help: flickering animations

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i'm trying to do some 3D and stuff which is going great except for a
few things (i'm going to break this up into 2 messages because they
deal with different things)...  anyway about my flickering

it seems to me that i'm already starting to erase what i've just
drawn when the screen refreshes, so i'm left sometimes with half a
cube on screen, sometimes with the whole cube, sometimes with no cube
at all...

what i'm wondering is...how can wait until the screen refreshes
before i start erasing??  do i have to know the refresh rate of the
screen and then use a timer??  if so how do i figure out the refresh
rate (i'm designing this so i can be used in any screen mode)



 .   o   O  Mike Burrell  O   o   .
.  o O burrellm at geocities.com O o  .
  .  o  O mikpos.base.org O  o  .

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