mt0287.htm

来自「详细介绍Java 3D编程的一本电子书」· HTM 代码 · 共 95 行

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<TITLE>Understanding constraints and policies</TITLE>
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<CENTER>Introducing the view model</CENTER>
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<CENTER><B><I>Understanding constraints and policies</I></B></CENTER>
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<DD><LI>A chain of relationships control this mapping between worlds
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	<DD><LI>Eye locations relative to the user's head
	<DD><LI>Head location relative to a head tracker
	<DD><LI>Head tracker relative to the tracker base
	<DD><LI>Tracker base relative to an image plate (display)
	<DD><LI><I>. . . and so on, with variations</I>
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<DD><LI>A <I>constraint system</I> defines these relationships
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	<DD><LI>For a given environment and usage, some relationships
		are constants, while others vary
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<DD><LI>Java 3D <I>policies</I> select among standard constraint systems
	and control how they adapt to changes
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