ELEMENTS
INVOLVED IN
ORTHOGRAPHIC
PROJECTION
DIMENSIONS OF AN OBJECT
Zero Dimension -
In finding the dimension of an object we need to find first
the Length, Width and Height of the object.
• Length, Width and Height are adjectives that allows us to
indicate the volume of geometric bodies.
• The Length and Width correspond to the horizontal
dimension,
On the other hand, Height refers to the vertical dimension.
we usually express these dimensions by writing the out
separated by a multiplication sign.
(W x L x H)
OBSERVER
• A line can appear differently depending upon the position of the
observer,
• If the observer views the surface such that the lines of sight are parallel to
the plane, he/she will see the plane as a single line.
• If the observer views the surface such that the lines of sight are
perpendicular to the plane, he/she see the plane in its true size and shape.
There are infinite number of views where the surface will appear
foreshortened. The plane will appear foreshortened in any views where
the surface is neither parallel nor perpendicular to the projection plane.
Plane of Projection/Picture Plane
• Plane of Projection also called Viewing Plane or the
Picture plane
- it is the plane onto which the image of an object is
projected.
Plane of Projection
Example:
VISUAL RAYS
-An
infinite number of parallel theoretical
projectors which emanate from an object, to form the
image of the object on the projection plane.
THANK YOU!!!!!!
REPORTED BY:
VANESSA KRIZL
M. MAWAC