2. Projection Theory
A projection is a mapping of a 3D space onto a 2D subspace
2D space is called the projection plane
Projection also refers to image resulting from such a
mapping
3. Classification of Projections
O n e - p o in t
T w o - p o in t
T h r e e - p o in t
P e r s p e c t iv e
P r o je c t io n
C a v a lie r
C a b in e t
G e n e r a l
O b liq u e
I s o m e t r ic
D im e t r ic
T r im e t r ic
A x o n o m e t r ic M u lt iv ie w
O r t h o g r a p h ic
P a r a lle l
P r o je c t io n
P r o je c t io n T h e o r y
4. Common Elements of a Projection
System
Center of Projection
(Perspective)/Direction
of Projection (Parallel)
Projection Plane
Object(s) to be
projected
Projectors
5. Some Terminology
Bounding Box = Principal Enclosing Box
(PEB)
Center of Projection = Station Point =
Viewpoint of observer
Projection Plane = Viewplane = Picture
Plane
Projectors = Sightlines = Line of Sight
