The RGPV Survivor’s Guide to Unit 2
Projection of Points & Lines - The Art of Shadows
Your friendly tutor chetan
First Year B.Tech Special Edition
1 Introduction: The Shadow Realm
Welcome to Unit 2. If Unit 1 was about drawing shapes, Unit 2 is about Projection. Basically,
we are drawing 3D objects on 2D paper.
The Motivation: Imagine you are designing a missile. You can’t just draw a stick figure and
write ”boom” next to it. You need to show exactly how it looks from the front, top, and side so
the manufacturer doesn’t build a submarine by mistake.
Pro Tip: In Engineering Graphics, ”Projection” does not mean projecting your insecurities
onto others. It means throwing an image onto a plane.
2 The Basics: First Angle vs. Third Angle
RGPV (and India) follows the First Angle Projection method.
- Object Position: The object is placed in the First Quadrant (between the observer and
the plane).
- Logic: Imagine you are shining a flashlight on an object. The shadow falls on the wall
behind it.
- The Golden Rule:
- Front View (FV): Drawn ABOVE the XY line.
- Top View (TV): Drawn BELOW the XY line.
WARNING: Do NOT use Third Angle Projection (USA style). If you draw Top View above
the XY line, the examiner will cry, and then give you zero.
3 Topic 1: Projection of Points (The Fly in the Room)
Imagine your room is the quadrant system.
- The Floor is the Horizontal Plane (HP).
- The Wall in front of you is the Vertical Plane (VP).
- A Fly is buzzing around. That Fly is the Point.
Projection of Points & Lines - The Art of Shadows
Your friendly tutor chetan
First Year B.Tech Special Edition
1 Introduction: The Shadow Realm
Welcome to Unit 2. If Unit 1 was about drawing shapes, Unit 2 is about Projection. Basically,
we are drawing 3D objects on 2D paper.
The Motivation: Imagine you are designing a missile. You can’t just draw a stick figure and
write ”boom” next to it. You need to show exactly how it looks from the front, top, and side so
the manufacturer doesn’t build a submarine by mistake.
Pro Tip: In Engineering Graphics, ”Projection” does not mean projecting your insecurities
onto others. It means throwing an image onto a plane.
2 The Basics: First Angle vs. Third Angle
RGPV (and India) follows the First Angle Projection method.
- Object Position: The object is placed in the First Quadrant (between the observer and
the plane).
- Logic: Imagine you are shining a flashlight on an object. The shadow falls on the wall
behind it.
- The Golden Rule:
- Front View (FV): Drawn ABOVE the XY line.
- Top View (TV): Drawn BELOW the XY line.
WARNING: Do NOT use Third Angle Projection (USA style). If you draw Top View above
the XY line, the examiner will cry, and then give you zero.
3 Topic 1: Projection of Points (The Fly in the Room)
Imagine your room is the quadrant system.
- The Floor is the Horizontal Plane (HP).
- The Wall in front of you is the Vertical Plane (VP).
- A Fly is buzzing around. That Fly is the Point.
