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3D Sketching techniques
1. 7 DESIGN & TECHNOLOGY
PICTORIAL DRAWING
WHAT IS IT?
2. Pictorial Sketches
• A Pictorial drawing is a view of an object as it would be
seen by an observer who looks at the object either in a
chosen direction or from a selected point of view.
• Pictorial drawings often are more readily made and
more clearly understood than are front, top, and side
views of an object.
3. Oblique Drawing
• Cavalier Oblique drawings, all lines (including
receding lines) are made to their true length.
45°
4. Oblique Drawing
• In Cabinet Oblique drawings, the receding lines
are shortened by ½ their true length to
compensate for distortion and to approximate
more closely what the human eye would see.
Shorten by ½
45°
8. Isometric Drawings
• Isometric drawing is method of graphic
representation of 3D objects. The technique is
intended to combine the illusion of depth, with
the undistorted presentation of the object's
principal dimensions.
30°
30°
12. Drawing Steps – Isometric
Drawing
•
Draw border
•
Draw title block
•
Draw the horizontal baseline
•
Draw in 30° lines from a point on the baseline
•
Draw in construction box
•
Use construction lines to draw in part details then
darken lines
13. Perspective Drawing
• In Perspective Drawing objects are drawn smaller as
their distance from the observer increases. The lines of
an object are aligned to 1,2 or 3 vanishing points.
VP
VP
17. Drawing Steps – Perspective
Drawing
•
Draw border
•
Draw title block
•
Draw the horizon line
•
Place in 1,2 or 3 vanishing points
•
Draw in construction box with the edges leading to
the vanishing points
•
Use construction lines to draw in part details then
darken lines
18. Acknowledgements
• Saskatchewan Education Drafting 10
http://www.saskschools.ca/curr_content/Drafting10
• Wikipedia
http://en.wikipedia.org/wiki/Isometric_projection
• Britannica
http://www.britannica.com/eb/article9042956/isometric-drawing
