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Object3D (Mobile 3D Graphics API (M3G))
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<EM><B>Nov 19, 2003</B></EM></EM>
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javax.microedition.m3g</FONT>
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Class Object3D</H2>
<PRE>
java.lang.Object
|
+--<B>javax.microedition.m3g.Object3D</B>
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<DL>
<DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../javax/microedition/m3g/AnimationController.html">AnimationController</A>, <A HREF="../../../javax/microedition/m3g/AnimationTrack.html">AnimationTrack</A>, <A HREF="../../../javax/microedition/m3g/Appearance.html">Appearance</A>, <A HREF="../../../javax/microedition/m3g/Background.html">Background</A>, <A HREF="../../../javax/microedition/m3g/CompositingMode.html">CompositingMode</A>, <A HREF="../../../javax/microedition/m3g/Fog.html">Fog</A>, <A HREF="../../../javax/microedition/m3g/Image2D.html">Image2D</A>, <A HREF="../../../javax/microedition/m3g/IndexBuffer.html">IndexBuffer</A>, <A HREF="../../../javax/microedition/m3g/KeyframeSequence.html">KeyframeSequence</A>, <A HREF="../../../javax/microedition/m3g/Material.html">Material</A>, <A HREF="../../../javax/microedition/m3g/PolygonMode.html">PolygonMode</A>, <A HREF="../../../javax/microedition/m3g/Transformable.html">Transformable</A>, <A HREF="../../../javax/microedition/m3g/VertexArray.html">VertexArray</A>, <A HREF="../../../javax/microedition/m3g/VertexBuffer.html">VertexBuffer</A></DD>
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<DT>public abstract class <B>Object3D</B><DT>extends java.lang.Object</DL>
<P>
<p>An abstract base class for all objects that can be part of a 3Dworld. This includes the world itself, other scene graph nodes,animations, textures, and so on. In fact, everything in this APIis an Object3D, except for Loader, Transform, RayIntersection, andGraphics3D.</p><h3>Animation</h3><p>Animations are applied to an object and its descendants with the<code>animate</code> method in this class. The objects needed foranimation and their relationships are shown in the figure below.</p><center><img src="./doc-files/Object3D-animation.png"/></center><h3><a name="Find"></a>Finding objects</h3><p>Every Object3D can be assigned a <i>user ID</i>, either at authoringstage or at run time with the <code>setUserID</code> method. User IDsare typically used to find a known object in a scene loaded from a datastream.</p><p>The <code>find</code> method searches through all objects that are<i>reachable</i> from this object through a chain of references, andreturns the one with the given user ID. If there are multiple objectswith the same ID, the implementation may return any one of them.</p><p>An object <b>O</b> is defined to be reachable from itself and fromall objects from which there is a chain of direct references to it.The parent reference of a Node does not count as a direct reference.The same applies for hidden references, such as alignment targets,that can not be queried by the application.</p><p>The operation of <code>find</code> is illustrated in the figurebelow.</p><center><img src="./doc-files/Object3D-find.png"/></center><h3>Associated user data</h3><p>Object3D has an attribute called the <i>user object</i>. The userobject may contain any arbitrary Object, whose interpretation andusage are entirely up to each application. The user object is neveraccessed by the implementation.</p><p>If an Object3D is loaded from a file by the Loader, the user objectmay contain a Hashtable that stores byte array values keyed by Integers.This is the case when one or more <i>user parameters</i> are associatedwith the serialized Object3D; see also the file format specification.If there are no user parameters, the user object is initially set tonull.</p><p>A typical example of using this type of persistent user data isto include application parameters inside a scene graph, such as inmulti-level games, where a non-player character may have a series ofattributes such as hit strength, armor, initial health, and so on.Although it is possible to have this information in a separate file,it is neater, easier and less error prone to associate it directlywith the Object3D that represents the character.</p><h3>Instantiation</h3><p>Object3D is an abstract class, and therefore has no public constructors.When a class derived from Object3D is instantiated, the attributes inheritedfrom Object3D will have the following default values:</p><ul><li>user ID : 0</li><li>user object : null</li><li>animation tracks : none</li></ul>
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<DT><B>See Also:</B><DD><a href="../../../file-format.html#Object3D">Binary format</a></DL>
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<B>Method Summary</B></FONT></TD>
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<CODE> void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/m3g/Object3D.html#addAnimationTrack(javax.microedition.m3g.AnimationTrack)">addAnimationTrack</A></B>(<A HREF="../../../javax/microedition/m3g/AnimationTrack.html">AnimationTrack</A> animationTrack)</CODE>
<BR>
Adds the given AnimationTrack to this Object3D, potentially changing the order and indices of the previously added tracks. </TD>
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<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/m3g/Object3D.html#animate(int)">animate</A></B>(int time)</CODE>
<BR>
Updates all animated properties in this Object3D and all Object3Ds that are reachable from this Object3D. </TD>
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<CODE> <A HREF="../../../javax/microedition/m3g/Object3D.html">Object3D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/m3g/Object3D.html#duplicate()">duplicate</A></B>()</CODE>
<BR>
Creates a duplicate of this Object3D.</TD>
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<CODE> <A HREF="../../../javax/microedition/m3g/Object3D.html">Object3D</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/m3g/Object3D.html#find(int)">find</A></B>(int userID)</CODE>
<BR>
Retrieves an object that has the given user ID and is reachable from this object. </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> <A HREF="../../../javax/microedition/m3g/AnimationTrack.html">AnimationTrack</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/m3g/Object3D.html#getAnimationTrack(int)">getAnimationTrack</A></B>(int index)</CODE>
<BR>
Gets an AnimationTrack by index. </TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/m3g/Object3D.html#getAnimationTrackCount()">getAnimationTrackCount</A></B>()</CODE>
<BR>
Gets the number of AnimationTracks currently associated with this Object3D.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE> int</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../javax/microedition/m3g/Object3D.html#getReferences(javax.microedition.m3g.Object3D[])">getReferences</A></B>(<A HREF="../../../javax/microedition/m3g/Object3D.html">Object3D</A>[] references)</CODE>
<BR>
Returns the number of direct Object3D references in this⌨️ 快捷键说明
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