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During the Renaissance, European artists began to study the model of nature more closely and to paint with the goal of greater realism. They learned to create lifelike people and animals, and they became skilled at creating the illusion of depth and distance on flat walls and canvases by using the techniques of linear perspective. Leonardo da Vinci trained as a painter during the Renaissance and became a true master of the craft. His amazing powers of observation and skill as an illustrator enabled him to notice and recreate the effects he saw in nature, and added a special liveliness to his portraits. Curious as well as observant, he constantly tried to explain what he saw, and described many experiments to test his ideas. Because he wrote down and sketched so many of his observations in his notebooks, we know that he was among the very first to take a scientific approach towards understanding how our world works and how we see it. During the Renaissance in Italy, architects and artists investigated the question of how to draw three dimensional objects on flat surfaces. They began to think of a painting as an "open window" through which the viewer sees the painted world. They also developed a system of mathematical rules known as linear perspective to help painters achieve their goal of realism. Leonardo learned the rules of perspective and practiced using the window as a device for drawing perspective correctly while he was an apprentice in Verrochio's studio. Da Vinci and Linear Perspective Linear perspective is a mathematical system for creating the illusion of space and distance on a flat surface. The system originated in Florence, Italy in the early 1400s. The artist and architect Brunelleschi demonstrated its principles, but another architect and writer, Leon Battista Alberti was first to write down rules of linear perspective for artists to follow. Leonardo da Vinci probably learned Alberti's system while serving as an apprentice to the artist Verrocchio in Florence. To use linear perspective an artist must first imagine the picture surface as an "open window" through which to see the painted world. Straight lines are then drawn on the canvas to represent the horizon and "visual rays" connecting the viewer's eye to a point in the distance. The horizon line runs across the canvas at the eye level of the viewer. The horizon line is where the sky appears to meet the ground. The vanishing point should be located near the center of the horizon line. The vanishing point is where all parallel lines (orthogonals) that run towards the horizon line appear to come together like train tracks in the distance. Orthogonal lines are "visual rays" helping the viewer's eye to connect points around the edges of the canvas to the vanishing point. An artist uses them to align the edges of walls and paving stones. In this study for Adoration of the Magi, Leonardo has carefully drawn all of the lines needed to create perspective before sketching in all the figures. Look carefully and see if you can find the horizon line, orthogonals, and vanishing point.