Hi Roy,
Looked at your code. Removed the OrderedGroup doing this:
// ordGroup.addChild(textRoot);
// objRoot.addChild(ordGroup);
objRoot.addChild(textRoot);
The effect now appears to be correct. This probably has something to
do with the way the depth buffer is set in either the View or Text2D
APIs...
Vaidya
>On Thu, 24 Oct 2002 08:37:16 -0400, Roy Duffy <[EMAIL PROTECTED]> wrote:
>This makes sense, but I don't think my problem has anything to do with how the
>geometry is sorted. My problem is that the text is not fully transparent when under
>the OrderedGroup. It sometimes occludes the text behind it as you can see in the
>example I posted in the other email. I would think even if it was sorted incorrectly,
>you would still be able to see parts of each text because they're supposed to be
>transparent. And I think that's what Andreas was saying he also saw in his
>application.
>
> -Roy
>
>"Raj N. Vaidya" wrote:
>
>> Ok ! Here is what I know about rendering transparent geometries...
>> If this probably confuses rather than clarifies the issues, y'all
>> be my guests and make the corrections...
>>
>> Opaque/transparent geometries under an OrderedGroup are rendered
>> before transparent geometries not under an OrderedGroup. So, setting
>> the view capab. bit for transparency sorting should have no effect on
>> geometries under an OrderedGroup. Also, an OrderedGroup simply
>> guarantees that the geometries under it will be rendered in their
>> index order. It doesn't really do anything, nor it claims to,
>> about back-to-front (BTF) sorting its transparent children.
>> Thus, a BTF ordering that may be correct in one view-geometry-relative
>> orientation may not be BTF correct when the orientation changes.
>> It's the responsibility of the user to rearrange the ordering
>> in such cases to prevent artifacts.
>>
>> Without an OrderedGroup, transparent geometries can be BTF sorted
>> possibly correctly based on the view sorting policy. However, this
>> sorting is not per-polygon but ( I guess ) is probably per-geometry
>> bounds. In essence, this sorting may also produce artifacts
>> if the transparent geometries cannot be "cleanly" BTF sorted as
>> would be the case if the geometries are self-intersecting or
>> if their bounds are overlapping.
>>
>> Regards
>>
>> Vaidya
>>
>> >On Wed, 23 Oct 2002 10:34:48 -0400, Roy Duffy <[EMAIL PROTECTED]> wrote:
>>
>> >Hi.
>> >I think I may have seen this problem too. I made a test case but I was debating
>> >whether I should post it, but now I can't resist since it seems like the same
>> >problem.
>> >It's two Text2D objects under an OrderedGroup. If you drag the mouse to spin the
>> >one labeled "FAR" in front of the one labeled "NEAR", it occludes it. But if I
>> >remove the OrderedGroup, then it works fine. I have depth-sorted transparency
>> >enabled but it didn't help.
>> >
>> > -Roy
>> >
>> >
>> >Andreas Jerke wrote:
>> >
>> >> > Andreas Jerke wrote:
>> >> >
>> >> > > When I change the Scenegraph (Moving objects, changing Switch etc.) the
>> >> > > transparency does not work anymore. Some objects BEHIND other transparent
>> >> > > objects are shown, others NOT.
>> >> >
>> >> >
>> >> > Have you set
>> >> > View.setTransparencySortingPolicy(TRANSPARENCY_SORT_GEOMETRY) ?
>> >>
>> >> I tried it, but with the same effect. I'm thinking of writing
>> >> a simple testcase to reproduce this, but before that I will test my app
>> >> on a different sys.
>> >
>>
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