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Chapter 7 The Illusion of Space and Conical Shapes

Chapter 7 The Illusion of Space and Conical Shapes. Objectives (1 of 2). Create the illusion of space in drawing by using relative size, vertical placement on the page, overlapping of objects, and contrast in values. Establish a foreground, middle ground, and background in drawings.

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Chapter 7 The Illusion of Space and Conical Shapes

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  1. Chapter 7The Illusion of Space and Conical Shapes

  2. Objectives (1 of 2) • Create the illusion of space in drawing by using relative size, vertical placement on the page, overlapping of objects, and contrast in values. • Establish a foreground, middle ground, and background in drawings.

  3. Objectives (2 of 2) • Perceive the underlying conical shape of many everyday objects. • Create an accurate line drawing of a cone whether it is standing upright or lying on its side. • Render the volume of a conical object using shading.

  4. The Illusion of Space • Foreground: nearby • Background: far away • Middle ground: in between

  5. Creating the Illusion of Space (1 of 2) • Relative size: smaller says “farther” • Placement: closer to horizon line says “farther”

  6. Creating the Illusion of Space (2 of 2) • Overlapping: partially obscured says “farther” • Value contrast: smaller range of values says “farther” • INSERT FIG 7-05

  7. Upright Cones (1 of 2) • Draw a vertical center guide line to keep your cone from becoming lopsided.

  8. Upright Cones (2 of 2) • Draw a horizontal plumb line to determine the shape of the ellipse.

  9. Cones on Their Sides • Draw a center guide line from tip through the widest part of the ellipse. • Draw a perpendicular line through the widest part of the ellipse.

  10. Volume in Cones • Areas of greatest contrast are those closest to the viewer’s eye. • Sight and measure to determine shape and angle of cast shadow.

  11. Summary (1 of 2) • Establish the illusion of space between objects for accurate drawing. • Larger objects appear closer to the viewer’s eye than smaller objects. • Objects lower in the picture plane appear closer. • An object that overlaps another object appears closer. • Objects with a greater range of values appear closer.

  12. Summary (2 of 2) • The cone is one of the four basic shapes. • Begin with a central guide line in order to draw a cone accurately. • When a cone is lying on its side, add a perpendicular guide line for the widest part of the ellipse. • The volume of the cone is essentially round. • Use values to suggest volume as for a sphere.

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