Thanks, I would have never found that out myself!
I added a scale-transformation that scales the entire scene by a factor
0.001 and all the trouble is gone!
----- Original Message -----
From: Roberto Speranza <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: donderdag, november 04, 1999 9:00
Subject: Re: [JAVA3D] Strange waves in my cubes
> Sorry. I didn't notice some of the larger problems. Now that you mention
> the distances you used, I think the problem is related to Z-buffer
> resolution. OpenGL uses an integer Z-buffer and coordinate depths are
> converted to integer values for writing into the Z-buffer. The farther
> apart the geometry, the less resolution your Z-buffer has. The side
effects
> of using too large a space are much like what you are seeing: seaming
> triangles, missing surfaces, cracked edges.
>
> I believe the Java3D spec probably has guidelines for geometry size with
> respect to the Z-buffer. I know OpenGL does but I don't have my reference
> book here with me to provide it to you.
>
> Roberto Speranza
> President, Dot Internet Solutions Inc.
> mailto:[EMAIL PROTECTED]
> http://www.dotinc.net/
> ----- Original Message -----
> From: Patrick van Bergen <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: November 4, 1999 12:55 PM
> Subject: Re: [JAVA3D] Strange waves in my cubes
>
>
> > They problem here may be a that some triangles are culled. But it is
> > different. For one thing, I didn't use triangles to build these cubes; I
> > used quads. Also, the problem affects the entire cube, not only the
edges.
> >
> > Somehow the effect is much smaller when the distance between the viewer
> and
> > the cube is smaller. I am using distances to several thousands of units
> > (meters).
> >
> > When I add 2D text shapes in front of these cubes, it also looks very
> messy,
> > some parts being visible, others not.
> >
> > Patrick
> >
> > ----- Original Message -----
> > From: Matthew Warren <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: donderdag, november 04, 1999 3:12
> > Subject: Re: [JAVA3D] Strange waves in my cubes
> >
> >
> > > I have seen a similar effect when displaying rows of sphere primitives
> > that
> > > overlap, I wasnt sure why and didnt consider it a problem - I assumed
it
> > was
> > > to do with the number of triangles making the spheres. IE: triangles
> that
> > > partially covered each other when spheres overlapped where removed
> rather
> > > than clipped to the right shape?
> > >
> > > I assume from reading below this is the culling problem?
> > >
> > > Is it possible to get J3D to clip intersecting tringles when shape3D's
> > > intersect so they render with 'flush' edges rather than just removing
> the
> > > triangle?
> > >
> > > Matthew.
> > >
> > >
> > > >This appears to be a culling problem. The only triangles that are
> > > >disappearing are those at the edges of your rounded cubes. My best
> guess
> > > >is
> > > >that the rounded edges of the cubes are not tesselated enough i.e.
not
> > > >enough triangles were used to define the rounded sections. Because
> there
> > > >aren't enough triangles, some of the triangles have normals that are
> not
> > > >quite correct and they are being culled. As you rotate the view,
> > naturally
> > > >different triangles would be affected. To fix the problem, you need
to
> > > >create the cubes with more triangles in the rounded regions.
> Hopefully,
> > > >your code can be adjusted to do that.
> > > >
> > > >Roberto Speranza
> > > >President, Dot Internet Solutions Inc.
> > > >mailto:[EMAIL PROTECTED]
> > > >http://www.dotinc.net/
> > > >----- Original Message -----
> > > >From: Patrick van Bergen <[EMAIL PROTECTED]>
> > > >To: <[EMAIL PROTECTED]>
> > > >Sent: November 4, 1999 7:21 AM
> > > >Subject: [JAVA3D] Strange waves in my cubes
> > > >
> > > >
> > > > > Hai there,
> > > > >
> > > > > I am building an application that contains a number of rounded
> cubes.
> > > >When
> > > > > these cubes overlap eachother I get these strange 'waving'
effects,
> > that
> > > >can
> > > > > best be explained by looking at the attached picture. I say waving
> > > >because
> > > > > triangular waves go through the sides of the cube when I zoom in
and
> > out
> > > >of
> > > > > the objects.
> > > > >
> > > > > I tried changing some of the renderingattributes of the appearance
> > > >without
> > > > > much effect.
> > > > >
> > > > > Has anyone seen such an effect before? I am not doing anything
> special
> > > >here.
> > > > >
> > > >
> > >
> >
>
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