Physgun Extra Glow Spots

Okay, i’ve been tinkering a bunch with the physgun lately and came across this

i can’t figure out how this was done, i can change colors and add decals wit overlays and such, but i don’t know how to make extra sections of the physgun glow, i plan on making a reskin that has extra spots glowing on it like that, but i kind of need to know HOW to do it first, can anyone help me out here?

$selfillum in the vmt
And an illuminated alpha

Keep in mind this is only a faux glow as it’s not a particle like the physgun beam origin.