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📁 详细介绍Java 3D编程的一本电子书

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<TITLE>Defining vertices</TITLE>
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<CENTER>Building 3D shapes</CENTER>
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<CENTER><B><I>Defining vertices</I></B></CENTER>
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<DD><LI>A vertex normal defines surface information for <I>lighting</I>
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	<DD><LI>But the coordinate winding order defines the polygon's
		front and back, and thus the side that is drawn
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<DD><LI>If you want to light your geometry, you must specify vertex lighting normals
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	<DD><LI>Lighting normals must be <I>unit length</I>
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