I've been playing around with this and I can't get it to work. I want a plane to drop a bomb and after that bomb explodes, gas is left floating around. How do I do that? Like the Virus or Chem Missile? What tags do I need and where do I put them? Weapon or warhead?
Give the warhead a specific animation (rulesmd.ini)and then make that animation spawn a gas particle system (artmd.ini). This is how the virus death anim creates the gas clouds that can continue to damage infantry.