1. GANDHINAGAR INSTITUTE OF TECHNOLGY
Department of Information Technology
Parallel and Perspective Projection in 3D
Group ID: IT_B2
Student Name(Enroll No): Shaishav Shah(170120116094)
Name of Faculty: Prof. Swapnil Panchal
Computer Graphics (2151603)
2. Contents
Overview of 3D Projection.
Types of 3D Projection.
Brief introduction to Parallel projection.
Introduction to Perspective Projection.
What is Vanishing point ??
Types of Perspective Projection.
References.
Conclusion.
3. Overview of 3D Projection:
Projection is a method of mapping a 3 dimensional object into a 2
dimensional view plane.
Mapping is determined by the projection line called Projector.
4. Types of 3D Projection:
Two types of projections are there.
Those are Perspective projection and Parallel projection.
Projection Reference Point(PRP) or Center of Projection point
is a point, where projection lines converges.
5. Brief introduction to Parallel projection:
In parallel projection, projection lines are parallel to each other.
Image on the view plane of the object will be equal size with the
object.
6. Projection Reference Point(PRP) lies in infinite position.
Different types of parallel projection are given bellow:
7. Introduction to Perspective Projection:
Projection lines are drawn from the object point towards view plane.
8. Image of the object in the view plane is smaller than the real object.
PRP lies in finite position.
Realistic image relative proportion could not be preserved.
Commonly used by artists and the designers.
9. What is Vanishing Point:
Parallel lines that are not parallel to the viewing plane, converges to a
Vanishing Point.
10. Types of Perspective Projection:
Three types of Perspective Projection are there.
One Principal Vanishing Point Perspective Projection.
Two Principal Vanishing Point Perspective Projection.
Three Principal Vanishing Point Perspective Projection.
11. One Principal Vanishing Point Perspective
Projection:
This Perspective projection occurs when the projection plane intersect
to one of the Principal axis(x, y or z).
13. Two Principal Vanishing Point Perspective
Projection:
This Perspective projection occurs when the projection plane
intersects exactly any two of the Principal axis(x, y or z).
15. Three Principal Vanishing Point Perspective
Projection:
This Perspective projection occurs when the projection plane
intersects to all the three Principal axis(x, y and z).
18. Conclusion:
“Clearly, if wed had the kind of computer graphics
capability then that we have now, the Star Gate sequence
would be much more complex than flat planes of light
and color.”
- Douglas Trumbull.
https://www.youtube.com/watch?v=ebmwYqoUp44&t=125s