Orthographic Projection

“COPY”

Representational drawing and sketching:

• Is concerned with "drawing what you see," or "drawing that which you imagine as if you actually saw it."

• *(Sketch of garden shed)

“COPY”

Technical drawing:

• Is concerned with representing objects according to drawings that allow for:

Size, proportions, and structure - as well as appearance - to be shown.

• The most basic concept involved is the geometry of "projection."

“COPY”

• An orthographic projection drawing - since it is a "flattened single view" of a (3-D) 3 dimensional object - is an "exactly sized" representation of the real object on a 2 dimensional surface (paper) AS SEEN IN THAT VIEW.

** Name these views: (6)

*This process is called orthographic ("true drawing")

projection.

“COPY”

*It also works in reverse: “Don’t copy”

• a) If you correctly draw the individual views

• b) Fold them all up into a box with 90 degree corners

• c) Then project the corners of each drawing into the middle of the box the intersections of those lines will define the 3 dimensional object.

Proper Blocking Format“Copy”

Top View

Front View

Side View

Line of Deflection

Isometric DrawingsOrthographic Projections

Garden Sheds

• On a full size piece of white paper

• Reproduce a 3D Isometric Drawing

• Extract as much detail as possible

• Landscape included

• Draw the 3 OP’s

OP 1 - 10

• Use the 3D isometric object to produce the 3 OPs (top, front, side)

• Use the grid system to keep all sizes and proportions correct.