1. ES 101 Engineering Graphics
Gaurav Srivastava
Assistant Professor
Civil Engineering
Fall 2018

2. Theory of projections
Projections
[ ]
orthographic
projection

3. 3D  2D
This is what a camera does
Notice anything peculiar?

4. Types of Projections Oblique Multi-view Parallel Orthographic
Axonometric
Isometric
Perspective
One point
Two point
Three point

5. Perspective View Nonparallel lines of sight radiating from a point
View of object projected onto picture plane
Picture plane
Paper or Computer screen
-Observer
-Station point

6. Parallel View Parallel lines of sight radiating from a point
View of object projected onto picture plane
Picture plane
Paper or Computer screen
-Observer
-Station point

7. 3D  2D
Multiple Views

8. The most descriptive view of the object
Principal Planes X Y Z
Orthographic Projects – when the viewing planes are parallel to there principal planes
Front View
The most descriptive view of the object

9. Multiple Views

10. Multiple Views

11. Multi-view Projection

12. Multi-view Projection

13. Multi-view through Glass-box

14. Multi-view through Glass-box

15. Six principal views on glass box

16. Six principal views on glass box

18. Multi-view Projection