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# Theory of projection

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A basic introductory class to Theory of Projection with a specific focus on Anna University first year students handling Engineering Graphics

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### Theory of projection

1. 1. THEORY OF PROJECTION
2. 2. WHO HAS THE EYE?
3. 3. SOMETHING MAJESTIC
4. 4. SOMETHING MESMERISING
5. 5. SOMETHING SURPRISING
6. 6. SOMETHING SHOCKING
7. 7. SOMETHING TRANQUILLING
8. 8. SOMETHING TERRIFYING
9. 9. SOMETHING ELSE
10. 10. SOMETHING ELSE
11. 11. SOMETHING ELSE
12. 12. SOMETHING ELSE
13. 13. SOMETHING ELSE
14. 14. UNDERSTANDING OBJECT & IMAGE
15. 15. UNDERSTANDING OBJECT & IMAGE
16. 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
17. 17. SIZE DOES MATTER
18. 18. DIFFERENTIATE
19. 19. DIFFERENTIATE
20. 20. DIFFERENTIATE
21. 21. THE 2D – 3D PROBLEM 2D – Engineers 3D - Customers
22. 22. THE 2D – 3D PROBLEM 2D – Engineers 3D - Customers
23. 23. THE 2D – 3D PROBLEM 2D – Engineers 3D - Customers
24. 24. THE 2D – 3D PROBLEM 2D – Engineers 3D - Customers
25. 25. THE 2D – 3D PROBLEM 2D – Engineers 3D - Customers
26. 26. EXPLAINING PROJECTION OBJECT IMAGE PROJECTION OBSERVER
27. 27. EXPLAINING PROJECTION PROJECTION IS THE PROCESS OF OBTAINING _______ __________________________ FROM _______ __________________________
28. 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
29. 29. Classification of Projection
30. 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
31. 31. TYPES OF PROJECTION
32. 32. TYPES OF PROJECTION
33. 33. WHAT PROJECTION IS THIS?
34. 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. 35. WHAT SHALL WE DO? ISOMETRIC TO ORTHOGRAPHIC ORTHOGRAPHIC TO ISOMETRIC
36. 36. PRACTICE ISO TO ORTHO #1 FRONT VIEW SIDE VIEW TOP VIEW
37. 37. PRACTICE ISO TO ORTHO #2
38. 38. PRACTICE ISO TO ORTHO #3