1. Oblique Sketches
(Material developed by Project Lead the Way)

2. Oblique Pictorials
An Oblique pictorial starts with a straight-on view of one of the object’s faces, which is often the front face.
Angled, parallel lines are drawn to one side to represent the object’s depth. Common oblique angles include 30°, 45°, and 60°.
45°

3. Types of Oblique Drawings
There are two types of oblique pictorials: cavalier and cabinet. The difference between the two is based on how the depth of the object is represented.
Oblique Cavalier
Oblique Cabinet

4. Types of Oblique Drawings
Oblique Cavalier
Oblique Cabinet

5. General Oblique
A general oblique is a type of oblique pictorial that represents an object’s width and height, but the depth can be any size and drawn at any angle.
The idea is to worry about getting the thought down as a sketch not worrying about the depth or angle.

6. The Box Method
The box method is a sketching technique that is used to maintain proportionality. It starts with the sketcher envisioning an object contained within an imaginary box.

7. Oblique Sketches
Step #1: Layout the box within which the oblique view will occur using points and construction lines.

9. Oblique Sketches
Step #2: Use points and construction lines to identify edges that occur on the surface of the box.

11. Oblique Sketches
Step #3: Trace out the visible edges of the part with thick, dark object lines.

13. Oblique Sketches
Step #4: Use points and construction lines to identify edges that occur on the surface of the box.

15. Oblique Sketches Step #5: Trace out the visible edges of the
part with thick, dark object lines.

17. Tonal Shading
Add tonal shading to two of the three views by drawing parallel lines spaced closely together.
Increase the contrast by cross-hatching the lines on the darkest face.