Perspective Practices, ContinuedInclined linesand planesLines and planes inclined toward or away from the picture plane havevanishing points similar to horizontal vanishing points. When constructingperspective drawings from plan and elevation views, locating the vanishingpoints for the inclined lines involves further preliminary projection.To find the vanishing points of inclined lines in two-point perspective, usethis table:Step1ActionPlace the picture plane, horizon line, and ground line as donepreviously in the mechanical construction of perspective drawings.2the vertical lines AB and CD through the horizontalvanishing points (VPR and VPL). The vanishing points forinclined lines and surfaces will fall these lines. Note thatwhen you view an object, all inclined planes should project to theright. which means that all their vanishing points fall to the right ofvertical line CD (figure 5-19, view A).3Using the line from the station point to where it intersects thepicture plane (SPY), construct angle a equal to the angle made bythe inclined plane 1234 and the picture plane in the elevation view.this line beyond line CD (figure 5-19, view 45Construct a perpendicular to this line intersecting CD at Y.Using a compass or dividers, lay off this perpendicular distance onCD from the right vanishing point. This is VPRl for the inclinedplane 1234.6Proceed with this method for the remaining inclined planes toobtain VPR2 and VPR3 (figure 5-19, view C).7Finish and darken the object outline.You can find the perspectives of inclined lines without finding the vanishingpoints by finding the perspectives of the end points and joining them. Youcan determine the perspective of any point by finding the perspectives of anytwo lines intersecting at the point.Continued on next page5-25

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