> From: Dean Keeler <[EMAIL PROTECTED]>
>
> I have an application that loads in a VRML file. Whenever I manipulate the
> model by rotating it, zooming in on it, etc, the model starts hiding and
> showing different VRML nodes. Some nodes that should show behind other nodes
> that are in the foreground are showing in front. How can I keep this from
> happening? Can someone please give me some suggestions?
I'm assuming that you have depth buffering turned on (it is by default). In
that case, a common cause of this problem is setting the front clip plane too
close to the eye. If the ratio
back clip distance / front clip distance
is greater than 1000 or so, you see problems like you describe, especially in
the back of the view volume. Setting front clip dist = 0.00000001, back clip
dist = 1000000.0 is effectively the same as turning off depth buffering.
You can get away with higher ratios (3000-10000) if your hardware has a lot of
z-buffer resolution or if the objects that are in the back of the view volume
have a lot of spacial separation.
Try setting your clip planes like this:
view.setFrontClipPolicy(View.VIRTUAL_EYE);
view.setBackClipPolicy(View.VIRTUAL_EYE);
double frontDist = 0.1; // <-- set this to what you need
view.setFrontClipDistance(frontDist);
view.setBackClipDistance(frontDist * 1000.0);
Adjust frontDist to make your picture look right.
Doug Gehringer
Sun Microsystems
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