The Spring controller
adds secondary dynamics effects to any point or object position.
The end result is secondary mass/spring dynamics similar to Flex.
This constraint adds realism to generally static animations.
When you apply Spring
to an animated object, its original motion is preserved and secondary,
velocity-based dynamics are applied. You can control the object's
mass and drag. When you first apply the controller, it constructs
a virtual spring between the object's original position and where it
would end up after forces are applied to it.
You can adjust spring
tension and dampening. Increasing the tension creates a tighter
spring, while increasing the dampening smoothes out jitters in the
motion. You can add external forces like
affect the motion, and also add additional objects whose motions
act as springs.
NoteYou can also assign
the Spring controller to animated vertices in Track View: Open the
object's Master Point Controller hierarchy, select the vertices,
and assign the Spring controller.
When you assign a Spring
controller to an object, its rollouts automatically appear in the
Motion panel. In addition, the rollouts open in a floating dialog.
If you close the dialog, you can reopen it by right-clicking the track
in the Motion panel Assign Controller rollout or in the Track View
hierarchy and choosing Properties, or clicking the Properties button
on the Track View toolbar.
The mass of the object
to which the Spring controller is applied. Increasing the mass causes
the "bouncing" spring motion to become more exaggerated.
Acts as air friction
on the spring motion. A low Drag setting results in a greater "bouncing"
effect, while a high Drag results in subdued bouncing. Default=1. Range=0
Add springs to an object
using the Spring controller when you want the object to be affected
by the motion of other objects in your scene. This effectively creates
virtual springs between objects.
Click this button, and then
select one or more objects whose motion relative to the spring-controlled
object will act as springs on that object. To finish adding springs,
click Add again, right-click in a viewport, or press Esc.
Removes highlighted spring
objects from the list.
NoteYou cannot remove
the Self Influence list entry, which is the spring-controlled object's
influence on itself.
Lists all spring objects
by name, and displays each object's Tension and Dampening settings
separated by a slash (/). The spring-controlled object's influence
on itself appears as Self Influence, and cannot be deleted. However,
you can effectively remove the object's influence on itself by setting
Tension and Dampening to 0, resulting in no motion.
To set Tension and Dampening
for one or more objects in the list, highlight them in the list
and then adjust the settings.
The "stiffness" of the virtual
spring between the controlled object and the highlighted spring object(s).
Acts as a multiplier
of an internal factor that determines how quickly the object comes
With the Self Influence
spring, changing Dampening has the same effect as changing Drag.
With other springs, Dampening affects only the movement caused by
Internally, the dampening
value is proportional to the tension, so as you increase the tension
and make the solution more stiff, the dampening is increased to
maintain system stability.
With Relative chosen, changing
the Tension and Dampening settings causes the new settings to be
added to the existing values. With Absolute chosen, the new settings
replace the existing values.
Forces Limits and Precision
External Forces group
Click this button, and then
select one or more space warps in the Forces category that are to
affect the object's motion. To finish adding space warps, click
Add again, right-click in a viewport, or press Esc.
Removes highlighted space
warps from the list.
Lists all spring space warps
- Start Frame
The frame at which the Spring
controller first takes effect. Default=0.
The accuracy of the controller
application. If you get unexpected results, try increasing this
setting. Default=2. Range=0 to 4.
- X/Y/Z Effect
These settings let you control
the percentage of the effect on the individual world axes. Default=100.0.
Range=0 to 1000.0.