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.drawing

S KETCHES CAN HIGHLIGHT IMPORTANT INFORMATION

W E CAN USE SKETCHES TO TRANSFER INFORMATION TO A WORKSPACE …

U NDERSTANDING S KETCHING T ECHNIQUES 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

U NDERSTANDING S KETCHING T ECHNIQUES Essential shapes can be blocked in using construction lines

U NDERSTANDING S KETCHING T ECHNIQUES Contours show the contrast between positive and negative space

V IEWPOINT 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

S HADING Adding shading to a sketch can give it a more realistic appearance Hatching lines and stippling are common forms of shading

S HADING MAYBE USED FOR AESTHETIC APPEAL …

D RAWINGS AND S KETCHES The following skills are important for sketches and drawings: Accuracy Speed Legibility Neatness

F REEHAND S KETCHING 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

M AINTAINING P ROPORTIONS 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

O NE V IEW D RAWINGS Frequently a single view supplemented by notes and dimensions can describe a simple object

P ICTORIAL S KETCHING 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

P ICTORIAL S KETCHING The three common methods used to sketch pictorials are: Isometric sketching Oblique sketching Perspective sketching

O BLIQUE S KETCHES 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

O BLIQUE S KETCHES 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

O BLIQUE S KETCHES

R EVIEW …. 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.