RE: FW: [gl4java-usergroup] animation stutters

[Peter <kaf...@xt...>]

> On Wednesday 30 October 2002 20:08, Peter wrote:
> > > > One definite difference between my code and JCanyon is that I'm
not
> > > > using the NIO direct buffers, though OTOH I'm using display
lists,
> >
> > so
> >
> > > > that shouldn't matter beyond the initial access.
> > >
> > > no, that is not correct. Java can move your vertex/normal/whatever
> >
> > arrays
> >
> > > around underneath you before your get the chance to call
> >
> > glArrayElement
> >
> > > (or
> > > similar).
> >
> > As I said in my post, I'm using *Display Lists*.  It doesn't matter
what
> > happens to the arrays after the lists are made (altering the arrays
has
> > no effect on the data stored in the list whatsoever)
> >
> 
> Your arrays can be moved around *before* you create the display list,
and
> after you specify the array. To create a display list your would do
> something
> like this:
> 
> float[] vertex_array;
> int[] indices;
> 
> ...
> 
> glVertexPointer(..., vertex_array);
> 
> ...  <- It it here, between the array call, and the draw call that
your
> vertex
> data arrays can move around.
> 
> glDrawElements(...., indices);
> 
> And yes, that gap between glVertexPointer and glDrawElements is
normally
> very
> small, but believe me, it can happen.
> 

Oh, ok - I see your point.  Sorry - I misunderstood what you were
getting at. ;-)

Thanks for the feedback.

Peter.