Given the plan and elevation of a cottage.

Draw in the picture plane and the spectator point.

Draw in the horizon line and the ground line.

From the station point, draw a line parallel to the side of the cottage until it strikes the picture plane. From this point drop a line down to the horizon line to establish the right-hand vanishing point.

Repeat the previous step to establish the left-hand vanishing point.

Drop a line from the corner ab down to the ground line. As the line ab touches the picture plane it is a true length in perspective.

Connect ab to the two vanishing points to establish the front receding walls of the cottage.

Draw a line of sight from the spectator to cd in plan. Where this line of sight cuts the picture plane drop a vertical line which will indicate the depth of the receding wall in perspective.

Repeat the previous step for the line ef.

Draw in the front receding walls of the cottage.

A height line may be use to find the height of the apex (gh) of the cottage. Extent the line gh in plan until it reaches the picture plane. From here drop a line perpindicular to the picture plane. From the ground line step up the height h.

Draw a line from the right-hand vanishing point to the height h. Drop the points g and h down perpindicular to the picture plane to meet the line.

Complete the roof of the cottage.

Extend the line ag and ch back until they meet. They meet directly above VPL. This new point is known as an auxiliary point.

Divide the leading edge ab into five equal parts.

Vanish each of these points back to the right-hand vanishing point.

Draw a diagonal line from b to c. This divides the line ac into five equal segments as shown.

Bring each of these points back to the auxiliary vanishing point.

Draw in the roof tiles in perspective. Note: when drawing inclined lines in perspective an auxiliary vanishing point will be of great assistance.