I don't think Lee is having a good day, we keep misunderstanding his
scenarios, and then we suggest things he has already tried. :(
> ----------
> From: J. Lee Dixon[SMTP:[EMAIL PROTECTED]]
> Reply To: Discussion list for Java 3D API
> Sent: Tuesday, September 19, 2000 2:50 PM
> To: [EMAIL PROTECTED]
> Subject: Re: [JAVA3D] Billboard using Z-axis
>
> I have my "avatar" roaming the x-y plane, z being up. When I set the
> alignment axis to *nearly" the z-axis, this axis goes through all the
> transforms to get it into eye coordinates... which is almost the y-axis
> in eye coordinates. I don't believe the alignment axis is relative to
> the eye-coordinates or this wouldn't work. I think the alignment axis
> goes through all the transforms just like everything else in the scene.
>
> For example, in *WORLD* coordinates my eye is looking along the +Y axis,
> and my object is being rotated about the +Z axis. In *EYE* coordinates
> it would appear as though the object is rotating about the +Y axis.
> Instead, it just disappears. If I set it to rotate to *nearly* the +Z
> axis in world coords, it works. Why is this?
>
> -Lee
>
> -----Original Message-----
> From: Doug Gehringer [mailto:[EMAIL PROTECTED]]
> Sent: Tuesday, September 19, 2000 2:03 PM
> To: [EMAIL PROTECTED]
> Subject: Re: [JAVA3D] Billboard using Z-axis
>
>
> > I'm playing with using BillBoard... whenever I set the
> >
> > bb.setAlignmentAxis(0f, 0f, 1f )
> >
> > to select the Z-axis, the object DISAPPEARS.
>
> The alignment axis is relative to the eye. The eye looks along the
> Z-axis, so
> that if you align to that the Billboard is always edge-on, which is why
> it
> disappears.
>
> Doug Gehringer
> Sun Microsystems
>
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