In your code, you should do the cast AFTER you verified the class type :
that is, instead of :
Cone conex=(Cone)geom;
if (conex instanceof Cone) {
Cone conex=(Cone)someCone;
...
you should:
if (geom instanceof Cone) {
Cone conex=(Cone)geom;
...
This is not going to take a crap on you, but then, it is never going to work
either, just because Cone
is derived from Primitive, NOT from Geometry. A Cone, however, is build from
Shape3Ds,
which in turn are built from Geometries.
A single look at the JavaDoc of Cone would have revealed to you what was
wrong with your cast!
Therefore I strongly recommend, that you, on occasion, read some JavaDoc
first!!!!
H.
----- Original Message -----
From: "Brobbey,Isaac (neuron)" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, January 31, 2003 9:39 AM
Subject: [JAVA3D] cone retrieval / Important
> hi all:
>
> given the code below:
>
> sceneGraphPath = branchGroup.pickAny(pickRay);
> System.out.println("scene graph="+"
> "+sceneGraphPath.toString());
> Shape3D shape3d = (Shape3D)sceneGraphPath.getObject();
> Geometry geom = shape3d.getGeometry();
> Cone conex=(Cone)geom;
> if( conex instanceof Cone)
> {
> Cone conex=(Cone)someCone;
> float Ht=conex.getHeight();
> System.out.println("cone height="+" "+Ht);
> }
>
> i have a problem on line " Cone conex=(Cone)geom; "
>
> what is the best way to get a cone from the scenegraph path ?
> this is the path;
>
> scene graph= javax.media.j3d.Locale@dfcb47 :
> com.sun.j3d.utils.geometry.Cone, Protein@9abc69 :
> javax.media.j3d.Shape3Djavax.media.j3d.TriangleFanArray@c792d4
>
> LocalToVworld Transform:
> 0.0375749076740305, -0.005965948985267853, -0.012350453208999744,
> 0.020183997378
> 483642
>
> thanks,
>
>
>
> Isaac
>
>
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