# Commits

committed 9cd45ec

Forgot to XInclude Tut09 in the main article.

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• Parent commits a709e3c

# File Documents/Illumination/Tutorial 09.xml

`         point, light position, and surface normal must all be in the same space for this equation to`
`         make sense.</para>`
`     <section>`
`+        <?dbhtml filename="Tut09 Vertex Point Lighting.html" ?>`
`         <title>Vertex Point Lighting</title>`
`         <para>Thus far, we have computed the lighting equation at each vertex and interpolated the`
`             results across the surface of the triangle. We will continue to do so for point lights.`
`                 <function>normalize</function> call is just to convert it into a unit vector.</para>`
`     </section>`
`     <section>`
`+        <?dbhtml filename="Tut09 Interpolation.html" ?>`
`         <title>Interpolation</title>`
`         <para>As you can see, doing point lighting is quite simple. Unfortunately, the visual`
`             results are not.</para>`
`             correct.</para>`
`     </section>`
`     <section>`
`+        <?dbhtml filename="Tut09 Fragment Lighting.html" ?>`
`         <title>Fragment Lighting</title>`
`         <para>So, in order to deal with interpolation artifacts, we need to interpolate the actual`
`             light direction and normal, instead of just the results of the lighting equation. This`
`         </section>`
`     </section>`
`     <section>`
`+        <?dbhtml filename="Tut09 Distant Points of Light.html" ?>`
`         <title>Distant Points of Light</title>`
`         <para>There is another issue with our current example. Use the <keycap>i</keycap> key to`
`             raise the light up really high. Notice how bright all of the upwardly-facing surfaces`

# File Documents/Tutorials.xml

`                 light/surface models and explain how to implement them.</para>`
`         </partintro>`
`         <xi:include href="Illumination/tutorial 08.xml"/>`
`+        <xi:include href="Illumination/tutorial 09.xml"/>`
`     </part>`
`     <part>`
`         <?dbhtml filename="Texturing.html" dir="Texturing" ?>`