Three resolutions of a cylinder to demonstrate
/*
Essential Java 3D Fast
Ian Palmer
Publisher: Springer-Verlag
ISBN: 1-85233-394-4
*/
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Frame;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.media.j3d.AmbientLight;
import javax.media.j3d.Appearance;
import javax.media.j3d.BoundingLeaf;
import javax.media.j3d.BoundingSphere;
import javax.media.j3d.BranchGroup;
import javax.media.j3d.Canvas3D;
import javax.media.j3d.DirectionalLight;
import javax.media.j3d.DistanceLOD;
import javax.media.j3d.Locale;
import javax.media.j3d.Material;
import javax.media.j3d.PhysicalBody;
import javax.media.j3d.PhysicalEnvironment;
import javax.media.j3d.Switch;
import javax.media.j3d.Transform3D;
import javax.media.j3d.TransformGroup;
import javax.media.j3d.View;
import javax.media.j3d.ViewPlatform;
import javax.media.j3d.VirtualUniverse;
import javax.vecmath.Color3f;
import javax.vecmath.Point3d;
import javax.vecmath.Point3f;
import javax.vecmath.Vector3f;
import com.sun.j3d.utils.behaviors.keyboard.KeyNavigatorBehavior;
import com.sun.j3d.utils.geometry.Cylinder;
/**
* This uses three resolutions of a cylinder to demonstrate the operation of a
* level of detail node.
*
* @author I.J.Palmer
* @version 1.0
*/
public class SimpleLOD extends Frame implements ActionListener {
protected Canvas3D myCanvas3D = new Canvas3D(null);
protected Button exitButton = new Button("Exit");
protected BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0,
0.0), 100.0);
/**
* Build the view branch of the scene graph. In this case a key navigation
* utility object is created and associated with the view transform so that
* the view can be changed via the keyboard.
*
* @return BranchGroup that is the root of the view branch
*/
protected BranchGroup buildViewBranch(Canvas3D c) {
BranchGroup viewBranch = new BranchGroup();
Transform3D viewXfm = new Transform3D();
viewXfm.set(new Vector3f(0.0f, 0.0f, 10.0f));
TransformGroup viewXfmGroup = new TransformGroup(viewXfm);
viewXfmGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
viewXfmGroup.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
BoundingSphere movingBounds = new BoundingSphere(new Point3d(0.0, 0.0,
0.0), 100.0);
BoundingLeaf boundLeaf = new BoundingLeaf(movingBounds);
ViewPlatform myViewPlatform = new ViewPlatform();
viewXfmGroup.addChild(boundLeaf);
PhysicalBody myBody = new PhysicalBody();
PhysicalEnvironment myEnvironment = new PhysicalEnvironment();
viewXfmGroup.addChild(myViewPlatform);
viewBranch.addChild(viewXfmGroup);
View myView = new View();
myView.addCanvas3D(c);
myView.attachViewPlatform(myViewPlatform);
myView.setPhysicalBody(myBody);
myView.setPhysicalEnvironment(myEnvironment);
KeyNavigatorBehavior keyNav = new KeyNavigatorBehavior(viewXfmGroup);
keyNav.setSchedulingBounds(movingBounds);
viewBranch.addChild(keyNav);
return viewBranch;
}
/**
* Add some lights to the scene graph
*
* @param b
* BranchGroup that the lights are added to
*/
protected void addLights(BranchGroup b) {
Color3f ambLightColour = new Color3f(0.5f, 0.5f, 0.5f);
AmbientLight ambLight = new AmbientLight(ambLightColour);
ambLight.setInfluencingBounds(bounds);
Color3f dirLightColour = new Color3f(1.0f, 1.0f, 1.0f);
Vector3f dirLightDir = new Vector3f(-1.0f, -1.0f, -1.0f);
DirectionalLight dirLight = new DirectionalLight(dirLightColour,
dirLightDir);
dirLight.setInfluencingBounds(bounds);
b.addChild(ambLight);
b.addChild(dirLight);
}
/**
* Build the content branch for the scene graph This creates three
* cylinders, each with a different resolution. These are then used with a
* LOD node to implement a crude level of detail.
*
* @return BranchGroup that is the root of the content
*/
protected BranchGroup buildContentBranch() {
//Create the appearance
Appearance app = new Appearance();
Color3f ambientColour = new Color3f(1.0f, 1.0f, 0.0f);
Color3f emissiveColour = new Color3f(0.0f, 0.0f, 0.0f);
Color3f specularColour = new Color3f(1.0f, 1.0f, 1.0f);
Color3f diffuseColour = new Color3f(1.0f, 1.0f, 0.0f);
float shininess = 20.0f;
app.setMaterial(new Material(ambientColour, emissiveColour,
diffuseColour, specularColour, shininess));
//Make the switch node that is to used with the LOD
//and make it writable
Switch LODswitch = new Switch();
LODswitch.setCapability(Switch.ALLOW_SWITCH_WRITE);
//Add the three cylinders
LODswitch.addChild(new Cylinder(1.0f, 1.0f, Cylinder.GENERATE_NORMALS,
10, 10, app));
LODswitch.addChild(new Cylinder(1.0f, 1.0f, Cylinder.GENERATE_NORMALS,
5, 5, app));
LODswitch.addChild(new Cylinder(1.0f, 1.0f, Cylinder.GENERATE_NORMALS,
3, 3, app));
//Define the distances for the LOD
float[] LODdistances = { 5.0f, 10.0f, 15.0f };
DistanceLOD myLOD = new DistanceLOD(LODdistances, new Point3f(0.0f,
0.0f, 0.0f));
myLOD.setSchedulingBounds(bounds);
//Add the switch to the LOD
myLOD.addSwitch(LODswitch);
BranchGroup contentBranch = new BranchGroup();
contentBranch.addChild(myLOD);
addLights(contentBranch);
contentBranch.addChild(LODswitch);
return contentBranch;
}
/**
* Use the action event of the exit button to end the application.
*/
public void actionPerformed(ActionEvent e) {
dispose();
System.exit(0);
}
public SimpleLOD() {
VirtualUniverse myUniverse = new VirtualUniverse();
Locale myLocale = new Locale(myUniverse);
myLocale.addBranchGraph(buildViewBranch(myCanvas3D));
myLocale.addBranchGraph(buildContentBranch());
setTitle("SimpleLOD");
setSize(400, 400);
setLayout(new BorderLayout());
Panel bottom = new Panel();
bottom.add(exitButton);
add(BorderLayout.CENTER, myCanvas3D);
add(BorderLayout.SOUTH, bottom);
exitButton.addActionListener(this);
setVisible(true);
}
public static void main(String[] args) {
SimpleLOD sl = new SimpleLOD();
}
}
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