hidden mother; Hidden mothers; Hidden mother photograph
Hidden mother photography is a genre of photography common in the Victorian era in which young children were photographed with their mother present but hidden in the photograph. It arose from the need to keep children still while the photograph was taken due to the long exposure times of early cameras.

Wikipedia

Hidden-line removal

In 3D computer graphics, solid objects are usually modeled by polyhedra. A face of a polyhedron is a planar polygon bounded by straight line segments, called edges. Curved surfaces are usually approximated by a polygon mesh. Computer programs for line drawings of opaque objects must be able to decide which edges or which parts of the edges are hidden by an object itself or by other objects, so that those edges can be clipped during rendering. This problem is known as hidden-line removal.

The first known solution to the hidden-line problem was devised by L. G. Roberts in 1963. However, it severely restricts the model: it requires that all objects be convex. Ruth A. Weiss of Bell Labs documented her 1964 solution to this problem in a 1965 paper. In 1966 Ivan E. Sutherland listed 10 unsolved problems in computer graphics. Problem number seven was "hidden-line removal". In terms of computational complexity, this problem was solved by Devai in 1986.

Models, e.g. in computer-aided design, can have thousands or millions of edges. Therefore, a computational-complexity approach expressing resource requirements (such as time and memory) as the function of problem sizes is crucial. Time requirements are particularly important in interactive systems.

Problem sizes for hidden-line removal are the total number n of the edges of the model and the total number v of the visible segments of the edges. Visibility can change at the intersection points of the images of the edges. Let k denote the total number of the intersection points of the images of the edges. Both k = Θ(n2) and v = Θ(n2) in the worst case, but usually v < k.