Re: greyed-out planes

• To: Vijay Chemburkar <vijay@xxxxxxxxx>
• Subject: Re: greyed-out planes
• From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>
• Date: Wed, 29 Aug 2001 01:00:51 -0500

Hi Vijay,

> I continue my over-use of this list...

Not at all.

> So my current bug deals with planes in a 3d display. I'm putting in
> planes by creating a linear2dset, a flatfield with my values in it and a
> FunctionType to tie two of the axes in my DisplayImplJ3D to a ScalarMap
> (a color map). So the plane gets added and displayed, and it works fine.
> The problem occurs when I try adding any more of these planes. Sometimes
> (say, 95 percent of the time) the first plane will become greyed out.
> The 5 percent of the time the plane doesn't become greyed out, if I try
> to move the display, the vm crashes:
> 
> # # An unexpected exception has been detected in native code outside the
> VM.# Program counter=0x404ada90
> #
> # Problematic Thread: prio=5 tid=0x81b52e0 nid=0x39f runnable
> #
> 
> Any ideas? thanks

I assume your planes are semi-transparent. There are problems
with transparency, so that the planes must be sorted in the
correct depth order. You can control order by putting each
plane (i.e., FlatField) in its own addReference() to the
display. The planes will be rendered in the same order as
their addReference() calls, so you can experiment with order.
The problem is that if you rotate 180 degress, then the order
needs to be reversed. A future release of Java3D will do the
sort for us automatically.

I have seen the same native code exception (rarely) and assume
it is a bug in Java or OpenGL.

Cheers,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI  53706
hibbard@xxxxxxxxxxxxxxxxx  608-263-4427  fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html

• Follow-Ups:
  • Re: greyed-out planes
    • From: Doug Lindholm

• References:
  • greyed-out planes
    • From: Vijay Chemburkar