16. DIFFERENCE BTW OBJECT AND IMAGE
PARAMETER OBJECT IMAGE
INFORMATION MULTI SINGLE
VIEWPOINT CHANGED CANNOT CHANGE
CHANGE WITH
TIME
YES NO
DIMENSIONS 3D 2D
OWNERSHIP NO YES
28. Common Elements of a Projection System
• Center /Direction of Projection/
Station Point/Observers Eye
• Projection Plane/Picture Plane
• Object(s) to be projected
• Projectors/Visual Rays/Lines of Sight
30. TYPES OF PROJECTION
STATION POINT
OBJECT
PLANE OF PROJECTION
PROJECTORS
TYPE DISTANCE BTW SP & PP PROJECTORS
PERSPECTIVE FINITE RADIATING FROM STATION POINT
& INCLINED TO PROJECTION PLANE
PARALLEL INFINITE PARALLEL TO EACH OTHER &
PERPENDICULAR TO THE PLANE OF
PROJECTION
34. ISOMETRIC & ORTHOGRAPHIC PROJECTION
ORTHOGRAPHIC ISOMETRIC
MULTI VIEW SINGLE VIEW
SHOWS THE OBJECT AS 3
DIFFERENT IMAGES AS VIEWED
FROM FRONT,TOP & BACK
SHOWS THE OBJECT AS ONE
IMAGE WITH ALL THREE SIDES
WITH ALL AXIS EQUALLY
INCLINED
CAN SHOW 2DIMENSIONS ONLY CAN SHOW 3DIMENSIONS ONLY
35. WHAT SHALL WE DO?
ISOMETRIC TO ORTHOGRAPHIC
ORTHOGRAPHIC TO ISOMETRIC