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Creates a rising stream of bubbles within the area covered by the brush.
Name (targetname) - Property used to identify entities.
Bubble density (density) - The number of bubbles produced.
Bubble frequency (frequency) - The higher the value, the shorter the delay between each set of bubbles being produced.
Speed of Current (current) - The amount the bubbles move in the direction specified by the angle.
Start Off (1)
This is the only brush-based env entity.
The current FGD doesn't say Pitch Yaw Roll is a property, but it must be, since the compass angle corresponds to Yaw.
Horizontal streams of bubbles cannot be produced with this entity. Use a cycler entity instead, with the 'pipe_bubbles.mdl' model.
The area affected will always be a prism, regardless of the actual shape of the brush.