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### compute rigid command

### compute multisphere command

Syntax:

    compute ID group-ID rigid (or multisphere) property property_name

- ID, group-ID are documented in compute command
- property = obligatory keyword
- property_name = xcm or vcm or fcm or torque or quat or angmom or omega or density or type or id or masstotal or inertia or ex_space or ey_space or ez_space

        xcm = body position (based on center of mass) (3 values)
        vcm = body velocity (based on center of mass) (3 values)
        fcm = body force (based on center of mass) (3 values)
        torque = body torque (based on center of mass) (3 values)
        quat = body quaternion (based on center of mass) (4 values)
        angmom = body angular momentum (based on center of mass) (3 values)
        omega = body angular velocity (based on center of mass) (3 values)
        density = body density (1 value)
        atomtype = atom type (material type) of the rigid body (1 value)
        clumptype = multi-sphere type as defined in fix paticleteplate/multisphere (1 value)
        id_multisphere = body id (1 value)
        masstotal = body mass (1 value)
        inertia = body intertia (based on center of mass, around ex_space, ey_space, ez_space) (3 values)
        ex_space, ey_space, ez_space = eigensystem of the body (based on center of mass) (3 values each)

Examples:

    compute xcm all rigid property xcm
    compute xcm all multisphere property xcm

Description:

Define a computation that calculates properties of individual multi-sphere bodies (clumps) in the similation that were defined via fix particletemplate/multisphere

The local data stored by this command is generated by looping over the all the bodies owned on a process.

IMPORTANT NOTE: the group-ID is ignored for this command, as group data is atom-based, not clump-based.

Output info:

This compute calculates a local vector or local array depending on the length of the data (see above). The vector or array can be accessed by any command that uses local values from a compute as input. See this section for an overview of LIGGGHTS(R)-PUBLIC output options.

Restrictions:

Can only be used together with a granular pair style. For accessing particle-wall contact data, only mesh walls can be used.

Related commands:

dump local, compute property/local

Default: none