//-----------------------------------------------------------------------------
// Name: Lights Direct3D Tutorial
//
// Copyright (c) 2000-2001 Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------
Description
===========
The Lights tutorial shows how to use dynamic lighting in Direct3D.
Path
====
Source: DXSDK\Samples\Multimedia\D3D\Tutorials\Tut04_Lights
Programming Notes
=================
Dynamic lighting makes 3D objects look more realistic. Lights come in a few
flavors, notably point lights and directional lights. Geometry gets lit by
every light in the scene, so adding lights increases rendering time. Point
lights have a poistion and are computationally more expensive than directional
lights, which only have a direction (as if the light source is infinitely far
away). Internal Direct3D lighting calculations require surface normals, so note
that normals are added to the vertices. Also, material properties can be set,
which describe how the surface interacts with the light (i.e. it's color).
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