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The hidden-line algorithm uses n 2 exclusive read, exclusive write (EREW) PRAM processors. The EREW model is the PRAM variant closest to real machines. The hidden-line algorithm does O(n 2 log n) work, which is the upper bound for the best sequential algorithms used in practice. Cook, Dwork and Reischuk gave an Ω(log n) lower bound for finding ...
Hidden lines are particularly useful when viewing an object from an angle where the visible only lines do not have much information. In a computer drawing application the option may be referred to a wire frame with hidden edges. [6] The hidden edges would be dashed lines. A wire-frame image using hidden-line removal
Out Line 0.20 or 0.25 White, Cyan, Yellow, Blue Hidden Line 0.00 or 0.05 Blue, Gray, 241 Center Line 0.10 or 0.15 Green, Red, Blue Note 0.18 or 0.20 White, Cyan, Green, 41 Thin Line 0.00 or 0.05 Gray, 08, 111 Reference Line 0.000 Magenta, Gray Hatch Line 0.000 Magenta, Green, Gray, red Color-9 to 256 0.000 Dimension line Leader Line with Arrows
Example mechanical drawing. Here is an example of an engineering drawing (an isometric view of the same object is shown above). The different line types are colored for clarity. Black = object line and hatching; Red = hidden line; Blue = center line of piece or opening; Magenta = phantom line or cutting plane line
Hidden-surface determination is a process by which surfaces that should not be visible to the user (for example, because they lie behind opaque objects such as walls) are prevented from being rendered. Despite advances in hardware capability, there is still a need for advanced rendering algorithms. The responsibility of a rendering engine is to ...
Enjoy a classic game of Hearts and watch out for the Queen of Spades!
Caddie is a mid-range computer-assisted draughting (CAD) software package for 2D and 3D design. It is used primarily by architects, but has tools for surveyors and mechanical, civil and construction engineers. It was initially designed as an electronic drawing board, using concepts and tools clearly related to a physical board. [2]
For example, in a city street scene, there is generally no need to draw the polygons on the sides of the buildings facing away from the camera; they are completely occluded by the sides facing the camera. In general, back-face culling can be assumed to produce no visible artifact in a rendered scene if it contains only closed and opaque geometry.