modify .mat files and blood stain help

[tonitoni1998]

hey guys im working on my first costum map "Corridors" but im abeginner and i have problems by putting blood on the floor where the player starts. there is only "blood_pool_01.mat" with only one stain on the texture. and these would look all the same.

so how can i pick up only once of the stains from "blood_smear_01.mat" or others without modifying the .mat file or how do i modify the .mat files (which program)

thanks alot.

(by the way, do you know how to introdruce into the game like in "Justine" or "The Dark Descent"? with bured view and all that stuff...)