Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!uunet!mcsun!ukc!newcastle.ac.uk!turing!q1rse
From: D.M.Johnson@newcastle.ac.uk (Dave Johnson)
Newsgroups: comp.sys.atari.st.tech
Subject: Vsync, sprites, Aline
Keywords: aline,sprites,vsync
Message-ID: <1991May23.120342.3876@newcastle.ac.uk>
Date: 23 May 91 12:03:42 GMT
Sender: news@newcastle.ac.uk
Organization: University of Newcastle upon Tyne, UK, NE1 7RU
Lines: 24


I was messing around with the aline routines in the 'COMPUTE! volume 3 - DOS'
and can across this problem:

I was ploting sprite to the screen (using either the Blitbit or Sprite routine,
I can not a present remember which) in assembler. I was waiting until the
VVsync to prevent flicker: no problem here. the sprite moved around the screen.
flickering slightly (this was do with the code - I fixed it so there was no
flicker) but when the sprite moved around the screen. There was a region in
which the sprite disappeared as it moved through it, (it got worse when I
removed the wait for the Vsync).

Could anyone explain what is happening and if so whats the cause and the cure.

Machine used

2.5meg STFM
mono Monitor
1.2 OS

Dave

P.S. If the above does make sense I will try and dig up the program and post it
so some one could help me.