   dcaling help please...
  i want a help in dcaling with DirectX..i work on an Engine for racing game which the cars are wandering on terrain.and so i want to draw the wheel's trace on the ground...how can i do this?..i want to ask too if i can use the decaling to render the Path Section by this techniqe(decaling).Thx..DoomAngle.   
  If I can understand it correctly, you want to create tire tracks.For each wheel->draw a quad aligned with the terrain, using the intersecting point of the wheel and terrain as its centre, and possibly rotating the texure to the appropiate direction.*You might want to treat this a particle system, where the decals disapates slowly over time.   