The Wind space warp
simulates the effect of wind blowing particles generated by a particle
system. Wind is directional. Particles moving in the direction of
the wind arrow accelerate. Particles moving against the arrow decelerate.
In the case of spherical wind, motion is toward or away from the
Wind changing the direction
of the spray of a fountain
Wind is similar in effect
to the Gravity space warp, but has added parameters for turbulence
and other features characteristic of wind in the natural world.
Wind can also be used as an effect in dynamics simulations. See
Wind effect on snow
To create wind:
- On the Create
panel, click (Space
Warps). Choose Forces from the list, then on the Object Type rollout,
- Drag in a viewport.
The wind icon appears.
For planar wind (the default), the icon is a wireframe square with
a direction arrow coming out of one side. For spherical wind, the
icon is a wireframe sphere.
The initial direction
of planar wind is along the negative Z axis of the construction
grid that is active in the viewport where you drag. You can rotate
the wind object to change the direction.
These settings are comparable
to the Gravity parameters.
Increasing Strength increases
the wind effect. Strength less than 0.0 creates a suction. It repels
particles moving in the same direction and attracts particles moving in
the opposite direction. When Strength is 0.0, the Wind warp has
When Decay is set to
0.0, the Wind warp has the same strength throughout world space.
Increasing the Decay value causes wind strength to diminish as distance
increases from the position of the Wind warp object. Default=0.0.
Wind effect is perpendicular
to the plane of the Wind warp object, throughout the scene.
Wind effect is spherical, centered
on the Wind warp object.
These settings are specific
to the Wind space warp.
Causes particles to change
course randomly as the wind blows them. The greater the value, the
greater the turbulence effect.
When set greater than 0.0,
causes turbulence to vary periodically over time. This subtle effect
is probably not visible unless your bound particle system generates
a large number of particles.
Scales the turbulence effect.
When Scale is small, turbulence is smoother and more regular. As
Scale increases, turbulence grows more irregular and wild.
- Range Indicators
When the Decay value
is greater than zero, icons appear in the viewports that represent
the range at which the force of wind is half the maximum value.
When you use the Planar option, the indicators are two planes; when
you use the Spherical option, the indicator is a double-hooped sphere.
- Icon Size
Size of the Wind warp object
icon, in active units. You set the initial Icon Size value when
you drag to create the wind object. This value does not change the wind effect.