Quadrilateral Perspective


Geometric structure:- First of all, draw the horizon and the width measurement lines. The distance between the two lines is the height where the viewer is located.

See figure nº 31 (next page).

In this graph, the distance is 5.6cm, which is the equivalent to a distance of 28m on the scale 1:500.

Draw a perfectly geometric square with equal sides on the width line. This is the where the focused vision is located. On the measurement line, in the middle of this square, upwards direction, mark the vanishing point 1 on the horizon line. From the same point on the measurement line, downwards direction, calculate the distance the viewer is located and mark the vanishing point 2. In this case it is 11.4cm, which is equivalent to 52cm.

Now, find the depth point on the horizon line. It is far from the vanishing point 1 in the same proportion existing between vanishing point 1 and vanishing point 2.

Please note that in this case, the distance between the focused and out-of-focus vision is not 17cm, but 52m, because the eyes are focusing the distant image, within the space called accommodation range.

Draw a vertical line at the far end of the width measurement line. We may consider it the imaginary line that will transfer the measurements to the height measurement line in perspective.


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