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Basic Rendering Techniques Product Design Sketching.

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Basic Rendering Techniques Product Design Sketching
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Page 1: Basic Rendering Techniques Product Design Sketching.

Basic Rendering Techniques

Product Design Sketching

Page 2: Basic Rendering Techniques Product Design Sketching.

Basic Attributes of Colour

A colour can be denoted by its HSB value, i.e. the 3 attributes:

Hue (its location in a colour spectrum) Saturation (the intensity of colour pigment) Brightness (the intensity of light)

Page 3: Basic Rendering Techniques Product Design Sketching.

Saturation vs. Brightness

saturation

brig

htne

ss

Page 4: Basic Rendering Techniques Product Design Sketching.

HSB Values

You may use the colour picker of Adobe PhotoShop to identify the HSB values of your colour pencil

Adjust hue and saturation

Adjust brightness

Page 5: Basic Rendering Techniques Product Design Sketching.

Creating Different Tones Using Dry Media

Three ways to create tones:

1. By intensity of pigment / strokes

2. By using different degrees of colour saturation

3. By using colours of different colour temperatures (hues)

Page 6: Basic Rendering Techniques Product Design Sketching.

Varying Intensities

Greater stroke pressure represents shade

Medium pressure represents mid-tone

Lowest pressure represent highlight

Best for light colours

Page 7: Basic Rendering Techniques Product Design Sketching.

Varying Saturations

Reduce the saturation either by choosing a colour of a

lower saturation value; or

Using grey / black colour as a blending agent

Best for natural colours

Page 8: Basic Rendering Techniques Product Design Sketching.

Varying Colour Temperatures

Use a warmer hue (e.g. orange) than the midtone colour for highlights

Use a cooler hue (e.g. blue or purple) for shades

Best for vivid colours

Page 9: Basic Rendering Techniques Product Design Sketching.

Colour of an Object

The color of an object being seen is determined by: Local colour (of the object’s surface material) Ambient colour (of the light source) Reflected colour (from another object’s nearby)

Page 10: Basic Rendering Techniques Product Design Sketching.

Light and Shades

Identify different light zones and then create tonal values:

1. Highlight 2. Middle tone3. Shade 4. Backlight (for curved surface)

Page 11: Basic Rendering Techniques Product Design Sketching.

Shades and Shadows

Shade is the surface or area of a surface not facing the light source

Shadow is the area of a surface blocked by other objects or by other parts of the same object

Page 12: Basic Rendering Techniques Product Design Sketching.

Casting Shadows

1. Use projection lines to simulate the light rays

2. Matching key points along the object’s contours on the surface on which the object is placed

3. Define the edge of the shadows 4. Render with a cooler colour

Page 13: Basic Rendering Techniques Product Design Sketching.

Shading the Cube

Product Design Sketching Activity


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