2D Sprite In A 3d World?

[slashandburn]

How can I Put like in old 3d games like Doom,Duke3d have
2d sprites in a 3d world?

[Sam Finch]

IO'm not too hot with direct X so I dont know exactly but you have to make an invisible cuboid where the object is and paste the sprite onto it, then make sure it's always facing the right way.