9.0

156 FORCE FIELDS
DYNAMICS
DYNAMICS
FORCE FIELDS 157
Two small white spheres,
both moving to the right,
are about to enter a
Radial eld whose Shape
is set to Cube. Of the two
spheres, the one on the
left will experience less
force. Due to the offset
shape, the left-hand
sphere will pass through
the edge of the falloff
(dark sphere) only.
In the diagram above are two Radial elds with Shape set to Cube. The shape of the
left Radial eld has been offset above the origin. Note how the left eld’s falloff
(dark sphere) is not offset but instead remains centred on the origin. Apart from the
shape offset, the two Radial elds are identical.
When the two spheres (travelling from left to right) enter their elds, the left sphere
will experience much less force than the right sphere. Although the left sphere will
pass through the centre of the shape, it will pass through the edge of the falloff and
experience only a fraction of the full force. The right sphere will experience more force
than the left sphere because it will pass through a eld region with less falloff.
Dimension
Here you can set the dimensions of the eld numerically. Alternatively, use the Scale
tool to resize interactively in the viewport.
Falloff Tab
A falloff enables a smoother
interaction with objects because
the force will increase gradually
rather than abruptly as the
objects move into the eld.
The parameters on this tab enable you to dene a falloff for the eld so that the
strength of the force will increase gradually towards the centre of the eld as opposed
to uniform force strength throughout the eld.
A falloff enables a smoother interaction with objects because the force will increase
gradually rather than abruptly as the objects move into the eld.