Perspective Practices, ContinuedCurves andcircles inperspectiveCurves and circles in perspective appear in true shape and size when thesurface containing the curve or circle is parallel to the picture plane. Curvesand circles on surfaces not parallel to the picture plane appear as ellipses.Ellipses have no direct transferable measurement; therefore you must placethe circle within a square. By inscribing the circle within a square, thevanishing points and proportions of the curves are easily determined.To lay out a circle in one-point perspective, use this table:StepAction1Draw a circle with the dimensions desired (figure view A).2Draw a square circumscribing the circle. Construct center lines anddiagonals inside the square. The intersections of the circle, thecenter lines, and the diagonals give you eight checkpoints fordrawing the circle in perspective (figure view B).3Draw the square in one-point perspective including the center linesand diagonals (figure view C).4Draw in the circle through the eight checkpoints (figure viewD).Continued on next page5-27
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