Ask the Chatbot Games & Quizzes History & Society Science & Tech Biographies Animals & Nature Geography & Travel Arts & Culture ProCon Money Videos
sight line
References
Images
Projective drawingThe sight lines drawn from the image in the reality plane (RP) to the artist's eye intersect the picture plane (PP) to form a projective, or perspective, drawing. The horizontal line drawn parallel to PP corresponds to the horizon. Early perspective experimenters sometimes used translucent paper or glass for the picture plane, which they drew on while looking through a small hole to keep their focus steady.
Britannica AI Icon

sight line

mathematics and art
Written by
The Information Architects of Encyclopaedia Britannica

The Information Architects maintain a master list of the topics included in the corpus of  Encyclopædia Britannica, and create and manage the relationships between them.
The Information Architects of Encyclopaedia Britannica
Last updated

Quick Summary

Projective drawingThe sight lines drawn from the image in the reality plane (RP) to the artist's eye intersect the picture plane (PP) to form a projective, or perspective, drawing. The horizontal line drawn parallel to PP corresponds to the horizon. Early perspective experimenters sometimes used translucent paper or glass for the picture plane, which they drew on while looking through a small hole to keep their focus steady.
Projective drawing

The sight lines drawn from the image in the reality plane (RP) to the artist's eye intersect the picture plane (PP) to form a projective, or perspective, drawing. The horizontal line drawn parallel to PP corresponds to the horizon. Early perspective experimenters sometimes used translucent paper or glass for the picture plane, which they drew on while looking through a small hole to keep their focus steady.

A sight line is a line extending from an observer's eye to a viewed object or area. In mathematics and art, this concept is fundamental to perspective drawing, a method developed during the Renaissance by artists like Filippo Brunelleschi and Leon Battista Alberti.123

This technique uses sight lines to project a three-dimensional scene onto a two-dimensional plane, creating the illusion of depth. The eye of the artist is connected to points in the landscape by these sight lines, which intersect a vertical picture plane to form the drawing. This mathematical approach, known as projective geometry, deals with the relationships between geometric figures and their projected images.2

Summary created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
6 Britannica Sources
  1. sight line
  2. projective geometry
  3. perspective
  4. drafting - Perspective
  5. human eye - The directions of lines
  6. human eye - Comparison of lengths

Ask Britannica AI about this topic

Britannica doesn't have a full article on this topic, so we've curated a list of our relevant coverage.