SKETCHING

1. SKETCHING A sketch is a rapidly executed freehand drawing that is not intended as a finished work. In general, a sketch is a quick way to record an idea for later use. Artist's sketches primarily serve as a way to try out different ideas and establish a composition before undertaking a more finished work, especially when the finished work is expensive and time consuming. Sketching sharpens an artist's ability to focus on the most important elements of a subject and is a prescribed part of artistic development for students.

2. Sketches can highlight important information

3. We can use sketches to transfer information to a workspace…

4. Understanding Sketching Techniques • Analyzing complex objects • The ability to break down complex shapes into simpler geometric primitives is an essential skill for sketching and modeling objects • Basic curves and straight lines are the basis of many objects

5. Understanding Sketching Techniques • Essential shapes can be blocked in using construction lines

6. Understanding Sketching Techniques • Contours show the contrast between positive and negative space

7. Viewpoint • As you sketch, you should maintain a consistent viewpoint • Examine the shapes you see from that viewpoint • Sketch the object as it actually looks, not how you envision it is

8. Shading • Adding shading to a sketch can give it a more realistic appearance • Hatching lines and stippling are common forms of shading

9. Shading maybe used for aesthetic appeal…

10. Drawings and Sketches • The following skills are important for sketches and drawings: • Accuracy • Speed • Legibility • Neatness

11. Freehand Sketching • Freehand sketches are a helpful way to organize thoughts and record ideas • The degree of precision of a given sketch depends on its use • A freehand sketch should show attention to proportion, clarity, and correct line widths

12. Maintaining Proportions • Sketches are not usually made to a specific scale • The most important rule in freehand sketching is to keep the sketch in proportion • Grid paper can help you maintain proportions

13. One View Drawings • Frequently a single view supplemented by notes and dimensions can describe a simple object

14. Pictorial Sketching • A pictorial sketch represents a 3D object on a sheet of 2D paper by orienting the object so you can see its width, height, and depth in a single view

15. Pictorial Sketching • The three common methods used to sketch pictorials are: • Isometric sketching • Oblique sketching • Perspective sketching

16. Oblique Sketches • In oblique drawing, circles and angles parallel to the projection plane are true size and shape • Three things affect oblique sketches • Which surface is parallel to the projection plane • The angle and orientation for the receding lines depicting depth • The scale chosen for the receding lines

17. Oblique Sketches • Forty-five degrees is often chosen for the angle of receding lines • Thirty degrees is also a popular choice and can look more realistic • In cavalier projection, receding lines are drawn at full scale • In cabinet projection, the depth is represented at half scale

18. Oblique Sketches

19. Review…. Sketches… • Are quick, but legible… • Help refine and develop ideas…(Allows designer a greater sense of overall perception (how feature look and relate to one another)). • Are used to document important information to be developed later… • Can be used to show customers what the final product may look like… • Are less expensive to develop that permanent document during the early stages of manufacturing.