HOW
TO DRAW A SPIRAL STAIRCASE IN PARALLEL PERSPECTIVE
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Draw
the distance, support and horizon lines and the vanishing, view
and depth points inside the visual field, as previously explained.
Draw a square corresponding to the diameter of the staircase and
divide it into angles of 45º. Find the bisectrix of these
45º angles as follows: Multiply the length of the angle by
the expression 0.586. Figure nº 25 illustrates a square of
10x10cm (2 x 2 m in a scale of 1:20). In this case, the length
of the angle is 5cm |
-
multiply it by 0.586
0.586
x 5 = 2.930
round up to 3 cm
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Mark
3 cm on the square base (width measurement line) starting at each
vertex. See figure nº 25. From this point to the vanishing
and depth points, find the lateral 3 cm and so forth. After finding
the points on the square edges join these points with the lines
that will pass by the perspective center of the square. |
Now
you have all the angles of the staircase steps already in perspective.
Figure
nº 26 shows a circle drawn on the angles of the steps.
Figure
nº 27 shows the raising of the steps within a box.
Figure
nº 28 shows the spiral staircase already constructed.
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