authors 
Reggini, Horacio C. 
year 
1975 
title 
Perspective Using Curved Projection Rays and its Computer Application 
source 
Leonardo. England: Pergamon Press, 1975. vol. 8: pp. 307312 : ill. includes bibliography 
summary 
The author describes a novel way for generating line drawings of 3dimensional objects and describes a computer program that he used in plotting such drawings. Instead of being confined by the rules of linear perspective, which governs retinal and photographic images, he employs a more general mathematical model that provides a family of perspectives. Each member of the family is designated individually by a numerical value (between 0 and 1) for its index i. The lowest value, i=0, leads to the linear equation that applies to linear perspective; application of the highest value, i=1, results in axonometric projection. Sometimes linear perspective leads to a drawing or to a photographic image that seems grossly distorted in comparison with what one perceives in looking at an object. The author's method, employed with fractional values for i and with the same viewpoint, may be used to produce more acceptable drawings 
keywords 
drawings, perspective, rendering, computer graphics, projective geometry 
series 
CADline 
references 
Contenttype: text/plain

last changed 
2003/06/02 11:58 
