of Object Features OBJECT FEATURES Edges are lines that represent the boundary between two faces Corners Represent the intersection of two or more edges Edge Corner Edge No edge No corner ID: 288121
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Slide1
Orthographic Projectionof Object FeaturesSlide2
OBJECT FEATURES
Edges
are lines that represent the boundary
between two faces.
Corners
Represent the intersection of two or
more edges.
Edge
Corner
Edge
No edge
No corner
No cornerSlide3
Surfaces
are areas that are bounded by edges
or limiting element.
Limitingelement
is a line that represents the last visible
part of the curve surface.
Surface
Surface
Surface
Limit
Limit
OBJECT FEATURESSlide4
A
B
PROJECTION OF POINT(S)
A
F
B
R
A
T
B
F
A
R
B
T
A
F
A
R
A
T
B
F
B
R
B
T
Equal
distanceSlide5
A
B
A
F
B
F
B
R
A
R
A
T
B
T
B
R
A
R
A
F
B
F
A
T
B
T
True length
NORMAL LINE
True length
Point
Equal
length
PROJECTION OF LINESlide6
A
B
A
F
B
F
B
R
A
R
A
T
B
T
INCLINED LINE
Foreshortened
B
R
A
R
A
F
B
F
Foreshortened
A
T
B
T
True length
A
Equal
length
PROJECTION OF LINESlide7
A
B
A
F
B
F
B
R
A
R
A
T
B
T
OBLIQUED LINE
A
Equal
length
B
Foreshortened
Foreshortened
Foreshortened
B
R
A
R
A
F
B
F
A
T
B
T
PROJECTION OF LINESlide8
B
C
A
PROJECTION OF PLANE
B
F
A
F
,C
F
C
R
A
R
,B
R
A
T
C
T
NORMAL PLANE
Equal
length
Edge
Edge
True size
C
R
A
R
,B
R
A
F
,C
F
B
F
A
T
B
T
C
T
B
TSlide9
B
C
B
F
A
F
C
R
A
R
,B
R
A
T
C
T
INCLINED PLANE
A
Equal
length
B
T
C
C
F
Edge
C
R
A
R
,B
R
Foreshortened
B
T
C
T
A
T
A
F
C
F
Foreshortened
B
F
PROJECTION OF PLANESlide10
B
C
B
F
A
F
C
R
A
R
A
T
C
T
OBLIQUED PLANE
A
Equal
length
B
T
C
C
F
B
B
R
Foreshortened
C
R
A
R
B
R
A
F
B
F
C
F
Foreshortened
A
T
B
T
C
T
Foreshortened
PROJECTION OF PLANESlide11
PROJECTION OF OBJECT
The views are obtained by projecting all object features to the picture plane.
You have to project the remaining surfaces which are
Invisible !Slide12
s
s
s
PROJECTION OF OBJECTSlide13
PROJECTION OF OBJECT