Fig. B-3 shows the outline plan and elevation of a greenhouse, based on the graphic on the right - Leaving Cert DCG - Question B-3 - 2015

Identify and mark the spectator point, which is 4.5m from corner A on your plan drawing. Draw the picture plane touching corner A, making sure that it is vertical in alignment.

Mark two vanishing points (VP1 and VP2) on your drawing. These should be positioned based on the perspective lines extending from the edges of the greenhouse and should align with the spectator point.

Draw the ground line on your perspective drawing and place the horizon line at 3.25m above this line. Ensure that the vanishing points remain in line with this horizon line.

From each corner of the greenhouse in your plan, draw projection lines extending towards the spectator point, ensuring these lines are angled appropriately to create depth.

From where the projection lines meet the horizon line, draw the base outlines of the greenhouse, ensuring that the edges converge correctly towards the vanishing points.

Using the provided dimension, measure the height of front corner A from the ground line, and project this height upwards to connect with your perspective drawing.

Determine the slant of the roof structure to find its 'bottom' edge by projecting lines from the appropriate corners towards the vanishing points.

If necessary, establish any additional vanishing points that may arise from elements of the greenhouse that do not align with the primary two vanishing points.

Finalize your perspective drawing by ensuring all lines are connected, and the shapes of the greenhouse, including the door and window, are accurately represented. Add details only to the extent required.

In the plan view, indicate the door in an open position, showing its orientation after it has been swung open perpendicular to the wall.

On your perspective drawing, illustrate the vertical edge of the door after it has been opened, ensuring a clear representation of its new position.

Draw the top and bottom edges of the door in their new positions, making sure they are correctly aligned with the open door representation.

In your perspective drawing, represent the roof window in an opened position, illustrating the two sloping edges and the horizontal edge created as the window opens through an angle of 70°.