The Gravity space warp
simulates the effect of natural gravity on particles generated by
a particle system. Gravity is directional. Particles moving in the
direction of the gravity arrow accelerate. Particles moving against
the arrow decelerate.
Particles falling because
In the case of spherical
gravity, motion is toward the icon. Gravity can also be used as
an effect in dynamics simulations. See
Gravity effect on snow
To create gravity:
- On the Create
panel, click (Space
Warps). Choose Forces from the list, then on the Object Type rollout,
- Drag in a viewport.
The Gravity icon appears.
For planar gravity (the default), the icon is a wireframe square
with a direction arrow on one side. For spherical gravity, the icon
is a wireframe sphere.
The initial direction
of planar gravity is along the negative Z axis of the construction
grid that is active in the viewport where you drag. You can rotate
the gravity object to change the direction.
Increasing Strength increases
the effect of gravity; that is, how objects move in relation to
the Gravity icon's direction arrow. Strength less than 0.0 creates negative
gravity, which repels particles moving in the same direction and
attracts particles moving in the opposite direction. When Strength
is set to 0.0, the Gravity space warp has no effect.
When Decay is set to
0.0, the Gravity space warp has the same strength throughout world
space. Increasing the Decay value causes gravity strength to diminish
as distance increases from the position of the gravity warp object. Default=0.0.
Gravity effect is perpendicular
to the plane of the Gravity warp object throughout the scene.
Gravity effect is spherical,
centered on the Gravity warp object. This choice is effective for
creating water fountain or planetary effects.
- Range Indicators
When on, and when the Decay
value is greater than 0.0, icons in the viewports indicate the range
at which the force of gravity is half the maximum value. For the Planar
option, the indicators are two planes; for use the Spherical option,
the indicator is a double-hooped sphere.
- Icon Size
Size of the Gravity warp object
icon, in active units. You set the initial size when you drag to
create the Gravity object. This value does not change the gravity effect.