[JAVA3D] Urgent Need for help

Kapil Joshi Tue, 18 Sep 2001 00:49:47 -0700

hi,

i am a graduate student and have taken up a project in java and java3d. but being new to J3D i am not able to solve some problems.

[1] I have added a Canvas3D to a panel and i want to draw a simple line on the Canvas. i am using my own class for line (myLine2D) and converting it to Shape3D using a method 'getshape()' and adds it to scenegraph using method 'addShapeObject()'. Though the object is added to the TG node in the content branch, the Canvas is not displaying it. i am herewith sending the source file contents.

[2] Also when the Canvas3D object is added to the panel, the menus in the menubars are not displayed as the opaque canvas overlaps them.

please can anyone help me as early as possible? thanks!

-------------------------------------------------------------------------------------

[myLine2D.java]

package jpuf.geometry;

import javax.vecmath.*;
import javax.media.j3d.*;

public class myLine2D {
private float x1,y1,x2,y2;

public myLine2D(int x1,int y1,int x2,int y2)
{
    this.x1=(float)x1;
    this.y1=(float)y1;
    this.x2=(float)x2;
    this.y2=(float)y2;
}

public Shape3D getShape()
{
    Shape3D shape;
    float[] verts=
    {
      x1,y1,0.0f,
      x2,y2,0.0f
    };
/*    int[] stripVertexCount={1,1};
//    System.out.println("def:stripvc");
    LineStripArray lsa = new LineStripArray(2,LineStripArray.COORDINATES,stripVertexCount);
//    System.out.println("setcoords");
    lsa.setCoordinate(0,verts);
    System.out.println("No. of Strips : "+lsa.getNumStrips());
    System.out.println("No. of Vertices : "+lsa.getVertexCount());
    System.out.println("("+verts[0]+","+verts[1]+","+verts[2]+")");
    System.out.println("("+verts[3]+","+verts[4]+","+verts[5]+")");
    shape=new Shape3D(lsa,new Appearance());*/
//    System.out.println("def:shape3d");
    LineArray la=new LineArray(2,GeometryArray.COORDINATES);
    la.setCoordinate(0,verts);
    shape=new Shape3D(la,new Appearance());
    return shape;
}
}

-------------------------------------------------------------------------------------

[Model.java]

package jpuf;

import java.awt.*;
import javax.swing.*;
import jpuf.geometry.*; // OUR PACKAGE
import javax.vecmath.*;
import javax.media.j3d.*;

public class Model {

private VirtualUniverse VU;
private View v;
private TransformGroup TG;
private BranchGroup BG;
private Locale LC;
private Canvas3D c3d;

public Model(JPanel c)
{
    VirtualUniverse universe=new VirtualUniverse();
    this.VU=universe;
    Locale locale=new Locale(universe);
    this.LC=locale;
    locale.addBranchGraph(GenerateRightSubtree(c));
    locale.addBranchGraph(GenerateLeftSubtree());
}

private BranchGroup GenerateRightSubtree(JPanel c)
{
BranchGroup root=new BranchGroup();

    Transform3D t=new Transform3D();
    t.set(new Vector3f(0.0f,0.0f,10.0f));
    TransformGroup TG=new TransformGroup(t);

ViewPlatform vplat=new ViewPlatform();

PhysicalBody pbody = new PhysicalBody();
PhysicalEnvironment penv=new PhysicalEnvironment();

TG.addChild(vplat);
root.addChild(TG);

    View view=new View();
    this.v=view;
    this.c3d=new Canvas3D(null);
//    System.out.println(this.c3d.hashCode());
    this.c3d.setBackground(Color.white);
    this.c3d.setForeground(Color.black);
    c.add(c3d);
    view.addCanvas3D(this.c3d);

//    System.out.println(this.c3d);
//    System.out.println(this.c3d.isValid());
//    System.out.println(this.c3d.isVisible());
    view.attachViewPlatform(vplat);

view.setPhysicalBody(new PhysicalBody());
view.setPhysicalEnvironment(new PhysicalEnvironment());

root.setCapability(BG.ALLOW_CHILDREN_READ);

return(root);
}

private BranchGroup GenerateLeftSubtree()
{
    BranchGroup root=new BranchGroup();
    Transform3D t=new Transform3D();
    TransformGroup TG=new TransformGroup();
    this.TG=TG;
/* BoundingSphere bounds = new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);    (is it required?)
    TG.setBounds(bounds); */
    root.addChild(TG);
    this.BG=root;
    root.setCapability(BG.ALLOW_CHILDREN_READ);
    root.setCapability(root.ALLOW_CHILDREN_WRITE);
    root.setCapability(root.ALLOW_DETACH);
    return(root);
}

// [THIS METHOD ADDS A SHAPE3D OBJECT FROM OUTSIDE TO THE
// TRANSFORMGROUP NODE OF LEFT SUBTREE OF THE PREVIOUSLY
// CREATED SCENEGRAPH]

public void addShapeObject(Shape3D shape)
{
    this.c3d.stopRenderer();
//    System.out.println("addshapeobj:gotshape"+shape);
    shape.setPickable(true);
    shape.setCapability(shape.ALLOW_GEOMETRY_WRITE);
//    System.out.println("Live : "+this.TG.isLive());
    this.LC.removeBranchGraph(this.BG);
//    System.out.println("Live : "+this.TG.isLive());
    this.TG.addChild(shape);
//    System.out.println("attached:shape3d");
    this.LC.addBranchGraph(this.BG);
    this.c3d.startRenderer();
    /////////////////////////////////////////////////////
    System.out.println(this.c3d.hashCode());
    /////////////////////////////////////////////////////
//    System.out.println("Renderer : "+this.c3d.isRendererRunning()+"\tCanvas : "+this.c3d.isValid());
//    System.out.println("Canvas3D size : "+this.c3d.getSize());
    return;
}

// [for multiple windows]
public void newCanvas(Component c)
{
    this.c3d=new Canvas3D(null);
    v.addCanvas3D(this.c3d);
    System.out.println(this.c3d);
}

// [for multiple windows]
public Canvas3D getCanvas()        // returns canvas to main file for adding in a Jpanel
{
    this.c3d.setBackground(Color.blue);
    this.c3d.setForeground(Color.white);
    return this.c3d;
}

public void setCanvas(Canvas3D c) // This canvas is passed from main file .. and it overrides the original canvas created above
{
this.c3d=c;
}
}

[JAVA3D] Urgent Need for help

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