I''m using D3D to draw a scene, and i''m getting that split picture effect, and i think it''s because its drawing a new frame while the monitor is still outputting. how do you tell D3D to wait for a vertical blank? thanks for your help, i''m just too used to 2D.

I think you specify that when setting up your presentation parameters :

D3DPRESENT_PARAMETERS parms;
parms.FullScreen_PresentationInterval = D3DPRESENT_INTERVAL_ONE;

like this.