Containing particles with a wall (PB only)Use Wall to contain particles, limiting the area within which particles can move. A wall is a closed mask that you create using a mask tool, such as the pen tool. By creating a wall you can make particles stay within a specific area. When a particle hits the wall, it bounces off at a velocity based on the force with which it hit. ![]() Without walls, particles can roam about or exit a frame (left). Walls added to the left and right sides restrict particle movement to the middle of the frame (right). To contain particles within an area:
To turn off the wall:
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