Try It! Experimenting with Lighting Effects
You may be wondering which type of light to use: spot light,
directional light, or point light? Probably the best way to learn about
different light types is to experiment with them.
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To get started, in Cosmo Worlds, open the file /usr/share/Insight/library/SGI_bookshelves/Help/books/CosmoWorlds_UG/Models/lights.wrl.
This file contains three lights: a red point light, a blue spot light,
and a green directional light.
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Open the Light Editor and press the Show All button to
display the three light icons.
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Open the Viewpoint Editor and jump to viewpoint1, to show
the following view:

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In the Light Editor, select the individual lights and turn them on and
off to see their effects. Try moving them around, and use the direction
joystick to adjust the direction of the directional light and the spot
light.
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Try creating some new lights. Then adjust their direction, color, and
radius (if applicable).
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