Source

gltut / Documents / Illumination.xml

Full commit
<?xml version="1.0" encoding="UTF-8"?>
<?oxygen RNGSchema="http://docbook.org/xml/5.0/rng/docbookxi.rng" type="xml"?>
<?oxygen SCHSchema="http://docbook.org/xml/5.0/rng/docbookxi.rng"?>
<part xmlns="http://docbook.org/ns/docbook" xmlns:xi="http://www.w3.org/2001/XInclude"
    xmlns:xlink="http://www.w3.org/1999/xlink" version="5.0">
    <?dbhtml filename="Illumination.html" dir="Illumination" ?>
    <info>
        <title>Illumination</title>
    </info>
    <partintro>
        <para>One of the most important aspects of rendering is lighting. Thus far, all of our
            objects have had a color that is entirely part of the mesh data, pulled from a
            uniform variable, or computed in an arbitrary way. This makes all of our objects
            look very flat and unrealistic.</para>
        <para>Properly modeling the interaction between light and a surface is vital in creating
            a convincing world. Lighting defines how we see and understand shapes to a large
            degree. This is the reason why the objects we have used thus far look fairly flat. A
            curved surface appears curved to us because of how the light plays over the surface.
            The same goes for a flat surface. Without this visual hinting, surfaces appear flat
            even when they are modeled with many triangles and yield a seemingly-curved
            polygonal mesh.</para>
        <para>A proper lighting model makes objects appear real. A poor or inconsistent lighting
            model shows the virtual world to be the forgery that it is. The tutorials in this
            section will introduce some light/surface models and explain how to implement
            them.</para>
    </partintro>
    <xi:include href="Illumination/tutorial 09.xml"/>
    <xi:include href="Illumination/tutorial 10.xml"/>
    <xi:include href="Illumination/tutorial 11.xml"/>
    <xi:include href="Illumination/tutorial 12.xml"/>
    <xi:include href="Illumination/tutorial 13.xml"/>
</part>