<html><head><meta name="color-scheme" content="light dark"></head><body><pre style="word-wrap: break-word; white-space: pre-wrap;">package X3dForWebAuthors.Chapter07EventAnimationInterpolation;

import org.web3d.x3d.jsail.Core.*;
import org.web3d.x3d.jsail.fields.*;
import org.web3d.x3d.jsail.Geometry3D.*;
import org.web3d.x3d.jsail.Grouping.*;
import org.web3d.x3d.jsail.Interpolation.*;
import org.web3d.x3d.jsail.Navigation.*;
import org.web3d.x3d.jsail.Scripting.*;
import org.web3d.x3d.jsail.Shape.*;
import org.web3d.x3d.jsail.Text.*;
import org.web3d.x3d.jsail.Time.*;

// Javadoc metadata annotations follow, see below for X3DJSAIL Java source code.
/**
 * &lt;p&gt; Demonstrate use of PositionInterpolator and OrientationInterpolator to animate object motion, with console output tracing added for PositionInterpolator and ROUTE events. &lt;/p&gt;
 &lt;p&gt; Related links: Catalog page &lt;a href="../../../Chapter07EventAnimationInterpolation/PositionOrientationInterpolatorsExampleTracedIndex.html" target="_blank"&gt;PositionOrientationInterpolatorsExampleTraced&lt;/a&gt;,  source &lt;a href="../../../Chapter07EventAnimationInterpolation/PositionOrientationInterpolatorsExampleTraced.java"&gt;PositionOrientationInterpolatorsExampleTraced.java&lt;/a&gt;, &lt;a href="https://www.web3d.org/x3d/content/examples/X3dResources.html" target="_blank"&gt;X3D Resources&lt;/a&gt;, &lt;a href="https://www.web3d.org/x3d/content/examples/X3dSceneAuthoringHints.html" target="_blank"&gt;X3D Scene Authoring Hints&lt;/a&gt;, and &lt;a href="https://www.web3d.org/x3d/content/X3dTooltips.html" target="_blank"&gt;X3D Tooltips&lt;/a&gt;. &lt;/p&gt;
	&lt;table style="color:black; border:0px solid; border-spacing:10px 0px;"&gt;
        &lt;caption&gt;Scene Meta Information&lt;/caption&gt;
		&lt;tr style="background-color:silver; border-color:silver;"&gt;
			&lt;td style="text-align:center; padding:10px 0px;"&gt;&lt;i&gt;meta tags&lt;/i&gt;&lt;/td&gt;
			&lt;td style="text-align:left;   padding:10px 0px;"&gt;&amp;nbsp; Document Metadata &lt;/td&gt;
		&lt;/tr&gt;

		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; title &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="../../../Chapter07EventAnimationInterpolation/PositionOrientationInterpolatorsExampleTraced.x3d"&gt;PositionOrientationInterpolatorsExampleTraced.x3d&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; description &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; Demonstrate use of PositionInterpolator and OrientationInterpolator to animate object motion, with console output tracing added for PositionInterpolator and ROUTE events. &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; creator &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; Don Brutzman &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; created &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; 5 August 2011 &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; modified &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; 8 September 2024 &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; reference &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="../../../Chapter07EventAnimationInterpolation/Chapter07EventAnimationInterpolation-EventTracing.pdf"&gt;Chapter07EventAnimationInterpolation-EventTracing.pdf&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; reference &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="../../../Chapter07EventAnimationInterpolation/Chapter07EventAnimationInterpolation-10StepAnimationDesignProcess.pdf"&gt;Chapter07EventAnimationInterpolation-10StepAnimationDesignProcess.pdf&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; reference &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; PositionOrientationInterpolatorsExampleTracedConsole.txt &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; MovingImage &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="../../../Chapter07EventAnimationInterpolation/PositionOrientationInterpolatorsExample.mp4"&gt;PositionOrientationInterpolatorsExample.mp4&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; reference &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="../../../Chapter07EventAnimationInterpolation/PositionOrientationInterpolatorsExample.x3d"&gt;PositionOrientationInterpolatorsExample.x3d&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; reference &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="https://X3dGraphics.com" target="_blank"&gt;https://X3dGraphics.com&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; reference &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="https://www.web3d.org/x3d/content/examples/X3dResources.html" target="_blank"&gt;https://www.web3d.org/x3d/content/examples/X3dResources.html&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; rights &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; Copyright Don Brutzman and Leonard Daly 2007 &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; subject &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; X3D book, X3D graphics, X3D-Edit, &lt;a href="http://www.x3dGraphics.com" target="_blank"&gt;http://www.x3dGraphics.com&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; reference &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="https://savage.nps.edu/Savage/Tools/Animation/WaypointInterpolatorExample.x3d" target="_blank"&gt;https://savage.nps.edu/Savage/Tools/Animation/WaypointInterpolatorExample.x3d&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; identifier &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter07EventAnimationInterpolation/PositionOrientationInterpolatorsExampleTraced.x3d" target="_blank"&gt;https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter07EventAnimationInterpolation/PositionOrientationInterpolatorsExampleTraced.x3d&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; generator &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; X3D-Edit 3.3, &lt;a href="https://savage.nps.edu/X3D-Edit" target="_blank"&gt;https://savage.nps.edu/X3D-Edit&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr&gt;
			&lt;td style="text-align:right; vertical-align: text-top;"&gt; &lt;i&gt; license &lt;/i&gt; &lt;/td&gt;
			&lt;td&gt; &lt;a href="../../../Chapter07EventAnimationInterpolation/../license.html"&gt;../license.html&lt;/a&gt; &lt;/td&gt;
		&lt;/tr&gt;
		&lt;tr style="background-color:silver; border-color:silver;"&gt;
			&lt;td style="text-align:center;" colspan="2"&gt;  &amp;nbsp; &lt;/td&gt;
		&lt;/tr&gt;
	&lt;/table&gt;

	&lt;p&gt;
		This program uses the
		&lt;a href="https://www.web3d.org/specifications/java/X3DJSAIL.html" target="_blank"&gt;X3D Java Scene Access Interface Library (X3DJSAIL)&lt;/a&gt;.
		It has been produced using the 
		&lt;a href="https://www.web3d.org/x3d/stylesheets/X3dToJava.xslt" target="_blank"&gt;X3dToJava.xslt&lt;/a&gt;
		stylesheet
	       (&lt;a href="https://sourceforge.net/p/x3d/code/HEAD/tree/www.web3d.org/x3d/stylesheets/X3dToJava.xslt" target="_blank"&gt;version control&lt;/a&gt;)
                which is used to create Java source code from an original &lt;code&gt;.x3d&lt;/code&gt; model.
	&lt;/p&gt;

	* @author Don Brutzman
 */

public class PositionOrientationInterpolatorsExampleTraced
{
	/** Default constructor to create this object. */
	public PositionOrientationInterpolatorsExampleTraced ()
	{
	  initialize();
	}

	/** Create and initialize the X3D model for this object. */
	public final void initialize()
	{
            try { // catch-all
  x3dModel = new X3D().setProfile(X3D.PROFILE_IMMERSIVE).setVersion(X3D.VERSION_3_3)
  .setHead(new head()
    .addMeta(new meta().setName(meta.NAME_TITLE      ).setContent("PositionOrientationInterpolatorsExampleTraced.x3d"))
    .addMeta(new meta().setName(meta.NAME_DESCRIPTION).setContent("Demonstrate use of PositionInterpolator and OrientationInterpolator to animate object motion, with console output tracing added for PositionInterpolator and ROUTE events."))
    .addMeta(new meta().setName(meta.NAME_CREATOR    ).setContent("Don Brutzman"))
    .addMeta(new meta().setName(meta.NAME_CREATED    ).setContent("5 August 2011"))
    .addMeta(new meta().setName(meta.NAME_MODIFIED   ).setContent("8 September 2024"))
    .addMeta(new meta().setName(meta.NAME_REFERENCE  ).setContent("Chapter07EventAnimationInterpolation-EventTracing.pdf"))
    .addMeta(new meta().setName(meta.NAME_REFERENCE  ).setContent("Chapter07EventAnimationInterpolation-10StepAnimationDesignProcess.pdf"))
    .addMeta(new meta().setName(meta.NAME_REFERENCE  ).setContent("PositionOrientationInterpolatorsExampleTracedConsole.txt"))
    .addMeta(new meta().setName(meta.NAME_MOVINGIMAGE).setContent("PositionOrientationInterpolatorsExample.mp4"))
    .addMeta(new meta().setName(meta.NAME_REFERENCE  ).setContent("PositionOrientationInterpolatorsExample.x3d"))
    .addMeta(new meta().setName(meta.NAME_REFERENCE  ).setContent("https://X3dGraphics.com"))
    .addMeta(new meta().setName(meta.NAME_REFERENCE  ).setContent("https://www.web3d.org/x3d/content/examples/X3dResources.html"))
    .addMeta(new meta().setName(meta.NAME_RIGHTS     ).setContent("Copyright Don Brutzman and Leonard Daly 2007"))
    .addMeta(new meta().setName(meta.NAME_SUBJECT    ).setContent("X3D book, X3D graphics, X3D-Edit, http://www.x3dGraphics.com"))
    .addMeta(new meta().setName(meta.NAME_REFERENCE  ).setContent("https://savage.nps.edu/Savage/Tools/Animation/WaypointInterpolatorExample.x3d"))
    .addMeta(new meta().setName(meta.NAME_IDENTIFIER ).setContent("https://www.web3d.org/x3d/content/examples/X3dForWebAuthors/Chapter07EventAnimationInterpolation/PositionOrientationInterpolatorsExampleTraced.x3d"))
    .addMeta(new meta().setName(meta.NAME_GENERATOR  ).setContent("X3D-Edit 3.3, https://savage.nps.edu/X3D-Edit"))
    .addMeta(new meta().setName(meta.NAME_LICENSE    ).setContent("../license.html")))
  .setScene(new Scene()
    .addChild(new WorldInfo().setTitle("PositionOrientationInterpolatorsExampleTraced.x3d"))
    .addChild(new Viewpoint().setDescription("Animation demo").setOrientation(1.0,0.0,0.0,-0.588003).setPosition(0.0,8.0,12.0))
    .addChild(new Viewpoint().setDescription("View from above").setCenterOfRotation(5.0,0.1,5.0).setOrientation(1.0,0.0,0.0,-1.570796).setPosition(0.0,15.0,0.0))
    .addChild(new Transform("Pointer").setTranslation(1.0,0.0,1.0)
      .addChild(new Transform().setRotation(1.0,0.0,0.0,1.57)
        .addChild(new Shape()
          .setGeometry(new Cone().setBottomRadius(0.5).setHeight(1.5))
          .setAppearance(new Appearance()
            .setMaterial(new Material("ConeMaterial").setDiffuseColor(0.427451,1.0,0.160784))))))
    .addChild(new Shape("Floor")
      .setGeometry(new Box().setSize(12.0,0.05,12.0))
      .setAppearance(new Appearance()
        .setMaterial(new Material().setDiffuseColor(0.0,0.262745,0.941176))))
    .addComments(" note that final value equals first value in keyValue array in order to support smooth looping ")
    .addComments(" first drive around the location ")
    .addChild(new PositionInterpolator("PositionAnimator").setKey(new double[] {0.0,0.2,0.25,0.45,0.5,0.7,0.75,0.95,1.0}).setKeyValue(new MFVec3f(new double[] {-4.0,0.0,-4.0,-4.0,0.0,4.0,-4.0,0.0,4.0,4.0,0.0,4.0,4.0,0.0,4.0,4.0,0.0,-4.0,4.0,0.0,-4.0,-4.0,0.0,-4.0,-4.0,0.0,-4.0})))
    .addChild(new Group()
      .addComments(" ======= PositionInterpolator Trace ============================================== ")
      .addChild(new Script("Trace_ROUTE_PositionInterpolator_PositionAnimator").setMustEvaluate(true).setSourceCode("""
ecmascript:
    function value_changed (eventValue, timeStamp) {
      if (timeStamp - timeStampPreviousReport &gt;= reportInterval) {
        Browser.println ('Trace_ROUTE_PositionInterpolator_PositionAnimator type=SFVec3f value_changed=' + eventValue.toString());
        timeStampPreviousReport = timeStamp;
      }
    }
    function key (eventValue) {
      Browser.println ('Trace_ROUTE_PositionInterpolator_PositionAnimator type=MFFloat key=' + eventValue.toString());
    }
    function keyValue (eventValue) {
      Browser.println ('Trace_ROUTE_PositionInterpolator_PositionAnimator type=MFVec3f keyValue=' + eventValue.toString());
    }
""")
        .addField(new field().setName("reportInterval").setType(field.TYPE_SFTIME).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(1.0).setAppinfo("Sampling frequency in seconds (0 means all values)"))
        .addComments(" Trace ROUTEd values on X3D browser console ")
        .addField(new field().setName("value_changed").setType(field.TYPE_SFVEC3F).setAccessType(field.ACCESSTYPE_INPUTONLY))
        .addField(new field().setName("key").setType(field.TYPE_MFFLOAT).setAccessType(field.ACCESSTYPE_INPUTONLY))
        .addField(new field().setName("keyValue").setType(field.TYPE_MFVEC3F).setAccessType(field.ACCESSTYPE_INPUTONLY))
        .addField(new field().setName("timeStampPreviousReport").setType(field.TYPE_SFTIME).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(-1)))
      .addChild(new ROUTE().setFromNode("PositionAnimator").setFromField("value_changed").setToNode("Trace_ROUTE_PositionInterpolator_PositionAnimator").setToField("value_changed"))
      .addChild(new ROUTE().setFromNode("PositionAnimator").setFromField("key").setToNode("Trace_ROUTE_PositionInterpolator_PositionAnimator").setToField("key"))
      .addChild(new ROUTE().setFromNode("PositionAnimator").setFromField("keyValue").setToNode("Trace_ROUTE_PositionInterpolator_PositionAnimator").setToField("keyValue"))
      .addComments(" ======= PositionInterpolator Trace block complete ===================================================== "))
    .addChild(new ROUTE().setFromNode("PositionAnimator").setFromField("value_changed").setToNode("Pointer").setToField("translation"))
    .addChild(new Group()
      .addComments(" ======= ROUTE Trace ============================================== ")
      .addChild(new Script("Trace_ROUTE_PositionAnimator_value_changed_TO_Pointer_translation").setMustEvaluate(true).setSourceCode("""
ecmascript:
    function traceValue (eventValue, timeStamp) {
      // input eventValue received for trace field
      if (timeStamp - timeStampPreviousReport &gt;= reportInterval) {
        Browser.println ('Trace_ROUTE_PositionAnimator_value_changed_TO_Pointer_translation type=SFVec3f value=' + eventValue.toString());
        timeStampPreviousReport = timeStamp;
      }
    }
    function timeOfDay (someTime) {
      hh = Math.floor (someTime /(60*60)) % 24;
      mm = Math.floor (someTime / 60)     % 60;
      ss = Math.floor (someTime)          % 60;
      if (hh &lt; 9) hour   = '0' + hh;
      else        hour   =       hh;
      if (mm &lt; 9) minute = '0' + mm;
      else        minute =       mm;
      if (ss &lt; 9) second = '0' + ss;
      else        second =       ss;
      return '(' + hour + ':' + minute + ':' + second + ' GMT)';
    }
""")
        .addComments(" Trace ROUTEd values on X3D browser console ")
        .addField(new field().setName("reportInterval").setType(field.TYPE_SFTIME).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(1.0).setAppinfo("Sampling frequency in seconds (0 means all values)"))
        .addField(new field().setName("traceValue").setType(field.TYPE_SFVEC3F).setAccessType(field.ACCESSTYPE_INPUTONLY))
        .addField(new field().setName("timeStampPreviousReport").setType(field.TYPE_SFTIME).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(-1)))
      .addChild(new ROUTE().setFromNode("PositionAnimator").setFromField("value_changed").setToNode("Trace_ROUTE_PositionAnimator_value_changed_TO_Pointer_translation").setToField("traceValue"))
      .addComments(" ======= ROUTE Trace block complete ===================================================== "))
    .addComments(" then rotate the pointer to match next direction while paused at each position ")
    .addChild(new OrientationInterpolator("OrientationAnimator").setKey(new double[] {0.0,0.2,0.25,0.45,0.5,0.7,0.75,0.95,1.0}).setKeyValue(new MFRotation(new double[] {0.0,1.0,0.0,0.0,0.0,1.0,0.0,0.0,0.0,1.0,0.0,1.57,0.0,1.0,0.0,1.57,0.0,1.0,0.0,3.14,0.0,1.0,0.0,3.14,0.0,1.0,0.0,4.71,0.0,1.0,0.0,4.71,0.0,1.0,0.0,6.283})))
    .addComments(" final rotation value is 2pi rather than 0 so that rotation animation is smooth, not flip-flopping ")
    .addChild(new ROUTE().setFromNode("OrientationAnimator").setFromField("value_changed").setToNode("Pointer").setToField("set_rotation"))
    .addComments(" put TimeSensor clock last so that animation design pattern and ROUTE events flow upward ")
    .addChild(new TimeSensor("AnimationClock").setCycleInterval(10).setLoop(true))
    .addChild(new ROUTE().setFromNode("AnimationClock").setFromField("fraction_changed").setToNode("PositionAnimator").setToField("set_fraction"))
    .addChild(new Group()
      .addComments(" ======= ROUTE Trace ============================================== ")
      .addChild(new Script("Trace_ROUTE_AnimationClock_fraction_changed_TO_PositionAnimator_set_fraction").setMustEvaluate(true).setSourceCode("""
ecmascript:
    function traceValue (eventValue, timeStamp) {
      // input eventValue received for trace field
      if (timeStamp - timeStampPreviousReport &gt;= reportInterval) {
        Browser.println ('Trace_ROUTE_AnimationClock_fraction_changed_TO_PositionAnimator_set_fraction type=SFFloat value=' + eventValue);
        timeStampPreviousReport = timeStamp;
      }
    }
    function timeOfDay (someTime) {
      hh = Math.floor (someTime /(60*60)) % 24;
      mm = Math.floor (someTime / 60)     % 60;
      ss = Math.floor (someTime)          % 60;
      if (hh &lt; 9) hour   = '0' + hh;
      else        hour   =       hh;
      if (mm &lt; 9) minute = '0' + mm;
      else        minute =       mm;
      if (ss &lt; 9) second = '0' + ss;
      else        second =       ss;
      return '(' + hour + ':' + minute + ':' + second + ' GMT)';
    }
""")
        .addComments(" Trace ROUTEd values on X3D browser console ")
        .addField(new field().setName("reportInterval").setType(field.TYPE_SFTIME).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(1.0).setAppinfo("Sampling frequency in seconds (0 means all values)"))
        .addField(new field().setName("traceValue").setType(field.TYPE_SFFLOAT).setAccessType(field.ACCESSTYPE_INPUTONLY))
        .addField(new field().setName("timeStampPreviousReport").setType(field.TYPE_SFTIME).setAccessType(field.ACCESSTYPE_INITIALIZEONLY).setValue(-1)))
      .addChild(new ROUTE().setFromNode("AnimationClock").setFromField("fraction_changed").setToNode("Trace_ROUTE_AnimationClock_fraction_changed_TO_PositionAnimator_set_fraction").setToField("traceValue"))
      .addComments(" ======= ROUTE Trace block complete ===================================================== "))
    .addChild(new ROUTE().setFromNode("AnimationClock").setFromField("fraction_changed").setToNode("OrientationAnimator").setToField("set_fraction"))
    .addComments(" notice that explanatory Text is placed later in scene although it is graphically located above driving plane ")
    .addChild(new Transform().setTranslation(0.0,4.0,0.0)
      .addChild(new Billboard().setAxisOfRotation(0.0,0.0,0.0)
        .addChild(new Shape()
          .setGeometry(new Text().setString(new String[] {"Animation using PositionInterpolator","and OrientationInterpolator"})
            .setFontStyle(new FontStyle().setJustify(FontStyle.JUSTIFY_MIDDLE_MIDDLE).setSize(0.6)))
          .setAppearance(new Appearance()
            .setMaterial(new Material()))))));
            }
            catch (Exception ex)
            {       
                System.err.println ("*** Further hints on X3DJSAIL errors and exceptions at");
                System.err.println ("*** https://www.web3d.org/specifications/java/X3DJSAIL.html");
                throw (ex);
            }
	}
	// end of initialize() method

	/** The initialized model object, created within initialize() method. */
	private X3D x3dModel;

	/** 
	 * Provide a 
	 * &lt;a href="https://dzone.com/articles/java-copy-shallow-vs-deep-in-which-you-will-swim" target="_blank"&gt;shallow copy&lt;/a&gt;
	 * of the X3D model.
	 * @see &lt;a href="https://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/jsail/Core/X3D.html"&gt;X3D&lt;/a&gt;
	 * @return PositionOrientationInterpolatorsExampleTraced model
	 */
	public X3D getX3dModel()
	{	  
		return x3dModel;
	}
	   
    /** 
     * Default main() method provided for test purposes, uses CommandLine to set global ConfigurationProperties for this object.
     * @param args array of input parameters, provided as arguments
     * @see &lt;a href="https://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/jsail/Core/X3D.html#handleArguments-java.lang.String:A-"&gt;X3D.handleArguments(args)&lt;/a&gt;
     * @see &lt;a href="https://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/jsail/Core/X3D.html#validationReport--"&gt;X3D.validationReport()&lt;/a&gt;
     * @see &lt;a href="https://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/jsail/CommandLine.html"&gt;CommandLine&lt;/a&gt;
     * @see &lt;a href="https://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/jsail/CommandLine.html#USAGE"&gt;CommandLine.USAGE&lt;/a&gt;
     * @see &lt;a href="https://www.web3d.org/specifications/java/javadoc/org/web3d/x3d/jsail/ConfigurationProperties.html"&gt;ConfigurationProperties&lt;/a&gt;
     */
    public static void main(String args[])
    {
        System.out.println("Build this X3D model, showing validation diagnostics...");
        X3D thisExampleX3dModel = new PositionOrientationInterpolatorsExampleTraced().getX3dModel();
//      System.out.println("X3D model construction complete.");
	
        // next handle command line arguments
        boolean hasArguments = (args != null) &amp;&amp; (args.length &gt; 0);
        boolean validate = true; // default
        boolean argumentsLoadNewModel = false;
        String  fileName = new String();

        if (args != null)
        {
                for (String arg : args)
                {
                        if (arg.toLowerCase().startsWith("-v") || arg.toLowerCase().contains("validate"))
                        {
                                validate = true; // making sure
                        }
                        if (arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_X3D) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_CLASSICVRML) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_X3DB) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_VRML97) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_EXI) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_GZIP) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_ZIP) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_HTML) ||
                                arg.toLowerCase().endsWith(X3D.FILE_EXTENSION_XHTML))
                        {
                                argumentsLoadNewModel = true;
                                fileName = arg;
                        }
                }
        }
        if      (argumentsLoadNewModel)
                System.out.println("WARNING: \"X3dForWebAuthors.Chapter07EventAnimationInterpolation.PositionOrientationInterpolatorsExampleTraced\" model invocation is attempting to load file \"" + fileName + "\" instead of simply validating itself... file loading ignored.");
        else if (hasArguments) // if no arguments provided, this method produces usage warning
                thisExampleX3dModel.handleArguments(args);
	
        if (validate)
        {
            //  System.out.println("--- TODO fix duplicated outputs ---"); // omit when duplicated outputs problem is solved/refactored
		String validationResults = thisExampleX3dModel.validationReport();
            //  System.out.println("-----------------------------------"); // omit when duplicated outputs problem is solved/refactored
                System.out.print("X3dForWebAuthors.Chapter07EventAnimationInterpolation.PositionOrientationInterpolatorsExampleTraced self-validation test confirmation: ");
                if (!validationResults.equals("success"))
                    System.out.println();
                System.out.println(validationResults.trim());

                // experimental: test X3DJSAIL output files
                // Chapter07EventAnimationInterpolation/PositionOrientationInterpolatorsExampleTraced_JavaExport.* file validation is checked when building X3D Example Archives
                String filenameX3D  = "Chapter07EventAnimationInterpolation/PositionOrientationInterpolatorsExampleTraced_JavaExport.x3d"; 
                String filenameX3DV = "Chapter07EventAnimationInterpolation/PositionOrientationInterpolatorsExampleTraced_JavaExport.x3dv"; 
                String filenameJSON = "Chapter07EventAnimationInterpolation/PositionOrientationInterpolatorsExampleTraced_JavaExport.json";
                thisExampleX3dModel.toFileX3D        (filenameX3D);
                thisExampleX3dModel.toFileClassicVRML(filenameX3DV);
// TODO         thisExampleX3dModel.toFileJSON       (filenameJSON);
        }
    }
}
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