decals

In my 3D fps shooter, I have a pretty basic system for blood. It just spawns a flat sprite on the ground, and to keep the game from slowing down, I have an instance check that sees if there are more than X amount of blood decals, and if there are, then it deletes the first ones created. This...

Can anyone tell me if it is possible to do decals on 3D models. For example, I am using d3d_draw_block() to create some blocks - I am wanting to leave marks on them when bullets hit, or other stuff (blood splatter, other decorations, etc...). Some would be permanent (like decorations) others...