I got rid of the flickering by disabling some options in sikkmod (soft shadows) but I dont have a paralax occlusion mapping folder. where do you get it ? I want to see those POM effects.
Look at my post history, it's somewhere in there (the one about vfp files and glprog folder).
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By the way, gameplay related for a change. You guys know the tentacle soldier enemy (just looked it up he's called Zombie Commando)? I used to think he was undodgeable but he's not. While he's charging at you fire, then DUCK when he leaps in to swing his arm. Keep shooting and he'll come forward to kick you, but if you back up it won't land. By the time he gets close enough you'll have downed him. Crouching is equally helpful for crowd control with cherubs and the trites/ticks since you'll only have to face the right direction instead of also aiming at the correct downward angle while getting pummeled. And Plasma is best for Lost Soul crowd control.