Hi everyone…
I’m looking a solution for particles. I need to create an explosion in a room, but smoke should leave the room by window and under the door…
Also same scenario applies for fire extinguisher too… When I want to stop fir with fire ext. It should not leave the room through wall.
Is anyone have any idea? 
TIA.
Make the walls colliders, and use the collider particle checkbox… just make sure they’re small enough to fit through the window and door opening?
Thanks for help, sawfishusa, But honestly i didn’t understand anything 
But my fault was word collider for particle component. I attached that component to wrong object … When I attach that to particle it worked like charm. I gave 0 for bouncy and 1000 for energy loss. No particles can lave the room now! yey!