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It is clear from the previous example that the lighting must be adjusted to accommodate materials.<br />
With the second image from the previous test if we created another material and inserted into the<br />
scene, it would not render how we created it.<br />
Here’s another example. Lets take the shirt that you’re wearing right now. What color is it? If you<br />
walked into a closet with no light, what would the color of your shirt be? The answer is that the<br />
color of your shirt would be the same, BUT it would appear different based on the lighting<br />
environment. This is why you should adjust your lighting to achieve the desired affect, as opposed<br />
to changing the materials.<br />
With an incorrect lighting environment, such as the second part of the example on the previous page, it will<br />
be very hard to predict how your scene will react. When adding an new material, it will not look how it did<br />
when you created it, thus making it harder to achieve the original intended appearance <strong>for</strong> the material.<br />
Incorrect lighting also has an adverse affect on other aspects of your rendering and may affect shadows,<br />
reflections, and even make your rendering take longer than it should. Now you see why having a proper<br />
lighting solution is very important<br />
Interior or Exterior?<br />
When facing the task of illumination, separate it into interior illumination and exterior illumination. Here<br />
exterior means open space. For example, place an object on the ground without any wall surrounds it to block<br />
the light. It's easier to adjust illumination <strong>for</strong> open space. Interior means light source is blocked by wall or<br />
other similar objects in the scene, an enclosed space in which the environment light will not have the direct<br />
effect to the object. Or maybe some openings on the wall or windows allow part of environment light comes<br />
through them. Interior lighting is generally more complex than exterior lighting.<br />
Image on the left shows open space illumination and image on the left shows the semi-open space<br />
illumination.<br />
Image on the left shows the same semi-open space but add one more opening to the wall. The brightness<br />
increased due to second opening added to the wall. Image on the right shows different locations <strong>for</strong> openings<br />
also affect the brightness of the scene.<br />
V-<strong>Ray</strong> <strong>for</strong> <strong>Rhino</strong> 59
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