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CumInCAD is a Cumulative Index about publications in Computer Aided Architectural Design
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_id	186e
authors	Blinn, J.F. and Newell, M.E.
year	1976
title	Texture and Reflection in Computer Generated Images
source	Communications of the ACM 19 10 542-547
summary	In 1974 Catmull developed a new algorithm for rendering images of bivariate surface patches. This paper describes extensions of this algorithm in the areas of texture simulation and lighting models. The parametrization of a patch defines a coordinate system which is used as a key for mapping patterns onto the surface. The intensity of the pattern at each picture element is computed as a weighted average of regions of the pattern definition function. The shape and size of this weighting function are chosen using digital signal processing theory. The patch rendering algorithm allows accurate computation of the surface normal to the patch at each picture element, permitting the simulation of mirror reflections. The amount of light coming from a given direction is modeled in a similar manner to the texture mapping and then added to the intensity obtained from the texture mapping. Several examples of images synthesized using these new techniques are included.
series	journal paper
last changed	2003/11/21 15:16

_id	62c4
authors	Blinn, James F. and Newell, Martin E.
year	1976
title	Texture and Reflection in Computer Generated Images
source	communications of the ACM October, 1976. vol. 19: pp. 542-547 : ill. (col.). includes bibliography.
summary	In 1974 Catmull developed a new algorithm for rendering images of bivariate surface patches. This paper describes extensions of this algorithm in the areas of texture simulation and lighting models. The parametrization of a patch defines a coordinate system which is used as a key for mapping patterns onto the surface. The intensity of the pattern at each picture element is computed as a weighted average of regions of the pattern definition function. The shape and size of this weighting function are chosen using digital signal processing theory. The patch rendering algorithm allows accurate computation of the surface normal to the patch at each picture element, permitting the simulation of mirror reflections. The amount of light coming from a given direction is modeled in a similar manner to the texture mapping and then added to the intensity obtained from the texture mapping. Several examples of images synthesized using these new techniques are included
keywords	algorithms, computer graphics, shading, hidden surfaces, texture mapping, curved surfaces, rendering
series	CADline
last changed	2003/06/02 13:58

_id	2866
authors	Clark, James H.
year	1976
title	Hierarchical Geometric Model for Visible Surface Algorithms
source	communications of the ACM. October, 1976. vol. 19: pp. 547-554 : ill. includes bibliography
summary	The geometric structure inherent in the definition of the shapes of three-dimensional objects and environments is used not just to define their relative motion and placement, but also to assist in solving many other problems of systems for producing pictures by computers. By using an extension of traditional structure information, or a geometric hierarchy, five significant improvements to current techniques are possible. First, the range of complexity of an environment is greatly increased while the visible complexity of any given scene is kept within a fixed upper limit. Second, a meaningful way is provided to vary the amount of detail presented in a scene. Third, 'clipping' becomes a very fast logarithmic search for the resolvable parts of the environment within the field of view. Fourth, frame to frame coherence and clipping define a graphical 'working set,' or fraction of the total structure that should be present in primary store for immediate access by the visible surface algorithm. Finally, the geometric structure suggests a recursive descent, visible surface algorithm in which the computation time potentially grows linearly with the visible complexity of the scene
keywords	hidden lines, hidden surfaces, data structures, clipping, geometric modeling, algorithms, computer graphics
series	CADline
last changed	2003/06/02 13:58

_id	888b
authors	Levin, Joshua
year	1976
title	A Parametric Algorithm for Drawing Pictures of Solid Objects Composed of Quadric Surfaces
source	Communications of the ACM. October, 1976. vol. 19: pp. 555- 563. includes bibliography
summary	An algorithm for drawing pictures of three-dimensional objects, with surfaces made up of patches of quadric surfaces, is described. The emphasis of this algorithm is on calculating the intersections of quadric surfaces. A parametrization scheme is used. Each quadric surface intersection curve (QSIC) is represented as a set of coefficients and parameter limits. Each value of the parameter represents at most two points, and these may easily be distinguished. This scheme can find the coordinates of points of even quartic (fourth-order) intersection curves, using equations of no more than second order. Methods of parametrization for each type of QSIC are discussed, as well as surface bounding and hidden surface removal
keywords	algorithms, curves, curved surfaces, intersection, hidden surfaces, parametrization, computational geometry
series	CADline
last changed	1999/02/12 15:09

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