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# 3D Sketching techniques

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### 3D Sketching techniques

1. 1. 7 DESIGN & TECHNOLOGY PICTORIAL DRAWING WHAT IS IT?
2. 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. 3. Oblique Drawing • Cavalier Oblique drawings, all lines (including receding lines) are made to their true length. 45°
4. 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°
5. 5. Example of an Oblique Drawing
6. 6. Example of an Oblique Drawing
7. 7. Example of an Oblique Drawing
8. 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°
9. 9. Example of an Isometric Drawing
10. 10. Example of an Isometric Drawing
11. 11. Example of an Isometric Drawing
12. 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. 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
14. 14. Example of a Perspective Drawing
15. 15. Example of a Perspective Drawing
16. 16. Example of a Perspective Drawing
17. 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. 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