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<!--  This file copyright Persistence of Vision Raytracer Pty. Ltd. 2003-2004  -->
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    <strong class="NavBar">POV-Ray 3.6 for UNIX documentation</strong><br> <strong>3.5.4 
   Halo</strong> 
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<h3><a name="s03_05_04">3.5.4 </a>Halo</h3>
<a name="s03_05_04_i1"><a name="halo"></a><a name="s03_05_04_i2"><a name="halo, keyword"></a><a name="s03_05_04_i3">
<p>
  Earlier versions of POV-Ray used a feature called <code>halo</code> to simulate fine particles such as smoke, 
 steam, fog, or flames. The <code> halo</code> statement was part of the <code>texture</code> statement. This feature 
 has been discontinued and replaced by the <code>interior</code> and <code>media</code> statements which are object 
 modifiers outside the <code> texture</code> statement. 
</p>

<p>
  See &quot;<a href="s_128.html#s03_06_01_01">Why are Interior and Media Necessary?</a>&quot; for a detailed 
 explanation on the reasons for the change. See &quot;<a href="#l144">Media</a>&quot; for details on <code>media</code>. 
 
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 <a name="l144">
<small><strong>More about &quot;Media&quot;</strong></small>
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  <li><small>
   <a href="s_129.html#s03_06_02">3.6.2 Media</a> in 3.6 Interior &amp; Media &amp; Photons
  </small>

  <li><small>
   <a href="s_163.html#s03_08_11">3.8.11 Media</a> in 3.8 Quick Reference
  </small>

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