Amogh N P
✦ In loving memory of Amogh N P — Architect · Designer · Visionary ✦
Pictorial Systems: An Overview of Projection — Multiview, paraline, and perspective compared
Lesson 07Module 2 · The language of design drawing

Pictorial Systems: An Overview of Projection

Multiview, paraline, and perspective compared

2.5 hours (seminar + studio)

Learning objectives

By the end of this lesson, students will be able to:

  • Classify the three families of projection — orthographic/multiview, paraline, and perspective — by how projectors meet the picture plane.
  • Match each system to its communicative strength: measurable accuracy, volumetric clarity, or experiential realism.
  • Read one simple building presented in all three systems and explain what each view reveals and conceals.
How projectors strike the picture plane PARALLEL projectors — paraline / orthographic picture plane object perpendicular = orthographic oblique & parallel = paraline Projectors stay parallel — they never meet; true size is preserved. CONVERGING projectors — perspective picture plane object observer (eye / station point) image on plane Projectors converge to a single eye point — distant things project smaller.
DiagramParallel vs. converging projectors striking a picture plane.
One pavilion, five drawing systems A simple open shelter: square plan, four posts, a pitched roof. plan horizontal cut; posts = poché section vertical cut; cut line heaviest elevation true face; consistent 45° shadow isometric verticals vertical; axes at 30° 2-point perspective VP VP edges converge to VPs on horizon
DiagramOne pavilion in plan, section, elevation, isometric, and two-point perspective.
Which drawing system? — a decision flowchart What do you need to communicate? measurable accuracy exact sizes, for building & checking dimensions multiview plan · section · elevation flat, true-scale faces whole volume at once show the 3-D object, still measurable paraline isometric · axonometric parallel, true dimensions lived experience how the space looks & feels to the eye perspective one · two · three point converging, eye-level view Pick by purpose, not habit: build it (multiview) · grasp the form (paraline) · sell the experience (perspective).
DiagramWhat do you need to communicate? A drawing-system decision flowchart.
The lamp-and-glass projection demonstration.
PhotoThe lamp-and-glass projection demonstration.
A study model — the object every system describes.
ReferenceA study model — the object every system describes.

Key concepts

  • Projection as the geometric bridge between a 3D object and a 2D drawing: parallel vs. converging projectors, perpendicular vs. oblique to the picture plane.
  • Multiview drawings preserve true measurements but fragment the object; paraline drawings keep the whole volume but distort experience; perspective matches experience but sacrifices measurability.
  • Drawing conventions as a shared language: why a plan in Bengaluru is readable in Berlin.
  • Choosing a system is a rhetorical decision — what do you need the viewer to understand?

In-class activities & exercises

Projection demonstration (30 min)Instructor uses a cardboard model, a lamp, and a glass sheet to physically cast orthographic and perspective projections.
System safari (40 min)Students receive one small pavilion design shown as plan, section, isometric, and perspective, and annotate what each view tells them.
First translations (50 min)From a dimensioned isometric of a simple stepped form, students produce its plan and front view freehand.
Discussion (20 min)Which system would you choose to explain this pavilion to a builder? To a client? To yourself?

Worked example sketches

How the technique looks in practice — loose, hand-drawn examples. Scroll to watch each one draw in; click to zoom.

One pavilion, three ways plan isometric perspective
DiagramA small pavilion sketched as plan, isometric and perspective together.
Teapot — ortho & iso front top isometric
DiagramA teapot in orthographic views beside its isometric.
Stepped form → plan + front isometric plan (from above) front
DiagramA stepped form translated from isometric to plan and front view.
One chair, three ways plan front elevation isometric same chair — three projections
DiagramA chair in plan, elevation and isometric together.

Homework / studio assignment

Find any building product brochure or instruction sheet; identify and label every projection type used and write three sentences on why each was chosen.

Assessment

Annotation quality in the system safari; correctness of the translation exercise.