Geesh, this is actually a _serious_ bug in Morphic (which I never run across
for some reason). I just posted a fix, and test for it.

Cheers,
  - Andreas

> -----Original Message-----
> From: squeak-dev-bounces at lists.squeakfoundation.org 
> [mailto:squeak-dev-bounces at lists.squeakfoundation.org] On 
> Behalf Of Bob Arning
> Sent: Sunday, August 03, 2003 11:34 PM
> To: MartinKuball at web.de; squeak-dev at lists.squeakfoundation.org
> Subject: Re: B3dSceneExplorerMorph not really deleted
> 
> 
> On Sun, 3 Aug 2003 22:13:59 +0200 Martin Kuball 
> <MartinKuball at web.de> wrote:
> >Am Sonntag, 3. August 2003 19:05 schrieben Sie:
> >> On Sun, 3 Aug 2003 15:53:15 +0200 Martin Kuball 
> <MartinKuball at web.de> wrote:
> >> >I tried the following in a 3.5 image on Linux:
> >> >	B3DSceneExplorerMorph new openInWorld
> >> >After playing with it I deleted the morph using the x in 
> it's halo. Than I
> >> >went to the trash and told it to erase it's content. Now 
> every time I
> >> > switch to squeak from another window I see a black box 
> of the size and at
> >> > the position of the B3DSceneExplorerMorph. How do I get 
> ridd of it?
> >>
> >> Did you turn on hardware acceleration? If so, the simplest 
> fix may be to
> >> reboot your computer, or at least quit squeak and start it again.
> >
> >Restarting squeak worked. What exactly is the reason for this?
> 
> The black square is the OpenGL hardware/software still 
> maintaining control over that part of the window. If you were 
> to delete the actual B3DSceneMorph (the part inside the gray 
> border of the B3DSceneExplorerMorph), then 
> B3DSceneMorph>>outOfWorld: would see to it that the OpenGL 
> renderer knew to cease and desist. Since deleting the 
> B3DSceneExplorerMorph doesn't trigger this code, OpenGl 
> thinks it's still in business. What I have been using for 
> quite a while is
> 
> B3DSceneExplorerMorph>>delete
> 
> 	b3DSceneMorph ifNotNil: [b3DSceneMorph suspendAcceleration].
> 	super delete.
> 
> Cheers,
> Bob
>