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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>
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