stonelaw high s1 graphic communication sketching … · 2014-08-13 · stonelaw high faculty of...

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Stonelaw High

S1 Graphic

Communication Sketching

Techniques

Stonelaw High Faculty of Home Economics & Technical

Education

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Contents

Freehand Sketching ......................................................................... 3

Three Dimensional Sketching ........................................................... 4

Isometric Sketching .......................................................................... 5

Thick & Thin Line Presentation ......................................................... 7

Oblique Sketching ............................................................................ 8

One point Perspective ...................................................................... 9

Texture ........................................................................................... 10

Two-Point Perspective Extension Materials .................................... 12


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Freehand Sketching The ability to generate ideas and put them on paper in the form of sketches is the basis of all good design. The designer must be able to sketch and draw, initially using sketches to communicate their ideas and then developing and refining these ideas before producing a final working drawing of the finished product. Freehand sketching allows you to develop your own ideas and shows other people your thoughts and ideas by sketching them on to paper. Freehand sketching must be done without the use of a ruler or set square as this can break up the flow of your ideas and prevent you from working quickly. These ideas can be presented in several different ways. Your teacher will show you how to sketch isometric views, oblique views, one and two-point perspective. Each of these pictorial views can be used to communicate your ideas in a different style and effect. Remember that the only way to improve your sketching is through practise. To improve your sketching you could try it in your spare time.


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Three Dimensional Sketching To show your ideas clearly you will need to sketch in three dimensions. This means you will show your sketches as a solid rather than a flat two-dimensional shape. A two-dimensional shape has only two measurements or dimensions: LENGTH and HEIGHT A three-dimensional form has three measurements or dimensions: LENGTH, HEIGHT AND BREADTH Crating To make freehand sketching easier crating is often used. A 3D crate is sketched which will contain the object. In other words everything that is sketched will be inside this crate. Try following the method below to produce a crate.

LENGTH

HEIGHT

HEIGHT

LENGTH

BREADTH


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Isometric Sketching An Isometric view is way of showing three dimensions or measurements on a drawing. The view is sketched using the method below. Lightly sketch a vertical line.

1. Lightly sketch two lines approximately at 30 to the horizontal. You should have what looks like an arrow pointing downwards.

2. Estimate the LENGTH, BREADTH and HEIGHT of the object and mark these off.

3. Add in vertical lines to make the object look like an open book standing up.

4. Complete the crate lightly. Take care to ensure that all vertical lines are

parallel. All lines at 30 (approximately) up to the right and left are also parallel to one another.


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Tonal Scale Shade and tone can be added to a design to give it a more realistic appearance. Assuming the further a surface is from light the darker the shade will be on the surface. It shows the effect of light falling on an object. The variations of light and dark are called tone. The easiest way to show tone is to use an HB pencil or coloured pencil. The side, which is closest to the light source, will have light tone and the surface the furthest distance away from the light will be the darkest. To add tone you must be able to add different levels of tone. This can be done using a tonal scale of five sides. 1 2 3 4 5 When adding tone do not lean heavily with the pencil as this can damage the paper. You should darken the tone by going over the surface each time until you reach the level of tone you require. Try this yourself using an HB pencil and coloured pencils. You could also try adding tone to a pictorial view using the scale as shown below.

Increase in Tone

No.3 on tonal scale

No.2 on tonal scale

No.1 on tonal scale


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Thick & Thin Line Presentation When you use crating, it is important to make the final object stand out from your light outlines on the paper. A darker outline distinguishes the shape from the construction lines.

Change the line thickness to give your object a more three-dimensional appearance. By following the guidelines below the presentation and effect of your object will be improved. 1. Add a thick line to an edge where only one surface is visible. 2. Leave a thin line where two visible surfaces meet. 3. For extra impact, draw in the thickest line around the outline of the object.


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Oblique Sketching Oblique Sketching is similar to isometric sketching. Sketching the flat shape of a rectangle or square starts oblique sketching. In the case of isometric views the lines are projected at 30 to the horizontal. In oblique views the lines from the shape are projected at 45 to the horizontal from the flat shape. The procedure for sketching an oblique object is as follows. 1. Lightly sketch a vertical and horizontal line as shown. 2. Lightly complete the front surface of the rectangle or square. . 3. Sketch the oblique (sloping) lines at approximately 45 to the horizontal as

shown. Try to keep these lines parallel to each other. 4. Lightly complete the crate shape. 5. You should keep your design within

your crate.

6. Use the Thick & Thin Line technique to improve the presentation of your design or object.


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One point Perspective For presentation purposes, you may wish to show your design in the environment where it will be used. A technique often employed to do this is called perspective drawing. It allows the designer to give an impression of depth as well as height and length just as you would see them in real life. The further an object is from your eyes the smaller it appears. The nearer it moves towards you, the larger it becomes. When an object is so far away that you can no longer see it, then it has disappeared usually at the horizon. Our eye level determines the horizon. This is known as the vanishing point. A perspective drawing creates this impression on paper. One point perspective drawings are often used by interior designers and in stage sets. To produce one point perspective follow these stages. 1. Take a sheet of A4 paper and divide it into four. 2. Mark the vanishing point (eye level) in the centre of the paper ( vp). 3. Sketch four Squares or rectangles one in each of the for divisions 4. Project a light line from each corner back to the vanishing point in the

centre. 5. Draw a horizontal and vertical line to join up the projection lines. 6. Use the Thick & Thin technique to emphasise the objects you have

drawn. Notice that where the object is in relation to the vanishing point will effect how the object is seen

Vp

Add horizontal and vertical lines.


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Texture All surfaces have surface texture. The texture of a material is the feel of a surface. Some surfaces are rough some are smooth and o on. Shown Below are some examples of how an object can be rendered to make it look more interesting. Try sketching some pictorial crates adding in texture to your object.


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Two-Point Perspective Extension Materials Two-point perspective is very similar to one point perspective. The position of the horizon will have an effect on how the object is viewed. The procedure is as follows 1. Sketch a light horizon line across the full length of the paper and mark on

the points VP1 and VP2. These points are known as the vanishing points and this line as the eye level.

2. Sketch a vertical line representing the nearest edge of the block (the

leading edge) and mark off the height. 3. Sketch light lines from the two marks you made on the vertical line to meet

the two vanishing points. 4. Estimate the length and distance from the front to the back of the block

and sketch vertical lines. 5. Sketch light lines from the top corners to the opposite vanishing pints as shown

VP2 VP1

VP1 VP2

VP1 VP2

VP2 VP1

VP1 VP2

Depending on where the front edge is sketched, in relation to the horizon line, gives different views of the block.


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Marker Rendering Exercise Use Markers to render the DAB Radio below. You should apply the techniques of shade and tone to show highlight.


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stonelaw high s1 graphic communication sketching … · 2014-08-13 · stonelaw high faculty of...

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