• Author / Uploaded
• Javier Ruiz Thorrens

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21/05/13

Java 3D - Explore 3D Worlds

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Pyramid This example shows how to create geometry and use the normal generator so that you can add an appearance and lighting. import java.awt.Color; import com.sun.j3d.utils.geometry.GeometryInfo; import com.sun.j3d.utils.geometry.NormalGenerator; import com.sun.j3d.utils.universe.SimpleUniverse; import javax.media.j3d.*; import javax.vecmath.*; // An Egyptian pyramid // Base divided into two triangles public class PyramidExample { public static void main(String[] args) { SimpleUniverse universe = new SimpleUniverse(); BranchGroup group = new BranchGroup(); Point3f e = new Point3f(1.0f, 0.0f, 0.0f); // east Point3f s = new Point3f(0.0f, 0.0f, 1.0f); // south Point3f w = new Point3f(-1.0f, 0.0f, 0.0f); // west Point3f n = new Point3f(0.0f, 0.0f, -1.0f); // north Point3f t = new Point3f(0.0f, 0.721f, 0.0f); // top TriangleArray pyramidGeometry = new TriangleArray(18, TriangleArray.COORDINATES); pyramidGeometry.setCoordinate(0, e); pyramidGeometry.setCoordinate(1, t); pyramidGeometry.setCoordinate(2, s); pyramidGeometry.setCoordinate(3, s); pyramidGeometry.setCoordinate(4, t); pyramidGeometry.setCoordinate(5, w); pyramidGeometry.setCoordinate(6, w); pyramidGeometry.setCoordinate(7, t); pyramidGeometry.setCoordinate(8, n); pyramidGeometry.setCoordinate(9, n); pyramidGeometry.setCoordinate(10, t); pyramidGeometry.setCoordinate(11, e); www.java3d.org/samples.html

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pyramidGeometry.setCoordinate(12, e); pyramidGeometry.setCoordinate(13, s); pyramidGeometry.setCoordinate(14, w); pyramidGeometry.setCoordinate(15, w); pyramidGeometry.setCoordinate(16, n); pyramidGeometry.setCoordinate(17, e); GeometryInfo geometryInfo = new GeometryInfo(pyramidGeometry); NormalGenerator ng = new NormalGenerator(); ng.generateNormals(geometryInfo); GeometryArray result = geometryInfo.getGeometryArray(); // yellow appearance Appearance appearance = new Appearance(); Color3f color = new Color3f(Color.yellow); Color3f black = new Color3f(0.0f, 0.0f, 0.0f); Color3f white = new Color3f(1.0f, 1.0f, 1.0f); Texture texture = new Texture2D(); TextureAttributes texAttr = new TextureAttributes(); texAttr.setTextureMode(TextureAttributes.MODULATE); texture.setBoundaryModeS(Texture.WRAP); texture.setBoundaryModeT(Texture.WRAP); texture.setBoundaryColor(new Color4f(0.0f, 1.0f, 0.0f, 0.0f)); Material mat = new Material(color, black, color, white, 70f); appearance.setTextureAttributes(texAttr); appearance.setMaterial(mat); appearance.setTexture(texture); Shape3D shape = new Shape3D(result, appearance); group.addChild(shape); // above pyramid Vector3f viewTranslation = new Vector3f(); viewTranslation.z = 3; viewTranslation.x = 0f; viewTranslation.y = .3f; Transform3D viewTransform = new Transform3D(); viewTransform.setTranslation(viewTranslation); Transform3D rotation = new Transform3D(); rotation.rotX(-Math.PI / 12.0d); rotation.mul(viewTransform); universe.getViewingPlatform().getViewPlatformTransform().setTransform( rotation); universe.getViewingPlatform().getViewPlatformTransform().getTransform( viewTransform); // lights BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 1000.0); www.java3d.org/samples.html

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Color3f light1Color = new Color3f(.7f, .7f, .7f); Vector3f light1Direction = new Vector3f(4.0f, -7.0f, -12.0f); DirectionalLight light1 = new DirectionalLight(light1Color, light1Direction); light1.setInfluencingBounds(bounds); group.addChild(light1); Color3f ambientColor = new Color3f(.4f, .4f, .4f); AmbientLight ambientLightNode = new AmbientLight(ambientColor); ambientLightNode.setInfluencingBounds(bounds); group.addChild(ambientLightNode); universe.addBranchGraph(group); } }

Stereo 3D Example This example shows how to load a model and display it in 3D so that it can be viewed with red/green glasses. Move or spin the girl with the mouse. Use the arrow keys to move her backwards and forwards. View with red- green glasses to get the 3D effect.

If the applet doesn't load, see here for instructions.

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import java.applet.Applet; import java.awt.FlowLayout; import java.awt.event.*; import java.awt.GraphicsConfiguration; import com.sun.j3d.utils.applet.MainFrame; import com.sun.j3d.utils.universe.*; import javax.media.j3d.*; import javax.vecmath.*; import javax.swing.*; import com.sun.j3d.utils.behaviors.mouse.*; import com.sun.j3d.utils.behaviors.keyboard.KeyNavigatorBehavior; import com.sun.j3d.loaders.objectfile.ObjectFile; import com.sun.j3d.loaders.Scene; import java.net.URL; import java.util.Hashtable; import java.util.Enumeration; public class RedGreenGirl extends Applet { protected Canvas3D c1 = new Canvas3D(SimpleUniverse.getPreferredConfiguration()); // private Canvas3D c2 = new Canvas3D(SimpleUniverse.getPreferredConfiguration()); private static MainFrame mf; protected SimpleUniverse u = null; www.java3d.org/samples.html

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protected BranchGroup scene = null; protected String URLString = "http://www.java3d.org/renee.obj"; protected float eyeOffset =0.03F; protected static int size=600; public void init() { setLayout(new FlowLayout()); GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration(); String v = getParameter("url"); if (v != null) { URLString = v; } c1.setSize(size, size); add(c1); scene = createSceneGraph(0); u = new SimpleUniverse(c1); // This will move the ViewPlatform back a bit so the // objects in the scene can be viewed. //u.getViewingPlatform().setNominalViewingTransform(); u.addBranchGraph(scene); } public BranchGroup createSceneGraph(int i) { System.out.println("Creating scene for: "+URLString); // Create the root of the branch graph BranchGroup objRoot = new BranchGroup(); try{ Transform3D myTransform3D = new Transform3D(); myTransform3D.setTranslation(new Vector3f(+0.0f,-0.15f,-3.6f)); TransformGroup objTrans = new TransformGroup(myTransform3D); objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE); Transform3D t = new Transform3D(); TransformGroup tg = new TransformGroup(t); tg.setCapability(TransformGroup.ALLOW_TRANSFORM_READ); tg.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE); objTrans.addChild(tg); URL url = new URL(URLString) ; ObjectFile f = new ObjectFile(); f.setFlags(ObjectFile.RESIZE | ObjectFile.TRIANGULATE | ObjectFile.STRIPIFY); System.out.println( "About to load" ); Scene s = f.load(url); Transform3D myTrans = new Transform3D(); myTrans.setTranslation(new Vector3f(eyeOffset, -eyeOffset, 0F)); TransformGroup mytg = new TransformGroup(myTrans); //mytg.addChild(s.getSceneGroup()); tg.addChild(mytg); Transform3D myTrans2 = new Transform3D(); myTrans2.setTranslation(new Vector3f(-eyeOffset, +eyeOffset, 0F)); TransformGroup mytg2 = new TransformGroup(myTrans2); //mytg2.addChild(s.getSceneGroup()); Hashtable table = s.getNamedObjects(); www.java3d.org/samples.html

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for (Enumeration e = table.keys() ; e.hasMoreElements() ;) { Object key = e.nextElement(); System.out.println(key); Object obj = table.get(key); System.out.println(obj.getClass().getName()); Shape3D shape

= (Shape3D)obj;

//shape.setCapability(Shape3D.ALLOW_APPEARANCE_WRITE); Appearance ap = new Appearance(); Color3f black = new Color3f(0.0f, 0.0f, 0.0f); Color3f red = new Color3f(0.7f, .0f, .15f); Color3f green = new Color3f(0f, .7f, .15f); ap.setMaterial(new Material(green,black, green, black, 1.0f)); Appearance ap2 = new Appearance(); ap2.setMaterial(new Material(red, black, red, black, 1.0f)); float transparencyValue = 0.5f; TransparencyAttributes t_attr = new TransparencyAttributes( TransparencyAttributes.BLENDED, transparencyValue, TransparencyAttributes.BLEND_SRC_ALPHA, TransparencyAttributes.BLEND_ONE); ap2.setTransparencyAttributes( t_attr ); ap2.setRenderingAttributes( new RenderingAttributes() ); ap.setTransparencyAttributes( t_attr ); ap.setRenderingAttributes( new RenderingAttributes() ); // bg.addChild(ap); shape.setAppearance(ap); mytg2.addChild(new Shape3D(shape.getGeometry(),ap2)); mytg.addChild(new Shape3D(shape.getGeometry(),ap)); } tg.addChild(mytg2); System.out.println( "Finished Loading" ); BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0); Color3f light1Color = new Color3f(.9f, 0.9f, 0.9f); Vector3f light1Direction

= new Vector3f(4.0f, -7.0f, -12.0f);

DirectionalLight light1 = new DirectionalLight(light1Color, light1Direction); light1.setInfluencingBounds(bounds); objTrans.addChild(light1); // Set up the ambient light Color3f ambientColor = new Color3f(1.0f, .4f, 0.3f); AmbientLight ambientLightNode = new AmbientLight(ambientColor); ambientLightNode.setInfluencingBounds(bounds); objTrans.addChild(ambientLightNode);

MouseRotate behavior = new MouseRotate(); behavior.setTransformGroup(tg); objTrans.addChild(behavior); www.java3d.org/samples.html

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// Create the translate behavior node MouseTranslate behavior3 = new MouseTranslate(); behavior3.setTransformGroup(tg); objTrans.addChild(behavior3); behavior3.setSchedulingBounds(bounds); KeyNavigatorBehavior keyNavBeh = new KeyNavigatorBehavior(tg); keyNavBeh.setSchedulingBounds(new BoundingSphere( new Point3d(),1000.0)); objTrans.addChild(keyNavBeh); behavior.setSchedulingBounds(bounds); objRoot.addChild(objTrans); } catch(Throwable t){System.out.println("Error: "+t);} return objRoot; } public RedGreenGirl() { } public void destroy() { u.removeAllLocales(); } public static void main(String[] args) { RedGreenGirl s = new RedGreenGirl(); if (args.length > 0) { s.URLString = args[0]; } mf = new MainFrame(s, size, size); } }

Text 3D Example Here is an example of how to convert text into a 3D object.

import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.media.j3d.*; import javax.vecmath.*; import com.sun.j3d.utils.universe.*; import com.sun.j3d.utils.geometry.*; public class Titles {

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public static void main(String[] args) { Titles t = new Titles(); t.setUp(); } public void setUp() { JFrame jf = new JFrame("Welcome"); // kill the window on close jf.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent winEvent) { System.exit(0); } }); JPanel panel = new JPanel(); panel.setLayout(new GridLayout(1, 1, 2, 2)); GraphicsConfiguration config = SimpleUniverse .getPreferredConfiguration(); Canvas3D canvas3D = new Canvas3D(config); canvas3D.setSize(360, 160); SimpleUniverse universe = new SimpleUniverse(canvas3D); BranchGroup group = new BranchGroup(); addObjects(group); addLights(group); universe.getViewingPlatform().setNominalViewingTransform(); universe.addBranchGraph(group); panel.add(canvas3D); jf.getContentPane().add(panel, BorderLayout.CENTER); jf.pack(); jf.setVisible(true); } public void addLights(BranchGroup group) { BoundingSphere bounds = new BoundingSphere(new Point3d(0.0, 0.0, 0.0), 1000.0); Color3f light1Color = new Color3f(1.0f, 1.0f, 1.0f); Vector3f light1Direction = new Vector3f(4.0f, -7.0f, -12.0f); DirectionalLight light1 = new DirectionalLight(light1Color, light1Direction); light1.setInfluencingBounds(bounds); group.addChild(light1); // Set up the ambient light Color3f ambientColor = new Color3f(.1f, .1f, .1f); AmbientLight ambientLightNode = new AmbientLight(ambientColor); ambientLightNode.setInfluencingBounds(bounds); group.addChild(ambientLightNode); }

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private void addObjects(BranchGroup group) { Font3D f3d = new Font3D(new Font("TestFont", Font.PLAIN, 2), new FontExtrusion()); Text3D text = new Text3D(f3d, new String("Java3D.org"), new Point3f(-3.5f, -.5f, -4.5f)); text.setString("Java3D.org"); Color3f white = new Color3f(1.0f, 1.0f, 1.0f); Color3f blue = new Color3f(.2f, 0.2f, 0.6f); Appearance a = new Appearance(); Material m = new Material(blue, blue, blue, white, 80.0f); m.setLightingEnable(true); a.setMaterial(m); Shape3D sh = new Shape3D(); sh.setGeometry(text); sh.setAppearance(a); TransformGroup tg = new TransformGroup(); Transform3D t3d = new Transform3D(); Transform3D tDown = new Transform3D(); Transform3D rot = new Transform3D(); Vector3f v3f = new Vector3f(-1.6f, -1.35f, -6.5f); t3d.setTranslation(v3f); rot.rotX(Math.PI / 5); t3d.mul(rot); v3f = new Vector3f(0, -1.4f, 0f); tDown.setTranslation(v3f); t3d.mul(tDown); tg.setTransform(t3d); tg.addChild(sh); group.addChild(tg); } }

Icosahedron This example shows how to create an icosahedron and apply various appearances to it. It was donated Edward Eberle. IcosahedronPlus.jar is an executable jar file containing all the classes, sources and images. home

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