Java tutorial
/* 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.event.ActionEvent; import java.awt.event.ActionListener; import javax.media.j3d.AmbientLight; import javax.media.j3d.Appearance; import javax.media.j3d.BoundingSphere; import javax.media.j3d.BranchGroup; import javax.media.j3d.Canvas3D; import javax.media.j3d.Locale; import javax.media.j3d.Material; import javax.media.j3d.PhysicalBody; import javax.media.j3d.PhysicalEnvironment; import javax.media.j3d.SpotLight; 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.AxisAngle4d; import javax.vecmath.Color3f; import javax.vecmath.Point3d; import javax.vecmath.Point3f; import javax.vecmath.Vector3f; import com.sun.j3d.utils.geometry.Sphere; /** * This builds a red sphere using the Sphere utility class and adds lights so * that you can see it shape. It creates a material for the sphere, creates an * ambient light and a two spot lights of different colours. * * @author I.J.Palmer * @version 1.0 */ public class SimpleSpotLights extends Frame implements ActionListener { protected Canvas3D myCanvas3D = new Canvas3D(null); protected Button myButton = new Button("Exit"); /** * This function builds the view branch of the scene graph. It creates a * branch group and then creates the necessary view elements to give a * useful view of our content. * * @param c * Canvas3D that will display the view * @return BranchGroup that is the root of the view elements */ 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); ViewPlatform myViewPlatform = new ViewPlatform(); 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); return viewBranch; } /** * This creates some lights and adds them to the BranchGroup. * * @param b * BranchGroup that the lights are added to. */ protected void addLights(BranchGroup b) { // Create a bounds for the lights BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 100.0); //Set up the ambient light Color3f ambientColour = new Color3f(0.2f, 0.2f, 0.2f); AmbientLight ambientLight = new AmbientLight(ambientColour); ambientLight.setInfluencingBounds(bounds); Color3f blueColour = new Color3f(0.0f, 0.0f, 1.0f); Point3f bluePosition = new Point3f(1.8f, 1.8f, 1.8f); Point3f blueAtten = new Point3f(1.0f, 0.0f, 0.0f); Vector3f blueDir = new Vector3f(-1.0f, -1.0f, -1.0f); SpotLight blueLight = new SpotLight(blueColour, bluePosition, blueAtten, blueDir, (float) (Math.PI / 2.0), 0.0f); blueLight.setInfluencingBounds(bounds); Color3f greenColour = new Color3f(0.0f, 1.0f, 0.0f); Point3f greenPosition = new Point3f(0.0f, 0.0f, 3.0f); Point3f greenAtten = new Point3f(1.0f, 0.0f, 0.0f); Vector3f greenDir = new Vector3f(0.0f, 0.0f, -1.0f); SpotLight greenLight = new SpotLight(greenColour, greenPosition, greenAtten, greenDir, (float) (Math.PI / 2.0), 0.0f); greenLight.setInfluencingBounds(bounds); //Add the lights to the BranchGroup b.addChild(ambientLight); b.addChild(greenLight); b.addChild(blueLight); } /** * This build the content branch of our scene graph. It creates a transform * group so that the shape is slightly tilted to reveal its 3D shape. * * @param shape * Node that represents the geometry for the content * @return BranchGroup that is the root of the content branch */ protected BranchGroup buildContentBranch() { BranchGroup contentBranch = new BranchGroup(); Transform3D rotateCube = new Transform3D(); rotateCube.set(new AxisAngle4d(1.0, 1.0, 0.0, Math.PI / 4.0)); TransformGroup rotationGroup = new TransformGroup(rotateCube); contentBranch.addChild(rotationGroup); //Create a new appearance Appearance app = new Appearance(); //Create the colours for the material Color3f ambientColour = new Color3f(1.0f, 1.0f, 1.0f); Color3f diffuseColour = new Color3f(1.0f, 1.0f, 1.0f); Color3f specularColour = new Color3f(1.0f, 1.0f, 1.0f); Color3f emissiveColour = new Color3f(0.0f, 0.0f, 0.0f); //Define the shininess float shininess = 20.0f; //Set the material of the appearance app.setMaterial(new Material(ambientColour, emissiveColour, diffuseColour, specularColour, shininess)); //Create and add a new sphere using the appearance rotationGroup.addChild(new Sphere(2.0f, Sphere.GENERATE_NORMALS, 120, app)); //Use the addLights function to add the lights to the branch addLights(contentBranch); //Return the root of the content branch return contentBranch; } /** * Handles the exit button action to quit the program. */ public void actionPerformed(ActionEvent e) { dispose(); System.exit(0); } /** * This creates a default universe and locale, creates a window and uses the * functions defined in this class to build the view and content branches of * the scene graph. */ public SimpleSpotLights() { VirtualUniverse myUniverse = new VirtualUniverse(); Locale myLocale = new Locale(myUniverse); myLocale.addBranchGraph(buildViewBranch(myCanvas3D)); myLocale.addBranchGraph(buildContentBranch()); setTitle("SimpleDirLight"); setSize(400, 400); setLayout(new BorderLayout()); add("Center", myCanvas3D); add("South", myButton); myButton.addActionListener(this); setVisible(true); } public static void main(String[] args) { SimpleSpotLights spl = new SimpleSpotLights(); } }