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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