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starburst_mat.html
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<html>
<!-- Creation date: 26/03/02 -->
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>sunburst.html</title>
<meta name="Description" content="">
<meta name="Keywords" content="">
<meta name="Author" content="Julian MacDonald">
<meta name="Generator" content="AceHTML 4 Pro">
</head>
<body BGCOLOR="#f8e89e">
<font face="tahoma" size="2">
<table><tr>
<td><img src="textures/mat_orange_fur_ex.jpg"></td>
<td><font face="tahoma" size="2">
This material is based on the <b>Grid</b> pattern to which a <b>spherical</b> transform is partly applied.
Note than the R output from the spherical output is not fed into the grid; rather a 0 value is the input
which stretches the grid pattern radially outwards.<br>
<br>
The resulting grid pattern is then evaluated with the <b>greater than</b> function to pick out points within
a radius of 0.03, i.e thin 'spokes' (the Grid spacing is set at 0.1). This is fed into the density function
so that the 'spokes' have a high density and everywhere else is zero.<br>
<br>
<br>
<b>Transparency</b> is set to a very low (but non-zero) value to produce a virtually opaque material.<br>
<br>
<br>
Finally, the R output of the <b>Spherical</b> transform is fed into a custom colour map to produce
a pattern whose colour varies with distance from the centre.<br>
<br>
<br>
The <b>Integration Step Size</b> was reduced to 0.01 to allow more accurate rendering of the fine (0.03) spokes.
<br>
</font></td>
</tr></table><br>
<br>
<br>
<a href="materials.html#ex_materials"><b><font size="4">Back to Materials</font></b></a><br>
</font>
</body>
</html>