Transcript Basic Rendering Techniques

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)
brightness
Saturation vs. Brightness
saturation
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
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)
Varying Intensities
 Greater stroke
pressure represents
shade
 Medium pressure
represents mid-tone
 Lowest pressure
represent highlight
 Best for light colours
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
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
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)
Light and Shades

1.
2.
3.
4.
Identify different light zones and
then create tonal values:
Highlight
Middle tone
Shade
Backlight (for curved surface)
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
Casting Shadows
1.
2.
3.
4.
Use projection lines to simulate
the light rays
Matching key points along the
object’s contours on the surface
on which the object is placed
Define the edge of the shadows
Render with a cooler colour
Shading the Cube
Product Design Sketching Activity