Search on the net for Decals. Basicly, you put the blood texture over the floor texture, and turn off Z-testing, so it can be drawn on the same plane as the floor.

HTH

Steve
DirectX Programmer
Soon to be the new Bill Gates

If you''re using a single quad for the floor, than your best bet is to have your special bits (blood stains, etc) as textures with alpha so they blend over the floor.

Alternately if you want to use a tile approach, make each tile it''s own quad, and then if your room is 2 tiles by 2 tiles, and a ''.'' represents a normal floor and a ''_'' is a bloody tile you do it so you have 4 quads laid out like so:
._
..

Which gives you a bloody tile in the top right corner of the room.


Stay Casual,

Ken
Drunken Hyena