Thank you very much everybody!
When I studied Z-Buffer algorithm at university, I did'nt realize how
important is.
A note: I have only worked with VRML before work with Java3D, so I don't
know nothing about OpenGL.
Is OpenGL knowledge import for understanding ZBuffer at Java3D?
Only a last question, How can I get the focal point on the terrain??
Maybe making a pick? This is a very cost processing.
-----Mensaje original-----
De: Renoir Sewjee <[EMAIL PROTECTED]>
Para: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
Fecha: miércoles 23 de mayo de 2001 14:37
Asunto: Re: [JAVA3D] ZBUFFER PROBLEM
>Hi,
>
>I adjust the back clip distance and make the front clip distance a ratio of
the
>back clip distance:
>
> view.setBackClipDistance(radius*2.0f);
> view.setFrontClipDistance(radius*2.0f/5000.0f);
>
>radius is the distance from the camera position to the focal point (the
point
>the camera is looking at).
>
>--Renoir
>
>John Wright wrote:
>
>> Alvaro,
>>
>> None of us have "solved" the z-buffer problems. The best we can do is
>> make intelligent choices for front and back clipping distances to best
>> fit our scene. Dynamically adjusting the front and back clipping values
>> is an intriguing idea, but it would be pointless to adjust just one of
>> them.
>>
>> - John Wright
>> Starfire Research
>>
>> alvaro zabala wrote:
>> >
>> > Hi all!,
>> > I have a question about changing clipping planes dinamically for solve
the
>> > z-buffer tearing problem.
>> >
>> > Desiree and Chris suggest me to changing front clip distance, but I
don't
>> > understand very well.
>> >
>> > Don't I may change the back clipping plane instead?
>> >
>> > My idea is to calculate the distance from the Viewing Platform to the
>> > furtest object , and change the back clipping plane to that distance.
>> >
>> > May I have in a blunder??
>> >
>> > Please, see the atachment with the z-Buffer problem.
>> >
>> > (People who has solved it, like David Yazel would be appreciated)
>> >
>> > -----Mensaje original-----
>> > De: ChrisThorne <[EMAIL PROTECTED]>
>> > Para: [EMAIL PROTECTED] <[EMAIL PROTECTED]>
>> > Fecha: miércoles 23 de mayo de 2001 1:18
>> > Asunto: Re: [JAVA3D] Test program (fwd) for Grafic card question
>> >
>> > >
>> > >
>> > >Desiree Hilbring wrote:
>> > >
>> > >> > Sounds like you need to set the back clipping distance further.
>> > >>
>> > >> I detected that dist sometimes calculates a negative distance,
setting
>> > the
>> > >> front clipping plane at a minimum of 1 solves the clipping problem,
but
>> > >> the original zbuffer issues still exists.
>> > >
>> > >Ok, there was a mistake - I should have used absolute values. You
could
>> > using the sqrt distance
>> > >formula - as in the attached version of your test program.
>> > >
>> > >It works on my tests using your test program and dist will always be
+ve.
>> > >
>> > >If that doesn't work in your main application then we can try keeping
the
>> > forward/back clip ratio
>> > >to a constant. I see from your later mail you have used this
solution.
>> > Are you keeping the
>> > >ratio to 3000 or a smaller number?
>> > >
>> > >cheers,
>> > >
>> > >Chris
>> > >
>> > >
>> > >--
>> > > ,--_|\
>> > > / Oz \
>> > >Chris Thorne :)_.--._/
>> > >[EMAIL PROTECTED] v
>> > >
>> > >
>> >
>>
------------------------------------------------------------------------
>> > Name: Prueba1.gif
>> > Prueba1.gif Type: GIF Image (image/gif)
>> > Encoding: base64
>>
>>
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>
>--
>Renoir Sewjee
>Software Engineer
>ISS International (Welkom)
>Tel: +27 (0)57 912 2702
>Fax: +27 (0)57 912 2652
>--
>
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