Selected Bibliography Architectural Graphics | Seite 107

DIAGONAL POINT METHOD
The diagonal point method for constructing aonepoint perspective uses the geometry of a45" right
triangle and the principles of convergence to make
depth measurements in perspective.

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• The technique involves establishing one side of a45"
right trianglein or parallel t othe picture plane (PP)
so that we can use it as a measuring line(ML). Along
this side(OA), we measure a length equal to the
desired perspective depth.

• Through endpoint 0 of this length, we draw the
perpendicular side that converges at the center of
vision (C).

• From the other endpoint A, we draw the hypotenuse
that converges at the vanishing point for lines
making a45" angle with the picture plane (PP).
• This diagonal marks off a perspective depth (OB)
that is equal to length OA.
A
0

h.AN VIEWS

One-Point Perspective Grid
We can use the diagonal point method to construct a
one-point perspective grid easily. Aperspective grid is
aperspective view of athree-dimensional coordinate
system.The three-dimensional network of uniformly
spaced points and lines enables usto correctly
establish the form and dimensions of an interior or
exterior space, as well to regulate the position and
size of objects within the space.

PERSPECTI VE DRAWINGS / 101