fixed errorCode:local surfacepenetration = { [MAT_ANTLION] = 1, [MAT_BLOODYFLESH] = 0, [MAT_CONCRETE] = 1, [MAT_DIRT] = 1, [MAT_EGGSHELL] = 0, [MAT_FLESH] = 0, [MAT_GRATE] = 0, [MAT_ALIENFLESH] = 0, [MAT_CLIP] = 0, [MAT_SNOW] = 1, [MAT_PLASTIC] = 1, [MAT_METAL] = 1, [MAT_SAND] = 1, [MAT_FOLIAGE] = 0, [MAT_COMPUTER] = 0, [MAT_SLOSH] = 0, [MAT_TILE] = 1, [MAT_GRASS] = 1, [MAT_VENT] = 0, [MAT_WOOD] = 1, [MAT_DEFAULT] = 1, [MAT_GLASS] = 0, [MAT_WARPSHIELD] = 1, } function isVisible(s,e) local trc = util.TraceLine({ start = s, endpos = e, filter = {LocalPlayer()}, mask = MASK_SHOT, }) return trc.Fraction >= surfacepenetration[trc.MatType] end