How do I add a screen blood splatter effect?

[Trueform]

Hi,

I would really love to add an effect onto a mod of mine that displays a blood splatter across the screen, much like the one you get on Mothership Zeta when you first arrive on the ship and are being experimented on, or when you get hit in a first person view.

However, I have looked all over the scripts in Mothership Zeta and can't find (or see) the proper command for it. Can anyone advise me on the command I would need to play this effect? It would be greatly appreciated.

Thank you in advance :)