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<p><font face="Arial, Helvetica, sans-serif" size="4">An Extended Example</font></p>
<blockquote>
<blockquote>
<p><font face="Arial, Helvetica, sans-serif" size="2">We will start with a
new movie (<b>File > New > Movie</b> or <b>Ctrl+n</b>). Every movie
needs a cast. Our movie will consist of a 3D world and its physical representation.</font></p>
<ul>
<li><font face="Arial, Helvetica, sans-serif" size="2">Add a blank <b>Havok
Physics Scene </b>member by using the <b>Insert </b>menu: <b>Insert >
Media Element > Havok Physics Scene</b>.</font></li>
<li><font face="Arial, Helvetica, sans-serif" size="2"> Add a blank Shockwave
3D member using <b>Insert > Media Element > Shockwave 3D</b>.</font></li>
<li><font face="Arial, Helvetica, sans-serif" size="2"> Drag the Shockwave
3D member onto the stage to create a sprite.</font></li>
</ul>
<p><font face="Arial, Helvetica, sans-serif" size="2">Currently our 3D world
is empty. We will now populate it with a few simple objects. This can be
done via a simple Lingo script.</font></p>
<ul>
<li><font face="Arial, Helvetica, sans-serif" size="2">Add a new behavior
by selecting <b>Window > Inspectors > Behavior </b>on the main menu and
then clicking the <b>+ </b>icon followed by selecting <b>New Behavior</b>.
</font></li>
<li><font face="Arial, Helvetica, sans-serif" size="2"> Drag the new behavior
onto the 3D sprite.</font></li>
</ul>
<p><font face="Arial, Helvetica, sans-serif" size="2">Add the following text
to the newly create Lingo behavior. This script creates a simple scene made
up from two boxes and a sphere.</font></p>
<blockquote>
<p><font face="Courier New, Courier, mono" size="2">property w, hk</font></p>
<p><font face="Courier New, Courier, mono" size="2">on beginSprite me</font></p>
<blockquote>
<p><font face="Courier New, Courier, mono" size="2">hk = member( 1 )<br>
w = member( 2 )<br>
<br>
<b>hk.initialize</b>( w, 0.1, 1 )<br>
<br>
createVisibleObjects()<br>
createPhysicalObjects()</font></p>
</blockquote>
<p><font face="Courier New, Courier, mono" size="2">end </font></p>
</blockquote>
</blockquote>
</blockquote>
<blockquote>
<blockquote>
<blockquote>
<p><font face="Courier New, Courier, mono" size="2">on createVisibleObjects
me</font></p>
<blockquote>
<p><font face="Courier New, Courier, mono" size="2">-- create box<br>
mr = w.newModelResource("TheBoxRes", #box)<br>
mr.width = 2<br>
mr.height = 2<br>
mr.length = 2<br>
m = w.newModel("TheBox", mr)<br>
m.transform.rotation = vector(0,5,0)<br>
m.transform.position = vector(0,0,10)<br>
<br>
-- create ball<br>
mr = w.newModelResource("TheBallRes", #sphere)<br>
mr.radius = 1<br>
m = w.newModel("TheBall", mr)<br>
m.transform.position = vector(0,0,5)<br>
<br>
-- create ground<br>
mr = w.newModelResource("TheGroundRes", #box)<br>
mr.width = 15<br>
mr.height = 10<br>
mr.length = 1<br>
m = w.newModel("TheGround", mr) <br>
<br>
-- point camera<br>
c = w.camera[1]<br>
c.transform.position = vector(0,20,20)<br>
c.pointat(m.transform.position + vector(0,0,5), vector(0,0,1))<br>
c.hither = 1<br>
c.yon = 1000<br>
<br>
w.directionalPreset = #bottomLeft</font></p>
</blockquote>
<p><font face="Courier New, Courier, mono" size="2">end</font></p>
</blockquote>
</blockquote>
</blockquote>
<blockquote>
<blockquote>
<blockquote>
<p><font face="Courier New, Courier, mono" size="2">on createPhysicalObjects
me</font></p>
<blockquote>
<p><font face="Courier New, Courier, mono" size="2"> -- box<br>
m = w.model("TheBox")<br>
m.addModifier(#meshdeform)<br>
<b>rb = hk.makeMovableRigidBody(m.name, 50)</b><br>
<br>
-- ball<br>
m = w.model("TheBall")<br>
m.addModifier(#meshdeform)<br>
<b>rb = hk.makeMovableRigidBody(m.name, 100)<br>
rb.restitution = 1<br>
rb.friction = 0</b><br>
<br>
-- ground<br>
m = w.model("TheGround") <br>
m.addModifier(#meshdeform)<br>
<b>rb = hk.makeFixedRigidBody(m.name)</b></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 lines specific to
the Havok Xtra are highlighted in <b>bold</b>. Full details of these functions
and properties can be found in the Havok Xtra Lingo Reference. We will only
briefly examine them here.</font></p>
<p><font face="Arial, Helvetica, sans-serif" size="2">Each physically simulated
scene must be linked to a visible 3D equivalent. To make this link the hk.initialize()
function is passed a reference to the Shockwave 3D cast member representing
the visible world. </font></p>
<p><font face="Arial, Helvetica, sans-serif" size="2"><b>Note:</b> <b>hk.initialize()
</b>must be called first before any other actions relating to our physical
simulation can be preformed.</font></p>
<p><font face="Arial, Helvetica, sans-serif" size="2">After initialization
the script creates a number of 3D models that become visible in the scene.
Once created it is possible to take these models and give them physical
properties - make them into rigid bodies. As can be seen in the <b>createPhysicalObjects
</b>function we are making "TheBox" and "TheBall" objects
into movable rigid bodies. Movable rigid bodies have a mass and are free
to move, bounce and spin. "TheGround" is created as a fixed rigid
body that will never move and will never be effected by over objects hitting
it. </font></p>
<p><font face="Arial, Helvetica, sans-serif" size="2">At this point, we have
created a simple physical 3D world. However, if the movie is played the
view though our stage sprite still shows a static scene. This is because
the physical simulation must be advanced upon each frame. The Havok Xtra
refers to this as stepping and provides a Lingo function to perform this
action.</font></p>
</blockquote>
</blockquote>
<blockquote>
<blockquote>
<blockquote>
<p><font face="Courier New, Courier, mono" size="2">on exitFrame me</font></p>
<blockquote>
<p><font face="Courier New, Courier, mono" size="2"> <b>hk.step()</b></font></p>
</blockquote>
<p><font face="Courier New, Courier, mono" size="2">end</font></p>
</blockquote>
</blockquote>
</blockquote>
<blockquote>
<blockquote>
<blockquote>
<p><font face="Courier New, Courier, mono" size="2">on endSprite me</font></p>
<blockquote>
<p><font face="Courier New, Courier, mono" size="2"> <b>hk.shutdown()</b><br>
w.resetWorld()</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">Add the above lines
to your behavior script. The call to the stepping function (hk.step) will
be preformed at the end of each frame before the movie advances to the next
one. This causes the simulation to calculate the new positions and orientations
of each model. This means that they are ready to be drawn within the stage
sprite at the start of the new frame. Furthermore, when the movie stops
and before we reset our 3D world to its original blank slate, the physics
simulation needs to be shutdown as well.</font></p>
</blockquote>
</blockquote>
<p> </p>
<p> </p>
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