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<p><font face="Arial, Helvetica, sans-serif" size="4">Introduction</font></p>
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<p><font face="Arial, Helvetica, sans-serif" size="2">The Havok Xtra is a
fully integrated rigid body physics simulation engine for Macromedia Director.
The Havok Xtra provides complete access to physical properties and events
giving you complete control over their simulated world. It enables you to
assign properties such as mass and elasticity to physical objects, apply
forces, impulses or torques and set velocities and momentum. You can also
register interest in specific rigid body collisions or even disable them
completely. Support is provided for importing Havok HKE (Havok Exporter)
files, which allow full physics scenes to be constructed in a 3D modeler
(like 3ds max) without requiring additional Lingo scripts. </font></p>
<p><font face="Arial, Helvetica, sans-serif" size="2"> The Havok Xtra comes
with a library of behaviors to simplify the creation of physics scenes and
a series of demos highlighting the many powerful features of the engine.</font></p>
<p><font face="Arial, Helvetica, sans-serif" size="2"> A Havok cast member
contains all information required to turn a static 3D world into a dynamic
physical simulated one. Each Havok cast member is linked to a Director 3D
cast member. No sprites need to be created directly from a Havok cast member
as the dynamic world is seen through a 3D sprite.</font></p>
<p><font face="Arial, Helvetica, sans-serif" size="2">There are a number of
stages in setting up and updating a Havok controlled 3D world:</font></p>
<ul>
<li><font face="Arial, Helvetica, sans-serif" size="2"> Initialization including
creation of rigid bodies </font></li>
<li><font face="Arial, Helvetica, sans-serif" size="2"> Applying external
inputs to the simulation like forces, torques etc.</font></li>
<li><font face="Arial, Helvetica, sans-serif" size="2"> Stepping - perform
simulation and advance the world to a new time. </font></li>
<li><font face="Arial, Helvetica, sans-serif" size="2"> Shutdown. </font></li>
</ul>
<p><font face="Arial, Helvetica, sans-serif" size="2">This quick start guide
covers the core functionality of the Havok Xtra. It assumes a basic understanding
of Macromedia Director and its Lingo scripting language. We will create
a simple scene with physical properties, introducing the main building blocks
along the way. For more information on working with the Havok Xtra you should
consult the Havok Xtra Lingo Reference Guide and Havok Xtra Behavior Reference
Guide and many other documents and examples available on the<a href="http://www.havok.com/xtra">
Havok Xtra developer site</a>. </font></p>
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