[JAVA3D] PickSegment woes with 1.2 beta1 (WinNT)

[Rob Nugent]

Hi,

I've just downloaded Java3D 1.2 beta on WinNT and I am still experiencing
substantial problems with picking using PickSegment and PickRay. I've
had this open as a bug at JavaSoft for some time, but nobody has yet looked
at it.

I'm still not convinced that I am not making some user error. I wonder
if anyone in the know would be prepared to take a quick look at the
attached v.simple test case, and say whether it should
work or not.

The test case tries to pick a cube centred at the origin using a couple
of PickSegments and a PickRay.

The testcase generates different results under Java3D 1.1.2 and 1.2 beta.
(The PickRay case worked under 1.1.2)

The Bug Parade defect is:

http://developer.java.sun.com/developer/bugParade/bugs/4275899.html

It's been accepted as valid, but I'd really appreciate some comments.

I am at the point where I have given up trying to take my Java3D app
any further, since I can't reliably use PickSegments and PickRays to
test for interaction between my objects.

Thanks
Rob

----snip----
import javax.media.j3d.*;

import javax.vecmath.*;

public class PSTest
{
    public static void main(String[] args)
    {
 VirtualUniverse u = new VirtualUniverse();
 Locale l = new Locale(u);
 BranchGroup bg = new BranchGroup();
 CubeShape cs = new CubeShape();  // Cube centred about origin
 bg.addChild(cs);
 System.out.println("bg pickable" + bg.getPickable());
 System.out.println("cs pickable" + cs.getPickable());
 l.addBranchGraph(bg);


 //
 // Show that a PickSegment along the zaxis fails
 // (end point inside Shape3D's bounds)
 //
 PickSegment ps1 = new PickSegment(
   new Point3d(0.0,0.0,   0.0),
   new Point3d(0.0,0.0,+100.0));

 System.out.println("Pick using segment 1 (Should return CubeShape) :"
         + l.pickAny(ps1));

 //
 // Show that a PickSegment along the zaxis fails
 // (end point outside Shape3D's bounds)
 //
 PickSegment ps2 = new PickSegment(
   new Point3d(0.0,0.0,-0.5),
   new Point3d(0.0,0.0,+1.5));

 System.out.println("Pick using segment 2 (Should return CubeShape) :"
         + l.pickAny(ps2));

 //
 // Show that a PickRay along the z axis fails
 //
 PickRay pr = new PickRay(
   new Point3d(0.0,0.0,-100.0),
   new Vector3d(0.0,0.0,1.0) );

 System.out.println("Pick using ray 1 (Should return CubeShape) :"
         + l.pickAny(pr));

    }
}
----snip----

The CubeShape class is as follows:


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

public class CubeShape extends Shape3D
{
    private QuadArray  cubeQA;

    private static float[] verts =
    {
 // front face
         1.0f, -1.0f,  1.0f,
         1.0f,  1.0f,  1.0f,
        -1.0f,  1.0f,  1.0f,
        -1.0f, -1.0f,  1.0f,
 // back face
        -1.0f, -1.0f, -1.0f,
        -1.0f,  1.0f, -1.0f,
         1.0f,  1.0f, -1.0f,
         1.0f, -1.0f, -1.0f,
 // right face
         1.0f, -1.0f, -1.0f,
         1.0f,  1.0f, -1.0f,
         1.0f,  1.0f,  1.0f,
         1.0f, -1.0f,  1.0f,
 // left face
        -1.0f, -1.0f,  1.0f,
        -1.0f,  1.0f,  1.0f,
        -1.0f,  1.0f, -1.0f,
        -1.0f, -1.0f, -1.0f,
 // top face
         1.0f,  1.0f,  1.0f,
         1.0f,  1.0f, -1.0f,
        -1.0f,  1.0f, -1.0f,
        -1.0f,  1.0f,  1.0f,
 // bottom face
        -1.0f, -1.0f,  1.0f,
        -1.0f, -1.0f, -1.0f,
         1.0f, -1.0f, -1.0f,
         1.0f, -1.0f,  1.0f,
    };

    public CubeShape()
    {
        cubeQA = new QuadArray( 24,
    QuadArray.COORDINATES );

        cubeQA.setCoordinates(0, verts);

 setGeometry(cubeQA);

 setPickable(true);

 cubeQA.setCapability(QuadArray.ALLOW_COUNT_READ);
 cubeQA.setCapability(QuadArray.ALLOW_COORDINATE_READ);
    }
}
----snip----

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