2009

Align Spaces To Use these options to align the bodies' local constraint spaces.
You can find out more about each option in the
Working With Constraint
Spaces
on page 3928 section.
Lock Relative Transform When on, the relative transform between the child
and parent constraint spaces is locked: If you move either space in the viewport,
the other space moves along with it.
Stiffness The strength of the spring; governs the force the spring applies to
each attached body for each unit difference between its current length and
its rest length. Values greater than or equal to 0.0 are valid. Default=10.0.
Rest Length The spring applies forces to the attached objects in an attempt
to reach this length. You can specify a figure in world units for this value, or
you can use the Set button. The spring’s rest length is displayed in the
viewports as the length of the displayed line between the two small box
markers. The large box markers are the objects’ attachment points.
Set Click this button to set the spring’s rest length to the current distance
between the two objects’ attachment points.
Damping Determines how quickly the oscillation of the spring settles down.
It governs the forces applied to the connected bodies due to the relative
velocities of their connection points. Valid damping values are those greater
than or equal to 0.0. The default damping value is 1.0.
TIP Typically, a Damping value of 1/10th of the stiffness yields good results.
Act on compression When on, the spring applies forces to the attached objects
when its length is less than its Rest Length. Default=on.
Act on extension When on, the spring applies forces to the attached objects
when its length is greater than its Rest Length.
Disabled When on, the spring is not used in the simulation.
Reset Default Values Click this to set Stiffness, Rest Length, Damping, Act
On Extension, and Act On Compression to their respective default values.
Linear Dashpot
Create panel > Helpers > reactor > L Dashpot
Animation menu > reactor > Create Object > Linear Dashpot
3934 | Chapter 16 reactor