Eg2
Download as PPT, PDF
0 likes53 views
This document discusses projection theory and different types of projections. It defines a projection as mapping a 3D space onto a 2D subspace, with the 2D space called the projection plane. Projections are classified as either perspective or parallel projections, depending on whether they use a single center of projection or parallel lines of projection. Common elements of any projection system include the center of projection, projection plane, objects to be projected, and projectors (sightlines).
Eg2
- 1. Projection Theory Perspective and Parallel Projections
- 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
- 6. Projection Theory Perspective and Parallel Projections
- 7. Projection Theory Perspective and Parallel Projections