Lee:
This bug is fixed in the FCS release.
-Uma
> MIME-Version: 1.0
> Date: Thu, 22 Feb 2001 16:02:45 -0500
> From: "J. Lee Dixon" <[EMAIL PROTECTED]>
> Subject: Re: [JAVA3D] LocalToVworld transform and deriving from Node
> To: [EMAIL PROTECTED]
>
> I had already tried using an empty Shape3D. I got the following
> exception. Doesn't work for me. It doesn't make sense that Shape3D
> should die like this... I think it's a bug.
>
> Invocation Target Exception null
> java.lang.reflect.InvocationTargetException:
> java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
> at java.util.ArrayList.RangeCheck(ArrayList.java:491)
> at java.util.ArrayList.get(ArrayList.java:307)
> at
> javax.media.j3d.Shape3DRetained.shapeIsMergeable(Shape3DRetained.java:17
> 45)
> at
> javax.media.j3d.Shape3DRetained.merge(Shape3DRetained.java:1715)
> at javax.media.j3d.GroupRetained.merge(GroupRetained.java:1788)
> at
> javax.media.j3d.TransformGroupRetained.compile(TransformGroupRetained.ja
> va:308)
> at
> javax.media.j3d.GroupRetained.compile(GroupRetained.java:1761)
> at
> javax.media.j3d.TransformGroupRetained.compile(TransformGroupRetained.ja
> va:285)
> at
> javax.media.j3d.GroupRetained.compile(GroupRetained.java:1761)
> at
> javax.media.j3d.BranchGroupRetained.compile(BranchGroupRetained.java:146
> )
> at
> javax.media.j3d.BranchGroupRetained.compile(BranchGroupRetained.java:121
> )
> at javax.media.j3d.BranchGroup.compile(BranchGroup.java:82)
>
> -Lee
>
> -----Original Message-----
> From: David Schachter [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, February 22, 2001 3:33 PM
> To: [EMAIL PROTECTED]
> Subject: Re: [JAVA3D] LocalToVworld transform and deriving from Node
>
>
> Use a Shape3D with no geometry or appearance (that is, use the default
> constructor for Shape3D, not a constructor that takes parameters--or, if
> you've over forty, arguments.) Without geometry and appearance, there's
> nothing to render.
>
>
> I had a similar problem over the weekend and the above is how I solved
> it.
>
>
> It's handy to have a debug switch that replaces the empty Shape3D with a
> ColorCube or other visible object, to serve as a proxy for the invisible
> object. The proxy makes 3D placement problems easier to find and fix.
> It's also handy to have a a continuous intravenous drip of dark Belgian
> chocolate, but that's a different topic.
>
>
> BTW, the Java3D API specification mentions a flag for rendering
> "invisible" objects but there's no useful description of what that
> means. What's the spec talking about, in section C.5.5, "Visibility
> Policy," page 518 of The Java 3D(tm) API Specification, Second Edition,
> by Sowizral, Rushforth, and Deering?
>
>
> -- David Schachter
>
>
> At 02:33 PM 2/22/2001 -0500, J. Lee Dixon wrote:
> >I am trying to implement animated cameras, but I am having a little
> >trouble. First, a camera really has no shape, so I implement the camera
>
> >as a TransformGroup. In order to make the call to getLocalToVworld(),
> >the node in question must be live. Well, if I don't put a shape
> >underneath the TransformGroup, then it never becomes live. Sounds like
> >good optimization, but I need to know the transform for this "undrawn"
> >entity.
> >
> >I could put a Shape3D with a single point and then give it rendering
> >attributes to make it hidden, but that seems kludgy (BTW, this IS the
> >correct spelling according to dictionary.com). ;)
> >
> >I even tried to make my own "EmptyNode", derived from the base class
> >"Node". But when I tried to addChild(), I got:
> >
> >java.lang.reflect.InvocationTargetException:
> >java.lang.NullPointerException
> > at
> >javax.media.j3d.GroupRetained.checkValidChild(GroupRetained.java:393)
> > at
> >javax.media.j3d.GroupRetained.addChild(GroupRetained.java:406)
> > at javax.media.j3d.Group.addChild(Group.java:261)
> > ... yadda yadda
> >
> >Any suggestions??
> >
> >J. Lee Dixon
> >SAIC - Celebration, FL
> >407-566-1438
> >[EMAIL PROTECTED] AOL: LeeOrlando
> >
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>
>
>
>
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