   Marquee text in directx Lpd3dxfont
  I am marqueeing a text (text is written by LPD3DXFONT) at 24 fps.Although i use 3 backbuffer clear all of them in every frame after render process is completer,my text is a little blinking.In essence, it is not blinking but i get a feeling that i  see the text is in old location when i see it in new location.Text is moving 8 pixel by frame (velocity) and then rendered.if i decrease the velocity there is no problem.But when i increase it my eyes catches the oldframe.I stopped the frame and saw that i am only making one render(text is not written in old location and new location.I ensure that it is only written in new location).Is there a way to eradicate this problem.Is there a way to trick my eyes.Because this is really taking smoothness from the text.How can i get smooth moving text at 24 fps (i want to move it at least 8 pixel on each frame too.that makes 24*8 pixel in a second).Is there a technique for that marquee   
  You might be animating at 24fps, but are you rendering at a higher speed?What you've described sounds a bit like "tearing" - common when the refresh rate is a multiple of (or out of sync with) the monitors vertical refresh rate.Try modifying your application D3DPRESENT_PARAMETERS::PresentationInterval value to either D3DPRESENT_INTERVAL_DEFAULT or D3DPRESENT_INTERVAL_ONE. If that doesn't do anything, make sure that your graphics card drivers aren't overriding the applications preference.hthJack   