Graphics Programs Reference
In-Depth Information
Orthographic projections
. When all of the projector rays meet the picture plane at right
angles, the projection is an orthographic projection. Multiview and paraline drawings
are examples of this type of projection.
Oblique projections
. When all of the projector rays are parallel to one another and at
an oblique angle to the picture plane, the projection is an oblique projection. General
oblique and transoblique drawings are examples of this type of projection.
Perspective projections
. When all of the projector rays form various angles to the
picture plane and converge to a single point, the projection is a perspective projection.
One-point, two-point, and three-point perspective drawings are examples of this type
of projection.
Projection Ray
Object
Projection Ray
Object
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Projection Ray
Object
Orthographic
Projection
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Oblique
Projection
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Perspective
Projection
Figure 1.2
Types of projections
Types of 3D Drawings
It will be helpful to briefly discuss some of the more common types of 3D drawings
used by designers, artists, and architects. In some cases, the drawings are roughly
sketched out by designers without the use of a formal projection system. In others,
they might be carefully constructed or generated with 3D software.
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