Re: [JAVA3D] I want to move loaded shapes!!

[Ewan Borland]

Whenever you laod a model using a loader you didn't create it can be useful to find all the nodes of a certain type and perform some action on them.

 

Here's some code that traverses the full graph from any Scene and recovers all of the Shape3D nodes. Obviouslly it's very easy to modify this to find whatever kind of node you are looking for. Think I got it from a previous post on the list. Remember to call this before making your scene live.

Hope it helps,

 

-Ewan

 

private  Vector    shape3Ds                      = null;

private  HashSet visitedSharedGroups    = null;

 

private void setCapabilities(Scene scene)

{

    shape3Ds = new Vector();

    visitedSharedGroups = new HashSet();

    retrieveShape3Ds(scene.getSceneGroup());

 

    Enumeration e = shape3Ds.elements();

    while (e.hasMoreElements())

    {

        Shape3D shape = (Shape3D)e.nextElement();

        shape.setCapability(...);

    }

 

// Retrieve all the Shape3D nodes contained in the scene graph starting at root

private void retrieveShape3Ds(Node root) throws CapabilityNotSetException
{
    // If this is a null tree then return

    if (root == null)
        return;

 

    // If the root is a shared group then make sure it hasn't already been considered

    if (root instanceof SharedGroup)

    {

        // If it has been visited previously then return

        if (visitedSharedGroups.contains(root))
            return;

 

       // If not then add it to the list of visited shared groups
       else
           visitedSharedGroups.add(root);

    }

 

    // If the current root node is a Shape3D then add it to the list of Shape3Ds

    if (root instanceof Shape3D)
        shapes.add(root);

 

    // If root is a group then traverse all of its children

    else if (root instanceof Group)

    {
        Enumeration e = ((Group)root).getAllChildren();
        while(e.hasMoreElements())
            retrieveShape3Ds((Node)e.nextElement());

    }

 

    // If root is a link then traverse its shared group
    else if (root instanceof Link)
        retrieveShape3Ds(((Link)root).getSharedGroup());

 

}

 

----- Original Message -----

From: "Alessandro Borges" <[EMAIL PROTECTED]>

To: <[EMAIL PROTECTED]>

Sent: Sunday, July 20, 2003 1:20 PM

Subject: Re: [JAVA3D] I want to move loaded shapes!!

> Hi
> I guess the nodes of a loaded .obj are Shapes3D. And the nodes of a
> loaded vrml are TGs...
> I think you can get  all nodes BEFORE inserting it in the scene graph,
> and set your capabilities:
>
> something like:
>
> Hashtable hash = scene.getNamedObjects();
> for (Enumeration e = hash.keys() ; e.hasMoreElements() ;)
>    {
>         Object obj = hash.getElement(e);
>          if (obj instanceOf Shape3D)
>          {
>           Shape3D shape = (Shape3D)obj;
>           shape.setCabapilities ( Shape3D.ALLOW...);
>           ...
>          }
>      }
>
> (...)
> /* add loaded object to scene graph*/
> objRoot.addChild(scene);
>
>
>
> This is just a ideia. I am not sure if it will fix you problem.
>
> Alessandro
>
> nagehan pala escreveu:
>
> > Hi all
> >
> > My program loads two .obj files and they are added to a live scene
> > graph(Scene.getSceneGroup()) . They are pickable and they can be moved by
> > the user. And i want to draw a line between them during runtime. But a
> > runtime error given:
> >
> >
> > javax.media.j3d.CapabilityNotSetException: Shape3D: no capability to get
> > geometry
> >
> > Before I tried it with ColorCubes and set this capability:
> > PickTool.setCapabilities(node, PickTool.INTERSECT_FULL)
> >
> > And it was run. But I can't set this capability for loaded files, because
> > node can only be Shape3D, Morph or Geometry nodes.
> >
> > i need help, please...
> >
> > Nagehan Pala
> >
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