2008

Left: Volume light with noise
Right: Reducing the size value
Phase Controls the speed of the wind. If you have Wind Strength also set
to greater than 0, the fog volume animates in accordance with the wind
direction. With no Wind Strength, the fog churns in place. Because there's an
animation track for phase, you can use the Function Curve editor to define
precisely how you want your wind "gusts" to happen.
Wind moves the fog volume in the specified direction over time. Wind is tied
to the phase parameter so as the phase changes, the wind moves. If Phase isn’t
animated there will be no wind.
Wind Strength Controls how fast the smoke moves away from the wind
direction, relative to phase. As mentioned above, if the phase is not animated
then the smoke won’t move, regardless of the wind strength. By having the
phase animate slowly with a large wind strength, the fog moves more than it
churns.
Alternatively, if the phase changes rapidly while the wind strength is relatively
small, the fog will churn fast and drift slowly. If you want the fog to just churn
in place, animate the phase but keep wind strength at 0.
Wind from the Defines the direction the wind is coming from.
Exposure Controls
Rendering menu > Environment > Environment and Effects dialog >
Environment panel > Exposure Control rollout
Exposure Controls | 6531