Fields Air
This creates an Air field.
This sets the options when you create an Air field.
Air Field Predefined Settings Wind
Sets the Air Field attributes to default settings that approximate the effects of wind. The connected objects increase their velocity until they match 5 units per frame in an X-axis direction.
Wake
Sets the Air Field attributes to default settings that approximate the movement of air disrupted and pulled along by a moving object. The default settings for wake have no effect on the object unless the air field is moving.
You can animate the motion of the air field or the object that owns the air field, or you can parent the air field to a moving object (see "Example: Creating an air wake from a moving object" on page 220). If you want the effect of the wake with a stationary air field, set Speed to a value greater than 0.
Sets the Air Field attributes to default settings that approximate a local fan effect. The connected objects move in a 45 degree spread along the X-axis at 5 units per frame.
By default, the fan air field creates an air pattern similar to this:
- Fan air field
Magnitude
Sets the strength of the air field, which sets the speed along the direction the air is moving. The Magnitude and Direction X, Y, and Z attributes set the wind velocity.
The larger the number, the stronger the force. You can use a negative number to reverse the direction of the force.
Attenuation
Sets how much the strength of the field diminishes as distance to the affected object increases. The rate of change is exponential with distance; the Attenuation is the exponent. If you set Attenuation to 0, the force remains constant over distance. Negative numbers are not valid.
Note The strength of the air field drops quickly to zero when an object approaches the Max Distance from the field. For a graphical representation of how Attenuation affects the strength of a field with distance, see "Set field attributes with workspace manipulators" on page 215.
Direction X, Y, Z
Specifies the direction the air blows. Speed
Controls how quickly the connected objects match the velocity of the air field. If you set Speed to 0, the objects do not move. If you set Speed to 1, the objects match the velocity of the air field almost instantaneously.
Inherit Velocity (or Inherit)
When an air field is moving or parented to a moving object, Inherit Velocity specifies how much the moving air field's velocity that is added to the Direction and Magnitude. Use a value from 0 to 1.
Velocity of moving object ^
that air field ^
is parented to.
/ Effective velocity S with Inherit Velocity ♦♦ set to 1.
Velocity of air field
Inherit Rotation
If you turn on Inherit Rotation and the air field is rotating or parented to a rotating object, the air flow undergoes that same rotation. Any changes in the rotation of the air field changes the direction that the air field points. This is similar to a rotating fan or air coming from the mouth of a character whose head is moving. Turning on Inherit Rotation affects the effective velocity of the air field.
Inherit Rotation is turned on if you turn on the Wind or Fan buttons.
Component Only
If Component Only is off, the air field applies whatever force is necessary to make the affected object's velocity match the air field's velocity.
If Component Only is on, the air field applies force only in the direction specified by the combination of its Direction, Speed, and Inherit Velocity attributes. Also, no force is applied to slow an object along that direction; force is applied only to increase the speed.
Only objects moving slower than the air field are affected. Objects moving faster than the air field continue at that speed.
Component Only is turned on when you turn on the Wake button. The option has effect only when Inherit Velocity has a nonzero value.
Component Only On Component Only Off
The particles continue in The particles slow the original direction after down significantly after the air (wake) field stops. the air field stops.
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