Re: [Flightgear-devel] New texture draw method

[Erik H. <er...@eh...>]

> >
> > I'd be happy with a pat answer. "Homnna homna homna" doesn't cut it when
> > somebody asks. As trivial as it might seem to us, its a big honkin' issue
> > in a pink tutu stoking a di'napoli and guzzling cheap gin to somebody off
> > the street
> 
> The problem is that if two verticies that area supposed to be
> coincident go through two *different* transformations they don't
> always end up exactly the same place.  It wouldn't be a problem with
> infinite precision math, but we are stuck doing this with floats
> because that is what opengl uses interenally.  Given the lack of
> precision floats, by the time you transform the two points to screen
> space, one could get rounded up, the other down and then you could see
> a pixel wide gap flicker between the two objects.

So trying to hide the effect is by far the best solution for this.

Erik