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rigidSolver node |
Rigid Solver Attributes
Step Size
Sets how often within a frame the rigid body calculations occur. For example, if each frame of the animation is 0.1 seconds and the Step Size is 0.033 seconds, the solver calculates rigid body animation three times in the frame.
Generally, decreasing the Step Size value improves rigid body animation accuracy but slows scene play. If you have fast-moving rigid bodies that don’t collide as expected, decrease the Step Size. This is a nonkeyable attribute available in the Attribute Editor only.
Collision Tolerance
Sets how accurately and quickly a rigid body solver detects collisions. Generally, smaller Collision Tolerance values increase the calculation time and collision accuracy. A small Collision Tolerance is often necessary to create accurate collisions involving tiny or thin objects. This is a nonkeyable attribute available in the Attribute Editor only.
Scale Velocity
Scale Velocity is used with the Display Velocity attribute (see page 389). If you turn on Display Velocity, a moving rigid body displays a velocity arrow icon that represents the magnitude and direction of the rigid body motion. You can change the Scale Velocity to scale the arrow.
Start Time
Sets the Time Slider frame when the solver starts animating dynamics for the rigid bodies it controls.
Current Time
Lets you speed up or slow down dynamic animation for all rigid bodies connected to the solver. Current Time works the same for rigid bodies as it does for particle objects. See Control the timing of particle dynamics.
Rigid Solver Methods
Solver Method
Provides a pop-up menu for choosing the accuracy and speed of rigid body calculations
Midpoint
Calculates faster with less accuracy.
Runge-Kutta
Calculates at medium speed and accuracy.
Runge-Kutta Adaptive
Calculates slower but with most accuracy. This is the default setting.
Rigid Solver States
State
Turns off or on the effect of fields, collisions, and rigid body constraints for the rigid bodies it controls. If you want to speed up playback of your animation and temporarily are not concerned with rigid body effects, turn off the State.
Friction
Sets whether the rigid bodies stick or slide after collision. If Friction is on, the rigid bodies stick; if Friction is off, they slide.
If the contact between rigid bodies is limited to instantaneous collisions, the Friction setting does not affect it much. Turning off Friction might speed playback.
Bounciness
Turns bounciness on or off. When off, objects won’t bounce against each other, but rigid body animation plays faster.
Contact Motion
When on, Maya simulates Newtonian physics for its rigid body dynamics. When off, Maya simulates a damped environment without inertia. More specifically, collision forces such as Bounciness and Friction do not affect the rigid bodies. Fields affect the rigid bodies, but not initial spin, initial velocity, or impulses.
Contact Data
Accumulates data about contact between rigid bodies in the scene (see Contact attributes).
Allow Disconnection
By default, you cannot break connections from a rigid body to the rigid body solver that handles its dynamic animation. You can turn on Allow Disconnection so that you can break the connections. See Warning when you delete rigid body connections. Available in the Attribute Editor only.
Cache Data
If you turn this on, Maya caches in memory the dynamic state of all rigid bodies connected to this solver. You can thereafter examine the animation of the rigid bodies by scrubbing the Time Slider or playing in reverse. See Memory caching.
Delete Cache
Deletes the cached dynamic state of all rigid bodies connected to this solver.
Rigid Solver Display Options
Display Constraint
Displays icons for rigid body constraints. See Edit attributes of a rigid body solver
Display Center of Mass
Displays an icon for the center of mass of each rigid body.
Display Velocity
Displays arrow icons that indicate the velocity magnitude and direction of rigid bodies. See Scale Velocity to tune the display of the arrow.
Display Label
Labels rigid bodies as active or passive. Also shows the type of constraint.
