Perspective Drawing

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Placing a "bridging" pencil over the lower left pencils and "filling in" the other two to create an opaque plane (below) results in two new top shade lines. These lines cast shadows parallel to themselves. The parallel set at lower left, being parallel to picture plane, remain parallel in perspective. The parallel set at right converge to the horizon. RULE: As in the case of parallel rays (sunlight) a straight line casting a shadow on a parallel surface casts a shadow parallel to itself.

Placing a "bridging" pencil over the lower left pencils and "filling in" the other two to create an opaque plane (below) results in two new top shade lines. These lines cast shadows parallel to themselves. The parallel set at lower left, being parallel to picture plane, remain parallel in perspective. The parallel set at right converge to the horizon. RULE: As in the case of parallel rays (sunlight) a straight line casting a shadow on a parallel surface casts a shadow parallel to itself.

Drafting Cast Shadows
TOP view

Now let us again build two cubes using the existing planes as one side of each (below). This creates three new shade points (1,2,3) which cast shadows points Is, 2s, 3s. The three new top shade lines again cast shadows parallel to themselves. Therefore, in perspective, these shadows will converge to the vanishing points of their shade lines. (Note how the location of the light creates three top shade lines on one cube but only two on the other.)

The Following Application Sketches Have Shadows Cast By Local Light Sources [95]

j Therefore, the principles developed on the previous page will be evident.

Note: Single-arrowed lines are diverging light rays used to locate shadows.

Dotted lines are guidelines which "project" the light source onto the various surfaces (walls, floor, table top, etc.). They originate from the light source and are drawn perpendicular to the surfaces. (The projected light sources are marked by asterisks.)

Double-arrowed lines (originating from the asterisks) are the guidelines that determine the directions of shadows cast by shade lines perpendicular to a given surface.

Double-arrowed lines (originating from the asterisks) are the guidelines that determine the directions of shadows cast by shade lines perpendicular to a given surface.

Perspective Drawing Shadows TableCourtesy The Cooper Union Museum

18th-century drawing, artist unknown. Courtesy of the Cooper Union Museum

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Responses

  • Emmanuel
    How to draw triangles shadows in perspective?
    8 years ago
  • summer
    Does isometric lines are used to make shadows?
    3 years ago

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