Sophie

Sophie

distrib > Mandriva > 2010.0 > i586 > media > contrib-release > by-pkgid > bad97183153701b09df5fae1052b1c30 > files > 4104

crystalspace-doc-1.2.1-5mdv2010.0.i586.rpm

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html401/loose.dtd">
<html>
<!-- Created by texi2html 1.76 -->
<!--
Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author)
            Karl Berry  <karl@freefriends.org>
            Olaf Bachmann <obachman@mathematik.uni-kl.de>
            and many others.
Maintained by: Many creative people <dev@texi2html.cvshome.org>
Send bugs and suggestions to <users@texi2html.cvshome.org>

-->
<head>
<title>Crystal Space 1.2.1: C.2.18.3 Snow</title>

<meta name="description" content="Crystal Space 1.2.1: C.2.18.3 Snow">
<meta name="keywords" content="Crystal Space 1.2.1: C.2.18.3 Snow">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="texi2html 1.76">
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
pre.display {font-family: serif}
pre.format {font-family: serif}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
pre.smalldisplay {font-family: serif; font-size: smaller}
pre.smallexample {font-size: smaller}
pre.smallformat {font-family: serif; font-size: smaller}
pre.smalllisp {font-size: smaller}
span.sansserif {font-family:sans-serif; font-weight:normal;}
ul.toc {list-style: none}
-->
</style>


</head>

<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">

<a name="Api1_005f0-PartConv-Snow"></a>
<a name="0"></a>
<table cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="Api1_005f0-PartConv-Rain.html#0" title="Previous section in reading order"> &lt; </a>]</td>
<td valign="middle" align="left">[<a href="Api1_005f0-PartConv-Fire.html#0" title="Next section in reading order"> &gt; </a>]</td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="Release-Notes.html#0" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
<td valign="middle" align="left">[<a href="Api1_005f0-Particle-system-changes.html#0" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="Licenses.html#0" title="Next chapter"> &gt;&gt; </a>]</td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="index.html#SEC_Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="cs_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="cs_Index.html#0" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="cs_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
</tr></table>
<hr size="1">
<h4 class="subsubsection"> C.2.18.3 Snow </h4>

<p>To convert the old snow particle system to new particles you
can use a box emitter which is oriented at the top where the snow drops
should appear and which is very thin. You can use a force effector
with random acceleration on the <small>XZ</small> plane to get the effect that
snowflakes drift. Here you see an example of a snow particle system in the
world file:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">  &lt;meshfact name=&quot;snowFact&quot;&gt;
    &lt;plugin&gt;crystalspace.mesh.loader.factory.particles&lt;/plugin&gt;
    &lt;params&gt;
      &lt;particlesize x=&quot;0.17&quot; y=&quot;0.17&quot; /&gt;
      &lt;minbb&gt;
        &lt;min x=&quot;-5&quot; y=&quot;-0.3&quot; z=&quot;-5&quot; /&gt;
        &lt;max x=&quot;10&quot; y=&quot;6&quot; z=&quot;10&quot; /&gt;
      &lt;/minbb&gt;
      &lt;sortmode&gt;none&lt;/sortmode&gt;
      &lt;emitter type=&quot;box&quot;&gt;
        &lt;emissionrate&gt;250&lt;/emissionrate&gt;
        &lt;mass min=&quot;5&quot; max=&quot;7.5&quot; /&gt;
        &lt;box&gt;
          &lt;min x=&quot;-5&quot; y=&quot;6&quot; z=&quot;-5&quot; /&gt;
          &lt;max x=&quot;10&quot; y=&quot;6&quot; z=&quot;10&quot; /&gt;
        &lt;/box&gt;
        &lt;uniformvelocity /&gt;
        &lt;initialvelocity x=&quot;0&quot; y=&quot;-1.42&quot; z=&quot;0&quot; /&gt;
        &lt;initialttl min=&quot;5&quot; max=&quot;5&quot; /&gt;
        &lt;placement&gt;volume&lt;/placement&gt;
      &lt;/emitter&gt;
      &lt;effector type=&quot;lincolor&quot;&gt;
        &lt;color red=&quot;0&quot; green=&quot;0&quot; blue=&quot;1&quot; time=&quot;5&quot; /&gt;
      &lt;/effector&gt;
      &lt;effector type=&quot;force&quot;&gt;
	&lt;randomacceleration x=&quot;2.5&quot; y=&quot;0&quot; z=&quot;2.5&quot; /&gt;
      &lt;/effector&gt;
    &lt;/params&gt;
  &lt;/meshfact&gt;
  ...
  &lt;meshobj name=&quot;snowfall&quot;&gt;
    &lt;priority&gt;alpha&lt;/priority&gt;
    &lt;plugin&gt;crystalspace.mesh.loader.particles&lt;/plugin&gt;
    &lt;ztest /&gt;
    &lt;params&gt;
      &lt;factory&gt;snowFact&lt;/factory&gt;
      &lt;mixmode&gt;
        &lt;add /&gt;
      &lt;/mixmode&gt;
      &lt;material&gt;snow&lt;/material&gt;
    &lt;/params&gt;
    &lt;move&gt;
      &lt;v x=&quot;10&quot; y=&quot;0&quot; z=&quot;10&quot; /&gt;
    &lt;/move&gt;
  &lt;/meshobj&gt;
</pre></td></tr></table>
<p>Here is how this could work in code:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">  csRef&lt;iMeshFactoryWrapper&gt; mfw = engine-&gt;CreateMeshFactory (
      &quot;crystalspace.mesh.object.particles&quot;, &quot;snow&quot;);
  if (!mfw) return;

  csRef&lt;iMeshWrapper&gt; exp = engine-&gt;CreateMeshWrapper (mfw, &quot;custom snow&quot;,
	sector, csVector3 (0, 0, 0));

  exp-&gt;SetZBufMode(CS_ZBUF_TEST);
  exp-&gt;GetMeshObject()-&gt;SetMixMode (CS_FX_ADD);
  exp-&gt;GetMeshObject()-&gt;SetMaterialWrapper (mat);

  csRef&lt;iParticleBuiltinEmitterFactory&gt; emit_factory = 
      csLoadPluginCheck&lt;iParticleBuiltinEmitterFactory&gt; (
        Sys-&gt;object_reg, &quot;crystalspace.mesh.object.particles.emitter&quot;, false);
  csRef&lt;iParticleBuiltinEffectorFactory&gt; eff_factory = 
      csLoadPluginCheck&lt;iParticleBuiltinEffectorFactory&gt; (
        Sys-&gt;object_reg, &quot;crystalspace.mesh.object.particles.effector&quot;, false);

  csRef&lt;iParticleBuiltinEmitterBox&gt; boxemit = emit_factory-&gt;CreateBox ();
  boxemit-&gt;SetBox (bbox);
  boxemit-&gt;SetParticlePlacement (CS_PARTICLE_BUILTIN_VOLUME);
  boxemit-&gt;SetEmissionRate (num / 5f);
  boxemit-&gt;SetInitialMass (5.0f, 7.5f);
  boxemit-&gt;SetUniformVelocity (true);
  boxemit-&gt;SetInitialTTL (5f, 5f);
  boxemit-&gt;SetInitialVelocity (csVector3 (0, -1.42f, 0), csVector3 (0));

  csRef&lt;iParticleBuiltinEffectorLinColor&gt; lincol = eff_factory-&gt;
    CreateLinColor ();
  lincol-&gt;AddColor (csColor4 (.25,.25,.25,1), 2.5f);

  csRef&lt;iParticleBuiltinEffectorForce&gt; force = eff_factory-&gt;
    CreateForce ();
  force-&gt;SetRandomAcceleration (csVector3 (1.5f, 0.0f, 1.5f));

  csRef&lt;iParticleSystem&gt; partstate =
  	scfQueryInterface&lt;iParticleSystem&gt; (exp-&gt;GetMeshObject ());
  partstate-&gt;SetMinBoundingBox (bbox);
  partstate-&gt;SetParticleSize (csVector2 (0.07f, 0.07f));
  partstate-&gt;AddEmitter (boxemit);
  partstate-&gt;AddEffector (lincol);
  partstate-&gt;AddEffector (force);
</pre></td></tr></table>
<hr size="1">
<p>
 <font size="-1">
  This document was generated using <a href="http://texi2html.cvshome.org/"><em>texi2html 1.76</em></a>.
 </font>
 <br>

</p>
</body>
</html>

Perl :: Catalyst :: PostgreSQL :: RPM Valid HTML 4.01 Transitional