Tearing and v-sync

[lionfish]

I've noticed that the video in the 3d environment has severe tearing (this is caused by the graphics driver drawing images to the LCD that have not yet finished rendering).
The obvious solution is to enable vsync, which I tried with various combinations of the viz.vsync(viz.ON) command, settings in the nvidia control panel and with a utility called RivaTuner. The result was that the tearing just appeared near the top of the screen, and the video occasionally 'jerked' or 'jittered' - as if several refreshes are skipped.

This is being run on an ASUS Dell 64-bit laptop, running windows 7. The graphics card is an nVIDIA GeForce GTX 260M. I've checked the graphics drivers are up to date, and have just upgraded vizard to the latest version (v3.15).

I've also tried forcing triple buffering using RivaTuner, and have tried tweaking a lot of random options.

I was wondering if there's a way in vizard to reduce the frame rate, without v-sync it's nearly at 200fps. I was thinking if I could reduce that to 50fps, then the tearing might stop. (and won't have added 'jittering' either)

Thanks for any ideas,

Mike Smith
University of Edinburgh.