Java3DAPI文档资源-CSDN文库

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Java3D API文档是Java平台上的三维图形编程接口的官方参考指南，主要针对那些希望在Java应用程序中构建复杂、交互式3D图形的开发者。Java3D是建立在Java Foundation Classes (JFC) 和Java Media Framework (JMF) 之上的，它提供了丰富的功能来创建和操纵3D对象，使得开发者能够更容易地实现虚拟环境和复杂场景。在Java3D API中，主要包含以下几个关键概念和组件： 1. **Scene Graph**：场景图是Java3D的核心，它是一种数据结构，用于组织3D对象和它们之间的关系。场景图由节点组成，包括几何节点（Geometry）、变换节点（Transform）和叶子节点（如纹理和光源）。通过操作场景图，开发者可以控制物体的位置、旋转和缩放。 2. **Geometry**：几何节点代表了3D空间中的形状，如立方体、球体、多边形等。它们可以通过几何描述（如顶点、颜色和法线）来定义，并可以通过几何组合（如Union、Intersection或Difference）创建更复杂的形状。 3. **Transforms**：变换节点允许开发者对3D对象进行平移、旋转和缩放。这些变换可以应用于单个对象，也可以应用于整个场景图的一部分，从而实现复杂的运动和动画效果。 4. **Appearance**：外观定义了3D对象的颜色、材质、纹理和光照属性。Java3D提供了多种材质类型，如金属、塑料和玻璃，以及纹理映射功能，使得3D模型看起来更加真实。 5. **Lights**：光照在3D渲染中起着至关重要的作用，它可以模拟环境中的光线，影响物体的阴影和反射。Java3D支持多种类型的光源，如点光源、平行光和聚光灯。 6. **Viewing**：视图控制了观察3D世界的“相机”位置和方向。开发者可以设置视点的位置、视角、投影类型（正交或透视）以及视口大小。 7. **Compositors and Behaviors**：合成器（Compositors）负责组合多个视图，而行为（Behaviors）则允许开发者添加交互性，如响应用户输入或执行时间驱动的动画。 8. **拾取（Picking）**：Java3D提供了拾取机制，可以识别用户与3D场景中的哪些对象进行交互，这对于创建交互式应用非常有用。 9. **OpenGL绑定**：Java3D底层与OpenGL图形库紧密集成，这使得它能够利用硬件加速，提高性能和视觉质量。通过阅读"j3dguide"这样的Java3D API文档，开发者可以深入了解每个类和方法的用途，学习如何有效地使用这些工具来创建引人入胜的3D应用。文档通常会包含详细说明、示例代码和类层次结构，帮助开发者快速上手并解决实际问题。对于初学者和有经验的Java3D开发者来说，这份文档都是一个宝贵的资源，能帮助他们深入理解这个强大的3D图形库。

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Java3D API文档（1216个子文件）

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<html><head><title>Node Component Objects</title></head> <body bgcolor=#ffffff> <center> <table width=100% cellpadding="0" cellspacing="0" border="0"> <tr bgcolor="#cccccc"> <td align=left>   <font face="helvetica, arial" size="2"> The Java 3D API Specification</font> <td valign="top" align="right"> <a href="index.html"><img src="shared/toc01.gif" alt="Contents" width="30" height="26" border="0" VSPACE="0"></a> <a href="SceneGraphSharing.html"><img src="shared/prev01.gif" alt="Previous" width="30" height="26" border="0" VSPACE="0"></a> <a href="ViewModel.html"><img src="shared/next01.gif" alt="Next" width="30" height="26" border="0" VSPACE="0"></a> <a href="j3dIX.html"><img src="shared/index01.gif" alt="Index" width="30" height="26" border="0" VSPACE="0"</a> </td></tr> </table> <br> </center> <br> <center> <a name="47227"> <table width=90% border=0><tr> <td align=right><font size=3>C H A P T E R</font><font size=7><img src="shared/sm-space.gif"> 8</td></table> </a></center><center> <a name="51731"> <table width=90% border=0><tr><td align=right> <hr size=7 noshade> <font size=6>Node Component Objects</font></td></table> </a></center><blockquote> <p><br><br><br><P><a name="51734"> <font size=7><b>N</b></font>ODE component objects include the actual geometry and appearance attributes used to render the geometry.</a> <p><a name="66062"> <h2>8.1 <spacer type=block width=20>Node Component Objects: Attributes</h2> </a><a name="51735"> Node objects by themselves do not fully specify their exact semantics. They contain information that further refines their exact meaning. Some of that information is specified as an attribute and an associated floating-point or integer value. In many cases, however, the information consists of references to more complex entities called <em>node component objects</em>. Node component objects encapsulate related state information in a single entity. See <a href="Components.html#61722">Figure  8-1</a>.</a> <p><a name="75603"> <h3>8.1.1 <spacer type=block width=10>Alpha Object</h3> </a><a name="75604"> The Alpha node component object provides common methods for converting a time value into an alpha value (a value in the range 0.0 to 1.0). See <a href="Behaviorsa.html#51014">Section 10.6, "Interpolator Behaviors</a>," for a description of the Alpha object.</a> <p><a name="90906"> <h3>8.1.2 <spacer type=block width=10>Appearance Object</h3> </a><a name="90908"> The Appearance object is a component object of a Shape3D node that defines all rendering state attributes for that shape node. If the Appearance object in a Shape3D node is <code>null</code>, default values will be used for all rendering state attributes.</a> <p><a name="90909"> <h5> Constants</h5> </a><a name="90910"> The Appearance component object defines the following flags:</a> <p><a name="47320"> <img src="figures/Components.doc.anc.gif"></a> <p> <p> <a name="61722"> <ul><font size=-1><b><i>Figure 8-1 </i><img src="shared/sm-blank.gif" border=0> Attribute Component Object Hierarchy</b></font></ul> </a><p> <pre><b><a name="75584">public static final int ALLOW_MATERIAL_READ </a><a name="75586">public static final int ALLOW_MATERIAL_WRITE </a><a name="75588">public static final int ALLOW_TEXTURE_READ </a><a name="75590">public static final int ALLOW_TEXTURE_WRITE </a><a name="75592">public static final int ALLOW_TEXGEN_READ </a><a name="75594">public static final int ALLOW_TEXGEN_WRITE </a><a name="75596">public static final int ALLOW_TEXTURE_ATTRIBUTES_READ </a><a name="61740">public static final int ALLOW_TEXTURE_ATTRIBUTES_WRITE </a><a name="61752">public static final int ALLOW_COLORING_ATTRIBUTES_READ </a><a name="61761">public static final int ALLOW_COLORING_ATTRIBUTES_WRITE </a><a name="61768">public static final int ALLOW_TRANSPARENCY_ATTRIBUTES_READ </a><a name="61775">public static final int ALLOW_TRANSPARENCY_ATTRIBUTES_WRITE </a><a name="61784">public static final int ALLOW_RENDERING_ATTRIBUTES_READ </a><a name="61791">public static final int ALLOW_RENDERING_ATTRIBUTES_WRITE </a><a name="61800">public static final int ALLOW_POLYGON_ATTRIBUTES_READ </a><a name="61807">public static final int ALLOW_POLYGON_ATTRIBUTES_WRITE </a><a name="61814">public static final int ALLOW_LINE_ATTRIBUTES_READ </a><a name="61817">public static final int ALLOW_LINE_ATTRIBUTES_WRITE </a><a name="61824">public static final int ALLOW_POINT_ATTRIBUTES_READ </a><a name="61827">public static final int ALLOW_POINT_ATTRIBUTES_WRITE </a><a name="84582">public static final int ALLOW_TEXTURE_UNIT_STATE_READ </a><a name="84591">public static final int ALLOW_TEXTURE_UNIT_STATE_WRITE </a></b></pre><a name="47353"> These flags, when enabled using the <code>setCapability</code> method, allow an application to invoke methods that read and write the specified component object reference (material, texture, texture coordinate generation, and so forth). These capability flags are enforced only when the object is part of a live or compiled scene graph.</a> <p><a name="47354"> <h5> Constructors</h5> </a><a name="52729"> The Appearance object has the following constructor:</a> <p><pre><b><a name="52731">public Appearance() </a></b></pre><a name="73380"> Constructs and initializes an Appearance object using defaults for all state variables. All component object references are initialized to null.</a> <p><a name="47360"> <h5> Methods</h5> </a><a name="47361"> The Appearance object has the following methods:</a> <p><pre><b><a name="47363">public void setMaterial(Material material) </a><a name="47365">public Material getMaterial() </a></b></pre><a name="47367"> The Material object specifies the desired material properties used for lighting. Setting it to <code>null</code> disables lighting.</a> <p><pre><b><a name="47369">public void setTexture(Texture texture) </a><a name="64433">public Texture getTexture() </a></b></pre><a name="84620"> The Texture object specifies the desired texture map and texture parameters. Setting it to <code>null</code> disables texture mapping. Applications must not set individual texture component objects (texture, textureAttributes, or texCoordGeneration) and the texture unit state array in the same Appearance object. Doing so will result in an exception being thrown.</a> <p><pre><b><a name="61840">public void setTextureAttributes(TextureAttributes </a><a name="90748"> textureAttributes) </a><a name="61847">public TextureAttributes getTextureAttributes() </a></b></pre><a name="84787"> These methods set and retrieve the TextureAttributes object. Setting it to <code>null</code> results in default attribute use. Applications must not set individual texture component objects (texture, textureAttributes, or texCoordGeneration) and the texture unit state array in the same Appearance object. Doing so will result in an exception being thrown.</a> <p><pre><b><a name="84643">public void setColoringAttributes(ColoringAttributes </a><a name="90749"> coloringAttributes) </a><a name="68343">public ColoringAttributes getColoringAttributes() </a></b></pre><a name="68344"> These methods set and retrieve the ColoringAttributes object. Setting it to <code>null</code> results in default attribute use.</a> <p><pre><b><a name="68346">public void setTransparencyAttributes( </a><a name="90750"> TransparencyAttributes transparencyAttributes) </a><a name="61904">public TransparencyAttributes getTransparencyAttributes() </a></b></pre><a name="68350"> These methods set and retrieve the TransparencyAttributes object. Setting it to <code>null</code> results in default attribute use.</a> <p><pre><b><a name="61921">public void setRenderingAttributes(RenderingAttributes </a><a name="90751"> renderingAttributes) </a><a name="61936">public RenderingAttributes getRenderingAttributes() </a></b></pre><a name="68354"> These methods set and retrieve the RenderingAttributes object. Setting it to <code>null</code> results in default attribute use.</a> <p><pre><b><a name="61951"

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