📄 spring.htm

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<p><font face="Arial, Helvetica, sans-serif" size="4">Springs and Dashpots</font></p>
<blockquote> 
  <blockquote> 
    <p><font face="Arial, Helvetica, sans-serif" size="2">Now that our scene is 
      moving in a physical accurate manner we can begin to control and interact 
      with it. The Havok Xtra provides specific functions to effect individual 
      rigid bodies. Rigid bodies can have their position and rotation altered 
      either directly (via a variety of &quot;&#133;MoveTo&quot; functions) or 
      indirectly (via the simulation by applying forces, impulses or torques). 
      </font></p>
    <p><font face="Arial, Helvetica, sans-serif" size="2">Beyond these standard 
      functions the Havok Xtra also provides integrated and simple constraints 
      in the form of dashpots and springs. Springs have a rest length and elasticity 
      and they function, as would the real world equivalent. Dashpots can be thought 
      of restrictors. Linear dashpots restrict the position of a rigid body. The 
      position may be restricted to a specific point in the world space or to 
      a point offset relative to another rigid body. This latter restriction, 
      for example, would allow a chain of rigid bodies to be created. Angular 
      dashpots attempt to restrict a rigid body's rotation. This means that a 
      box, for example, could have its orientation restricted so that it will 
      always try to be balancing a corner. </font></p>
    <p><font face="Arial, Helvetica, sans-serif" size="2">We will now alter our 
      current scene to make it more interesting than just having a box fall on 
      top of a ball. A linear dashpot can be added to restrict the position of 
      the box model while still allowing it to spin. Furthermore a strong spring 
      can be added, attaching the ball model to the position-locked box. This 
      spring can be set up to continually cause the ball to hit the box introducing 
      an interesting chaotic interaction.</font></p>
    <blockquote> 
      <p><font face="Courier New, Courier, mono" size="2">on createDashpot me</font></p>
      <blockquote> 
        <p><font face="Courier New, Courier, mono" size="2">worldPoint = w.model(&quot;TheBox&quot;).transform.position<br>
          dashpot = hk.makeLinearDashpot( "DashpotName", "TheBox", worldPoint )<br>
          dashpot.strength = 1000<br>
          dashpot.damping = 100</font></p>
      </blockquote>
      <p><font face="Courier New, Courier, mono" size="2">end</font></p>
      <p><font face="Courier New, Courier, mono" size="2">on createSpring me</font></p>
      <blockquote> 
        <p><font face="Courier New, Courier, mono" size="2">spring = hk.makeSpring( "SpringName", "TheBox", "TheBall" )<br>
          spring.restLength = 3.5<br>
          spring.elasticity = 10000<br>
          spring.damping = 1</font></p>
      </blockquote>
      <p><font face="Courier New, Courier, mono" size="2">end</font></p>
    </blockquote>
    <p><font face="Arial, Helvetica, sans-serif" size="2">The Lingo script for 
      the creation of the linear dashpot and spring is shown above. Add this to 
      section of script to the Behavior. Also call these two new functions within 
      <b>beginSprite</b> after the physical objects have been created.</font></p>
    <p align="center"><img src="stagecopy.jpg" width="342" height="281" align="middle"></p>
    <p><font face="Arial, Helvetica, sans-serif" size="2">Running the movie should 
      give a view similar to the stage shown above.</font></p>
    <p>&nbsp;</p>
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