jit.phys.barslide Reference

A bar constraint in a physics world

jit.phys.barslide

Description

The jit.phys.barslide object constrains attached jit.phys.body objects to rotate and translate around a single axis. Limits and motor forces can be specified for both the linear translation and angular rotation around the constraint. If only a single body is bound, it is constrained to a point in world space.

Examples

A bar constraint in a physics world

Attributes

body1 [symbol]

The name of the first jit.phys.body to constrain.

body2 [symbol]

The name of the second jit.phys.body to constrain.

collisions [int]

Enables collisions between attached bodies (default = 0).

damping [float]

Limit damping value (default = 0.7).

enable [int]

Enable this constraint in the physics simulation (default = 1).

linearposition [float]

g/s(get)

Position of constraint along translate axis (default = 0).

lowerlimit_ang [float]

The lower limit of allowed rotation around the bar axis in degrees (default = 1). If lowerlimit is greater than upper limit, no limits are applied to the constraint axis.

lowerlimit_lin [float]

The lower limit of allowed translation along the bar axis (default = 0). If lowerlimit is greater than upper limit, no limits are applied to the constraint axis.

motorstrength_ang [float]

The maximum angular motor impulse (default 1.).

motorstrength_lin [float]

The maximum linear motor impulse (default 1.).

motorvelocity_ang [float]

Enables angular motor and specifies velocity desired in degrees per second (default = 0).

motorvelocity_lin [float]

Enables linear motor and specifies velocity desired in units per second (default = 0).

position1 [3 floats]

The pivot point of body1 as a 3D vector relative to the body1 center of mass (default = 0 0 0).

position2 [3 floats]

The pivot point of body2 as a 3D vector relative to the body2 center of mass (default = 0 0 0). If body2 is blank, this is the worldspace position of the constraint.

quat1 [4 floats]

The quaternion orientation of body1 relative to the constraint (default = 0 0 0 1).

quat2 [4 floats]

The quaternion orientation of body2 relative to the constraint (default = 0 0 0 1). If body2 is blank, this is the worldspace orientation of the constraint.

restitution [float]

Limit restitution value (default = 1.0).

rotate1 [4 floats]

Rotation of body1 relative to the constraint (default = 0 0 0 1).

rotate2 [4 floats]

Rotation of body2 relative to the constraint (default = 0 0 0 1). If body2 is blank, this is the worldspace orientation of the constraint.

rotatexyz1 [3 floats]

Euler rotation of body1 relative to the constraint (default = 0 0 0).

rotatexyz2 [3 floats]

Euler rotation of body2 relative to the constraint (default = 0 0 0). If body2 is blank, this is the worldspace orientation of the constraint.

softness [float]

Limit softness value (default = 1.0).

strength [float]

Set the constraint strength (default = 0.2). Determines what proportion of the joint error will be fixed each simulation step. Values between 0.1 and 0.8 are recommended.

stretch [float]

Set the constraint stretch (default = 0.0). Setting to a positive value allows forces acting on rigid bodies to violate the constraint by an amount proportional to the stretch value.

upperlimit_ang [float]

The upper limit of allowed rotation in degrees around the bar axis (default = -1). If lowerlimit is greater than upper limit, no limits are applied to the constraint axis.

upperlimit_lin [float]

The upper limit of allowed translation along the bar axis (default = 0). If lowerlimit is greater than upper limit, no limits are applied to the constraint axis.

worldname [symbol]

The name of a jit.phys.world context this constraint is bound to.

worldpos [3 floats]

g/s(get)

The derived constraint world position (default = 0 0 0)

worldquat [4 floats]

g/s(get)

The derived constraint world quaternion (default = 0 0 0 1)

Common Box Attributes

Messages

reset

Removes any current forces and returns the attached objects to their original position.

See Also

Name Description
Working with OpenGL Working with OpenGL
jit.phys.world
jit.phys.body
jit.phys.conetwist
jit.phys.hinge
jit.phys.point2point
jit.phys.6dof