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All
scenes must contain at least one light source, otherwise none of the objects
will be visible. (Strictly speaking, lights are just part of the model.
However, they deserve special consideration because you need them to be able
to see anything.)
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The
AmbientLight type illuminates all objects uniformly. It does not vary
illumination according to position or angle. This provides an easy way of
making sure everything is visible, but tends to provide a very ‘flat’ look.
There is nothing in nature corresponding directly to ambient light – all
light comes from some light source either directly or indirectly.
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DirectionalLight
simulates a strong light source a long distance away, such as sunlight. Parts
of an object facing the light will be more brightly illuminated than those
facing away from the light. This light source takes into account the
orientation of objects, but not their location.
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PointLight
simulates a nearby light source, such as a light bulb in a room. SpotLight is
similar, except it does not radiate in all directions – it projects a cone of
light.
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One of
the nice things about the fact that lights are essentially a part of the
model is that you can move them around – you can animate light sources just
like you can animate anything else.
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