Spell visiblilty

[Deratox]

Hey there, i just was wondering where in source the visiblity of auras is handeld.

I have some npc flagged as trigger. On those some spells are casted which apply an aura, but i can't see any visual effect until I activate GM.

I found the function IsNeedSendToClient in SendSpellGo but for me there's no check included if creature is visible for player or not.

Or do i have to set any special flag in DB to get those auras visible?

Kind regards