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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN""http://www.w3.org/TR/REC-html40/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Sun Jun 23 01:50:35 PDT 2002 --><TITLE>PointLight (Java 3D API)</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"></HEAD><SCRIPT>function asd(){parent.document.title="PointLight (Java 3D API)";}</SCRIPT><BODY BGCOLOR="white" onload="asd();"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=3 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../javax/media/j3d/PointAttributes.html"><B>PREV CLASS</B></A> <A HREF="../../../javax/media/j3d/PointSound.html"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="PointLight.html" TARGET="_top"><B>NO FRAMES</B></A> <SCRIPT> <!-- if(window==top) { document.writeln('<A HREF="../../../allclasses-noframe.html" TARGET=""><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT><A HREF="../../../allclasses-noframe.html" TARGET=""><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: <A HREF="#field_detail">FIELD</A> | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.media.j3d</FONT><BR>Class PointLight</H2><PRE>java.lang.Object | +--<A HREF="../../../javax/media/j3d/SceneGraphObject.html">javax.media.j3d.SceneGraphObject</A> | +--<A HREF="../../../javax/media/j3d/Node.html">javax.media.j3d.Node</A> | +--<A HREF="../../../javax/media/j3d/Leaf.html">javax.media.j3d.Leaf</A> | +--<A HREF="../../../javax/media/j3d/Light.html">javax.media.j3d.Light</A> | +--<B>javax.media.j3d.PointLight</B></PRE><DL><DT><B>Direct Known Subclasses:</B> <DD><A HREF="../../../javax/media/j3d/SpotLight.html">SpotLight</A></DD></DL><HR><DL><DT>public class <B>PointLight</B><DT>extends <A HREF="../../../javax/media/j3d/Light.html">Light</A></DL><P>The PointLight object specifies an attenuated light source at a fixed point in space that radiates light equally in all directions away from the light source. PointLight has the same attributes as a Light node, with the addition of location and attenuation parameters. <p> A point light contributes to diffuse and specular reflections, which in turn depend on the orientation and position of a surface. A point light does not contribute to ambient reflections. <p> A PointLight is attenuated by multiplying the contribution of the light by an attenuation factor. The attenuation factor causes the the PointLight's brightness to decrease as distance from the light source increases. A PointLight's attenuation factor contains three values: <P><UL> <LI>Constant attenuation</LI> <LI>Linear attenuation</LI> <LI>Quadratic attenuation</LI></UL> <p> A PointLight is attenuated by the reciprocal of the sum of: <p> <ul> The constant attenuation factor<br> The Linear attenuation factor times the distance between the light and the vertex being illuminated<br> The quadratic attenuation factor times the square of the distance between the light and the vertex </ul> <p> By default, the constant attenuation value is 1 and the other two values are 0, resulting in no attenuation.<P><P><HR><P><!-- ======== NESTED CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="field_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Field Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/PointLight.html#ALLOW_ATTENUATION_READ">ALLOW_ATTENUATION_READ</A></B></CODE><BR> Specifies that this PointLight node allows reading its attenuation information.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/PointLight.html#ALLOW_ATTENUATION_WRITE">ALLOW_ATTENUATION_WRITE</A></B></CODE><BR> Specifies that this PointLight node allows writing its attenuation information.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/PointLight.html#ALLOW_POSITION_READ">ALLOW_POSITION_READ</A></B></CODE><BR> Specifies that this PointLight node allows reading its position information.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>static int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/media/j3d/PointLight.html#ALLOW_POSITION_WRITE">ALLOW_POSITION_WRITE</A></B></CODE><BR> Specifies that this PointLight node allows writing its position information.</TD></TR></TABLE> <A NAME="fields_inherited_from_class_javax.media.j3d.Light"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class javax.media.j3d.<A HREF="../../../javax/media/j3d/Light.html">Light</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../javax/media/j3d/Light.html#ALLOW_COLOR_READ">ALLOW_COLOR_READ</A>, <A HREF="../../../javax/media/j3d/Light.html#ALLOW_COLOR_WRITE">ALLOW_COLOR_WRITE</A>, <A HREF="../../../javax/media/j3d/Light.html#ALLOW_INFLUENCING_BOUNDS_READ">ALLOW_INFLUENCING_BOUNDS_READ</A>, <A HREF="../../../javax/media/j3d/Light.html#ALLOW_INFLUENCING_BOUNDS_WRITE">ALLOW_INFLUENCING_BOUNDS_WRITE</A>, <A HREF="../../../javax/media/j3d/Light.html#ALLOW_SCOPE_READ">ALLOW_SCOPE_READ</A>, <A HREF="../../../javax/media/j3d/Light.html#ALLOW_SCOPE_WRITE">ALLOW_SCOPE_WRITE</A>, <A HREF="../../../javax/media/j3d/Light.html#ALLOW_STATE_READ">ALLOW_STATE_READ</A>, <A HREF="../../../javax/media/j3d/Light.html#ALLOW_STATE_WRITE">ALLOW_STATE_WRITE</A></CODE></TD></TR></TABLE> <A NAME="fields_inherited_from_class_javax.media.j3d.Node"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class javax.media.j3d.<A HREF="../../../javax/media/j3d/Node.html">Node</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../javax/media/j3d/Node.html#ALLOW_AUTO_COMPUTE_BOUNDS_READ">ALLOW_AUTO_COMPUTE_BOUNDS_READ</A>, <A HREF="../../../javax/media/j3d/Node.html#ALLOW_AUTO_COMPUTE_BOUNDS_WRITE">ALLOW_AUTO_COMPUTE_BOUNDS_WRITE</A>, <A HREF="../../../javax/media/j3d/Node.html#ALLOW_BOUNDS_READ">ALLOW_BOUNDS_READ</A>, <A HREF="../../../javax/media/j3d/Node.html#ALLOW_BOUNDS_WRITE">ALLOW_BOUNDS_WRITE</A>, <A HREF="../../../javax/media/j3d/Node.html#ALLOW_COLLIDABLE_READ">ALLOW_COLLIDABLE_READ</A>, <A HREF="../../../javax/media/j3d/Node.html#ALLOW_COLLIDABLE_WRITE">ALLOW_COLLIDABLE_WRITE</A>, <A HREF="../../../javax/media/j3d/Node.html#ALLOW_LOCAL_TO_VWORLD_READ">ALLOW_LOCAL_TO_VWORLD_READ</A>, <A HREF="../../../javax/media/j3d/Node.html#ALLOW_PICKABLE_READ">ALLOW_PICKABLE_READ</A>, <A HREF="../../../javax/media/j3d/Node.html#ALLOW_PICKABLE_WRITE">ALLOW_PICKABLE_WRITE</A>, <A HREF="../../../javax/media/j3d/Node.html#ENABLE_COLLISION_REPORTING">ENABLE_COLLISION_REPORTING</A>, <A HREF="../../../javax/media/j3d/Node.html#ENABLE_PICK_REPORTING">ENABLE_PICK_REPORTING</A></CODE></TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/media/j3d/PointLight.html#PointLight()">PointLight</A></B>()</CODE><BR> Constructs a PointLight node with default parameters.</TD>⌨️ 快捷键说明
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