Assignment in java3d

Question

hi friends
i am preparing or constructing a game using java3d
details: the main aim of my game is
the cats will move on the floor in a room ...so that the rat have to move from one end to other end of the room with out any collision to cats.
every thing i have done except collision i.e when rat hits cat
i have a problem there...
here is the code
import com.sun.j3d.utils.behaviors.mouse.*;
import javax.vecmath.*;
import com.sun.j3d.utils.geometry.*;
import javax.media.j3d.*;
import javax.swing.JFrame;
import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.image.*;
import java.io.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import com.sun.j3d.loaders.objectfile.ObjectFile;
import com.sun.j3d.loaders.Scene;
import com.sun.j3d.loaders.ParsingErrorException;
import com.sun.j3d.loaders.IncorrectFormatException;
import java.util.Enumeration;
import com.sun.j3d.utils.behaviors.keyboard.*;
import java.awt.event.*;
import java.awt.AWTEvent;
import java.util.Enumeration;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
import com.sun.j3d.utils.applet.MainFrame;
import com.sun.j3d.utils.universe.*;
import javax.media.j3d.*;
import javax.vecmath.*;
public class objload1 extends Applet
private BranchGroup objects;
public objload1()
objects = new BranchGroup();
TransformGroup tg = new TransformGroup();
     ObjectFile OBJECT1 = new ObjectFile(ObjectFile.RESIZE);
     Scene SCENE1 = null;Scene SCENE2= null;Scene SCENE3= null;
     Scene SCENE4 = null;Scene SCENE5= null;Scene SCENE6= null;
     Scene SCENE7 = null;Scene SCENE9 =null;Scene SCENE10 =null;
try
     SCENE1 = OBJECT1.load(ClassLoader.getSystemResource("objects/fat cat.obj"));
     SCENE2 = OBJECT1.load(ClassLoader.getSystemResource("objects/fat cat.obj"));
     SCENE3 = OBJECT1.load(ClassLoader.getSystemResource("objects/fat cat.obj"));
     SCENE4 = OBJECT1.load(ClassLoader.getSystemResource("objects/earthelemental.obj"));     
     SCENE5 = OBJECT1.load(ClassLoader.getSystemResource("objects/drak.obj"));
     SCENE6 = OBJECT1.load(ClassLoader.getSystemResource("objects/drak.obj"));
     SCENE7 = OBJECT1.load(ClassLoader.getSystemResource("objects/drak.obj"));
     SCENE9 = OBJECT1.load(ClassLoader.getSystemResource("objects/fat cat.obj"));
     SCENE10 = OBJECT1.load(ClassLoader.getSystemResource("objects/earthelemental.obj")); //rat the main object
          catch (FileNotFoundException e)
          System.err.println(e);
          System.exit(1);
          catch (ParsingErrorException e)
          System.err.println(e);
          System.exit(1);
          catch (IncorrectFormatException e)
          System.err.println(e);
          System.exit(1);
// LOADING OBJECT1
TransformGroup obj11 = new TransformGroup();
obj11.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);     
obj11.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
TransformGroup obj1 = new TransformGroup();
obj1.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
obj1.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
obj11.addChild(SCENE1.getSceneGroup());
Transform3D t3d1 = new Transform3D();
     Alpha transAlpha1 = new Alpha(-1,
                    Alpha.INCREASING_ENABLE |
                    Alpha.DECREASING_ENABLE,
                    0, 0,
                    6000, 0, 0,
                    1000, 0, 0);
     t3d1.rotY(-Math.PI/-60.0);
               PositionInterpolator translator1 =
     new PositionInterpolator(transAlpha1, obj11,t3d1,5.0f,10.0f);
               BoundingSphere bounds1 =
     new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);// bounds are must
     translator1.setSchedulingBounds(bounds1);
     obj11.addChild(translator1);
     // translating the object
     Transform3D t3d11 = new Transform3D();
          t3d11.setTranslation(new Vector3f(-12.0f,1.0f,5.5f));
     obj1.setTransform(t3d11);
     obj1.addChild(obj11);     
     tg.addChild(obj1);
// LOADING OBJECT-2     
TransformGroup obj21 = new TransformGroup();
obj21.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);     
obj21.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
TransformGroup obj2 = new TransformGroup();
obj2.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
obj2.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
obj21.addChild(SCENE2.getSceneGroup());
Transform3D t3d2 = new Transform3D();
     Alpha transAlpha2 = new Alpha(-1,
                    Alpha.INCREASING_ENABLE |
                    Alpha.DECREASING_ENABLE,
                    0, 0,
                    10000, 0, 0,
                    1000, 0, 0);
     t3d2.rotX(-Math.PI/-60.0);
               PositionInterpolator translator2 =
     new PositionInterpolator(transAlpha2, obj21,t3d2,2.0f,10.0f);
               BoundingSphere bounds2 =
     new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);// bounds are must
     translator2.setSchedulingBounds(bounds2);
     obj21.addChild(translator2);
     // translating the object2
     Transform3D t3d21 = new Transform3D();
          t3d21.setTranslation(new Vector3f(-12.0f,1.0f,9.5f));
     obj2.setTransform(t3d21);
     obj2.addChild(obj21);     
     tg.addChild(obj2);
// LOADING OBJECT-3     
TransformGroup obj31 = new TransformGroup();
obj31.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);     
obj31.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
TransformGroup obj3 = new TransformGroup();
obj3.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
obj3.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
obj31.addChild(SCENE3.getSceneGroup());
Transform3D t3d3 = new Transform3D();
     Alpha transAlpha3 = new Alpha(-1,
                    Alpha.INCREASING_ENABLE |
                    Alpha.DECREASING_ENABLE,
                    0, 0,
                    1000, 0, 0,
                    1000, 0, 0);
     t3d3.rotY(-Math.PI/-60.0);
               PositionInterpolator translator3 =
     new PositionInterpolator(transAlpha3, obj31,t3d3,2.0f,10.0f);
               BoundingSphere bounds3 =
     new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);// bounds are must
     translator3.setSchedulingBounds(bounds3);
     obj31.addChild(translator3);
     // translating the object3
     Transform3D t3d31 = new Transform3D();
          t3d31.setTranslation(new Vector3f(-8.0f,1.0f,11.5f));
     obj3.setTransform(t3d31);
     obj3.addChild(obj31);     
     tg.addChild(obj3);
// LOADING OBJECT-4
               TransformGroup obj41 = new TransformGroup();
obj41.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);     
obj41.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
TransformGroup obj4 = new TransformGroup();
obj4.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
obj4.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
obj41.addChild(SCENE4.getSceneGroup());
Transform3D t3d4 = new Transform3D();
     Alpha transAlpha4 = new Alpha(-1,
                    Alpha.INCREASING_ENABLE |
                    Alpha.DECREASING_ENABLE,
                    0, 0,
                    9000, 0, 0,
                    1000, 0, 0);
     t3d4.rotY(-Math.PI/-60.0);
               PositionInterpolator translator4 =
     new PositionInterpolator(transAlpha4, obj41,t3d4,5.0f,10.0f);
               BoundingSphere bounds4 =
     new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);// bounds are must
     translator4.setSchedulingBounds(bounds4);
     obj41.addChild(translator4);
     // translating the object
     Transform3D t3d41 = new Transform3D();
          t3d41.setTranslation(new Vector3f(-9.0f,1.0f,-1.5f));
     obj4.setTransform(t3d41);
     obj4.addChild(obj41);     
     tg.addChild(obj4);
// LOADING OBJECT-5
               TransformGroup obj51 = new TransformGroup();
obj51.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);     
obj51.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
TransformGroup obj5 = new TransformGroup();
obj5.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
obj5.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
obj51.addChild(SCENE5.getSceneGroup());
Transform3D t3d5 = new Transform3D();
     Alpha transAlpha5 = new Alpha(-1,
                    Alpha.INCREASING_ENABLE |
                    Alpha.DECREASING_ENABLE,
                    0, 0,
                    6000, 0, 0,
                    1000, 0, 0);
     t3d5.rotY(-Math.PI/-60.0);
               PositionInterpolator translator5 =
     new PositionInterpolator(transAlpha5, obj51,t3d5,5.0f,10.0f);
               BoundingSphere bounds5 =
     new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);// bounds are must
     translator5.setSchedulingBounds(bounds5);
     obj51.addChild(translator5);
     // translating the object
     Transform3D t3d51 = new Transform3D();
          t3d51.setTranslation(new Vector3f(-5.0f,1.0f,-3.5f));
     obj5.setTransform(t3d51);
     obj5.addChild(obj51);     
     tg.addChild(obj5);
// LOADING OBJECT-6
TransformGroup obj6 = new TransformGroup();
obj6.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
obj6.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
obj6.addChild(SCENE6.getSceneGroup());
Transform3D t3d6 = new Transform3D();
Alpha alpha6 = new Alpha(-1,12000);
Point3f[] positions = new Point3f[6];
float[] knots = {0.0f,0.2f,0.4f,0.6f,0.8f,1.0f};
AxisAngle4f axis = new AxisAngle4f(1.0f,0.0f,0.0f,0.0f);
t3d6.set(axis);
positions[0] = new Point3f(-12.0f,1.0f,-20.0f);
positions[1] = new Point3f(12.0f,1.0f,-15.0f);
positions[2] = new Point3f(-12.0f,1.0f,2.0f);
positions[3] = new Point3f(12.0f,1.0f,12.0f);
positions[4] = new Point3f(-12.0f,1.0f,17.0f);
positions[5] = new Point3f(-12.0f,1.0f,-20.0f);
PositionPathInterpolator pospath = new PositionPathInterpolator(
     alpha6, obj6, t3d6,knots,positions);
pospath.setSchedulingBounds(new BoundingSphere());
obj6.addChild(pospath);
tg.addChild(obj6);
// LOADING OBJECT-7
TransformGroup obj7 = new TransformGroup();
obj7.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
obj7.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
obj7.addChild(SCENE7.getSceneGroup());
Transform3D t3d7 = new Transform3D();
Alpha alpha7 = new Alpha(-1,13000);
Point3f[] positions7 = new Point3f[11];
float[] knots7 = {0.0f,0.1f,0.2f,0.3f,0.4f,0.5f,0.6f,0.7f,0.8f,0.9f,1.0f};
AxisAngle4f axis7 = new AxisAngle4f(1.0f,0.0f,0.0f,0.0f);
t3d7.set(axis7);
positions7[0] = new Point3f(-14.0f,1.0f,-20.0f);
positions7[1] = new Point3f(14.0f,1.0f,-20.0f);
positions7[2] = new Point3f(0.0f,1.0f,-10.0f);
positions7[3] = new Point3f(-14.0f,1.0f,-10.0f);
positions7[4] = new Point3f(0.0f,1.0f,-5.0f);
positions7[5] = new Point3f(14.0f,1.0f,-5.0f);
positions7[6] = new Point3f(0.0f,1.0f,0.0f);
positions7[7] = new Point3f(-14f,1.0f,-3f);
positions7[8] = new Point3f(-7f,1.0f,13f);
positions7[9] = new Point3f(7f,1.0f,13f);
positions7[10] = new Point3f(-14.0f,1.0f,-20.0f);
PositionPathInterpolator pospath7 = new PositionPathInterpolator(
     alpha7, obj7, t3d7,knots7,positions7);
pospath7.setSchedulingBounds(new BoundingSphere());
obj7.addChild(pospath7);
tg.addChild(obj7);
// LOADING OBJECT-9
TransformGroup obj9 = new TransformGroup();
obj9.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
obj9.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
obj9.addChild(SCENE9.getSceneGroup());
Transform3D t3d9 = new Transform3D();
Alpha alpha9 = new Alpha(-1,7000);
Point3f[] positions9 = new Point3f[11];
float[] knots9 = {0.0f,0.1f,0.2f,0.3f,0.4f,0.5f,0.6f,0.7f,0.8f,0.9f,1.0f};
AxisAngle4f axis9 = new AxisAngle4f(1.0f,0.0f,0.0f,0.0f);
t3d9.set(axis9);
positions9[0] = new Point3f(-12.0f,1.0f,-20.0f);
positions9[1] = new Point3f(12.0f,1.0f,-20.0f);
positions9[2] = new Point3f(0.0f,1.0f,-10.0f);
positions9[3] = new Point3f(-12.0f,1.0f,-10.0f);
positions9[4] = new Point3f(0.0f,1.0f,-5.0f);
positions9[5] = new Point3f(12.0f,1.0f,-5.0f);
positions9[6] = new Point3f(0.0f,1.0f,0.0f);
positions9[7] = new Point3f(-12f,1.0f,-3f);
positions9[8] = new Point3f(-10f,1.0f,13f);
positions9[9] = new Point3f(10f,1.0f,13f);
positions9[10] = new Point3f(-12.0f,1.0f,-20.0f);
PositionPathInterpolator pospath9 = new PositionPathInterpolator(
     alpha9, obj9, t3d9,knots9,positions9);
pospath9.setSchedulingBounds(new BoundingSphere());
obj9.addChild(pospath9);
tg.addChild(obj9);
// LOADING 3DS OBJECT-10 main object
TransformGroup obj10 = new TransformGroup();
obj10.setCapability(TransformGroup.ALLOW_TRANSFORM_READ);
obj10.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
obj10.setCapability(TransformGroup.ALLOW_COLLISION_BOUNDS_READ);
     obj10.setCapability(TransformGroup.ALLOW_COLLISION_BOUNDS_WRITE);
obj10.addChild(SCENE10.getSceneGroup());
Transform3D t3d10 = new Transform3D();
          t3d10.setTranslation(new Vector3f(0.0f,1.0f,15.0f));
     obj10.setTransform(t3d10);
KeyBehavior keyBeh = new KeyBehavior( obj10);
keyBeh.setSchedulingBounds(new BoundingSphere(new Point3d(),1000.0));
obj10.addChild(keyBeh);
tg.addChild(obj10);
//-----------------------------------COLLISION DETECTION------------------------------------
CollisionDetector cd = new CollisionDetector(obj10);
          BoundingSphere bounds =
               new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
               cd.setSchedulingBounds(bounds);
          // Add the behavior to the scene graph
//tg.addChild(obj9);
// ADDING tg TO BRANCHGROUP
objects.addChild(tg);
          public BranchGroup obj()
          return objects;
====================================================
here is collision detection code
import java.util.Enumeration;
import javax.media.j3d.*;
import javax.vecmath.*;
public class CollisionDetector extends Behavior
private boolean inCollision = false;
private WakeupOnCollisionEntry wEnter;
private WakeupOnCollisionExit wExit;
private TransformGroup tg;
     public CollisionDetector(TransformGroup tg)
          this.tg = tg;
          inCollision = false;
     public void initialize()
     tg.setCapability(TransformGroup.ALLOW_COLLISION_BOUNDS_READ);
     tg.setCapability(TransformGroup.ALLOW_COLLISION_BOUNDS_WRITE);
          wEnter = new WakeupOnCollisionEntry(tg);
          wExit = new WakeupOnCollisionExit(tg);
          wakeupOn(wEnter);
public void processStimulus(Enumeration criteria)
     inCollision = !inCollision;
     if(!inCollision)
     wakeupOn(wEnter);
i tried in so may ways to detect a collision but i dint get it. so i thing any of the members in this forum can help. its urgent for me i have to submit my assignment next week. so plz help
regards
satish

Answer 1

Hi Satish
I am also doing the same Task and stuck with collision part. Plz let me know if you get the same.
Your code is missiting KeyBehavio class can you plz share it.
Santosh
[email protected]