##### Fan Object

The fan object indicates the strength and direction that the wind is blowing. The fan is a screen-space object that rotates with the camera.

Hold the 'F' key and move the mouse to rotate the fan.

# Global

## boolean Strength

How strong the wind is (0.0 to 1.0) as indicated by the blue bar below the fan. Hold down 'F' and drag the pointer up down with the middle mouse button pressed to vary this value interactively.

# Color

## seconds Strength Response Time

How fast in seconds the strength can get from 0.0 to 1.0 for this tree model. Increase this number to slow down how quickly the tree responds to wind strength changes (the white tick on the blue bar indicates where the strength really is).

## seconds Direction Response Time

How fast in seconds the direction can change by 180 degrees. Increase this number to slow down how quickly the tree responds to wind direction changes.

# Primary

## float Strength Exponent

Controls how quickly the primary wind motion (side to side oscillation) responds to wind strength changes. Increase this number to make primary wind motion take longer to take affect when the wind strength increases.

## float Height

Primary motion is controlled by each vertices Z position relative to the trees height. Set the height of the tree here to roughly the height of your tree.

## float Height Exponent

By default, the tree will oscillate more at the top than at the bottom in a linear fashion (when the exponent is 1.0). Increase this value to make the effect focused higher up the tree.

## float Height Offset

Under large oscillations the tree geometry will stretch. Increase this value to combat this by lowering the Z coordinate of each vertex based on how much it moved (the value is a percentage of how much it moved).

## float Distance: Low Wind

Controls how far the tree moves during each oscillation at low wind strengths.

## float Distance: High Wind

Controls how far the tree moves during each oscillation at high wind strengths.

## float Frequency: Low Wind

Controls how fast the tree oscillates at low wind strengths.

## float Frequency: High Wind

Controls how fast the tree oscillates at high wind strengths.

# Secondary

## float Strength Exponent

Controls how quickly the secondary wind motion (random direction oscillation) responds to wind strength changes. Increase this number to make secondary wind motion take longer to take affect when the wind strength increases.

## float Distance: Low Wind

Controls how far the tree moves during each oscillation at low wind strengths.

## float Distance: High Wind

Controls how far the tree moves during each oscillation at high wind strengths.

## float Frequency: Low Wind

Controls how fast the tree oscillates at low wind strengths.

## float Frequency: High Wind

Controls how fast the tree oscillates at high wind strengths.

# Leaves

## float Strength Exponent

Controls how quickly the leaf wind motion responds to wind strength changes. Increase this number to make leaf wind motion take longer to take affect when the wind strength increases.

## float Lighting Change

Controls how much the lighting changes on leaves as they oscillate. Higher numbers result in a more dramatic effect.

## float Windward Scalar

Wind oscillation distances are multiplied by this amount for leaves on the side of the tree that the wind is blowing towards.

## float Distance: Low Wind

Controls how far the leaf vertices move during each oscillation at low wind strengths.

## float Distance: High Wind

Controls how far the leaf vertices move during each oscillation at high wind strengths.

## float Frequency: Low Wind

Controls how fast the leaves oscillate at low wind strengths.

## float Frequency: High Wind

Controls how fast the leaves oscillate at high wind strengths.

# Frond Ripple

## float Strength Exponent

Controls how quickly the frond ripple motion responds to wind strength changes. Increase this number to make frond rippling take longer to take affect when the wind strength increases.

## float Distance: Low Wind

Controls how far the frond vertices move during each oscillation at low wind strengths.

## float Distance: High Wind

Controls how far the frond vertices move during each oscillation at high wind strengths.

## float Frequency: Low Wind

Controls how fast the frond vertices oscillate at low wind strengths.

## float Frequency: High Wind

Controls how fast the frond vertices oscillate at high wind strengths.

## float V Tile

Sample tiling along the length of the frond.

## float U Tile

Sample tiling across the frond.

# Gust

## float Frequency

Controls how often gusts occur. Higher numbers result in more gusting.

## float Primary Distance

How much the entire tree leans in the direction of the wind based on the combined strength of the strength setting and how strong the gust is. Gust strength is indicated by the red bar under the fan.

## float Secondary Distance Scale

Increase this number from 1.0 to make secondary oscillations go with the wind. Doing this results in branch stretching and must be used sparingly.

## float Strength: Min

The minimum strength each new gust can be. This value is added to the nominal wind strength.

## float Strength: Max

The maximum strength each new gust can be. This value is added to the nominal wind strength.

## float Duration: Min

The shortest time period each new gust can last in seconds.

## float Duration: Max

The longest time period each new gust can last in seconds.

## float Direction Adjustment

Positive numbers cause branches and fronds to blow up in high wind, negative numbers make them blow down in high wind.

## float Unison

This parameter controls how much wind direction is adhered to in secondary oscillations. 0.0 means not at all and 1.0 means all branches point in the direction of the wind as much as they can and do not oscillate.

# Transform

## percentage Rotation: Axis: X, Y, & Z

The X,Y, and Z components of the Rotation: Angle.

## degrees Rotation: Angle

The amount of rotation around the rotation angle.