Joint Class

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List of functions:

List of Variables:

JOINT_BALL
JOINT_CYLINDRICAL
JOINT_FIXED
JOINT_HINGE
JOINT_PARTICLES
JOINT_PATH
JOINT_PRISMATIC
JOINT_SUSPENSION
JOINT_WHEEL
NUM_JOINTS

This class is used to create joints.

Joint Class

Members

Joint createJoint(int type)

Creates a new joint of the specified type.

Arguments

int type - Joint type. One of the JOINT_* values.

Return value

New created joint instance.

Joint createJoint(string type_name)

Creates a new joint of the specified type.

Arguments

string type_name - Joint type name.

Return value

New created joint instance.

void setAnchor0(Vec3 anchor)

Sets coordinates of the anchor point in a system of coordinates of the first connected body.

Arguments

Vec3 anchor - Coordinates of the anchor point in the body coordinate space.

Vec3 getAnchor0()

Returns the coordinates of the anchor point in a system of coordinates of the first connected body.

Return value

Coordinates of the anchor point in the body coordinate space.

void setAnchor1(Vec3 anchor)

Sets coordinates of the anchor point in a system of coordinates of the second connected body.

Arguments

Vec3 anchor - Coordinates of the anchor point in the body coordinate space.

Vec3 getAnchor1()

Returns the coordinates of the anchor point in a system of coordinates of the second connected body.

Return value

Coordinates of the anchor point in the body coordinate space.

void setAngularRestitution(float restitution)

Sets the current angular restitution (stiffness) of the joint. Angular restitution defines how fast the joint compensates for change of the angle between two bodies. When bodies are turned relative each other, restitution controls the magnitude of force which is applied to both bodies so that their anchor points to become aligned again. For example:

1 means that the joint is to return bodies in place throughout 1 physics tick.
0.2 means that the joint is to return bodies in place throughout 5 physics ticks.

The maximum value of 1 can lead to destabilization of physics (as too great forces are applied).

Arguments

float restitution - Angular restitution. The provided value will be clamped in the range [0;1].

float getAngularRestitution()

Returns the current angular restitution (stiffness) of the joint. Angular restitution defines how fast the joint compensates for change of the angle between two bodies. When bodies are turned relative each other, restitution controls the magnitude of force which is applied to both bodies so that their anchor points to become aligned again. For example:

1 means that the joint is to return bodies in place throughout 1 physics tick.
0.2 means that the joint is to return bodies in place throughout 5 physics ticks.

The maximum value of 1 can lead to destabilization of physics (as too great forces are applied).

Return value

Angular restitution in the range [0;1].

void setAngularSoftness(float softness)

Sets the angular softness (elasticity) of the joint. When the joint is twisted, angular softness defines whether angular velocities of the bodies are averaged out. For example:

0 means that the joint is rigid. Angular velocities of the first and the second body are independent.
1 means that the joint is elastic (jelly-like). If the first body changes its velocity, velocity of the second body is equalized with it.

Arguments

float softness - Angular softness. The provided value will be clamped in the range [0;1].

float getAngularSoftness()

Returns the current angular softness (elasticity) of the joint. When the joint is twisted, angular softness defines whether angular velocities of the bodies are averaged out. For example:

0 means that the joint is rigid. Angular velocities of the first and the second body are independent.
1 means that the joint is elastic (jelly-like). If the first body changes its velocity, velocity of the second body is equalized with it.

Return value

Angular softness in the range [0;1].

void setBody0(Body body)

Sets the first body connected using the joint.

Arguments

Body body - The first body connected with the joint.

Body getBody0()

Returns the first body connected using the joint.

Return value

The first body connected with the joint.

void setBody1(Body body)

Sets the second body connected using the joint.

Arguments

Body body - The second body connected with the joint.

Body getBody1()

Returns the second body connected using the joint.

Return value

The second body connected with the joint.

BodyRigid getBodyRigid0()

Returns the first connected body as a rigid body.

Return value

The first rigid body connected using the joint or NULL (0), if the body is not rigid.

BodyRigid getBodyRigid1()

Returns the second connected body as a rigid body.

Return value

The second rigid body connected using the joint or NULL (0), if the body is not rigid.

void setBroken(int broken)

Sets a value indicating if the joint is broken or not.

Arguments

int broken - Positive number to break the joint, 0 to make it intact.

int isBroken()

Returns a value indicating if the joint is broken or not.

Return value

Positive number if the joint is broken; otherwise, 0.

void setCollision(int c)

Sets a value indicating if collisions between the connected bodies are enabled.

Arguments

int c - Positive number to enable collisions between the bodies, 0 to disable them.

int getCollision()

Returns a value indicating if collisions between the connected bodies are enabled.

Return value

Positive number if collisions between the bodies are enabled; otherwise, 0.

void setEnabled(int enable)

Enables or disables joint calculations.

Arguments

int enable - Positive number to enable the joint, 0 to disable it.

int isEnabled()

Returns a value indicating if the joint calculations are enabled.

Return value

1 if the joint is enabled; otherwise, 0.

int isEnabledSelf()

Returns a value indicating is the joint is enabled.

Return value

1 if the joint is enabled; otherwise, 0.

void setFrozen(int f)

Freezes or unfreezes the joint.

Arguments

int f - Positive number to freeze the joint, 0 to unfreeze it.

int isFrozen()

Returns a value indicating if the joint is frozen or not.

Return value

Positive number if the joint is frozen; otherwise, 0.

int setID(int id)

Sets the unique ID for the joint.

Arguments

int id - Unique ID.

Return value

1 if the ID is set successfully; otherwise, 0.

int getID()

Returns the unique ID of the joint.

Return value

Unique ID.

Joint getJoint()

void setLinearRestitution(float restitution)

Sets the linear restitution (stiffness) of the joint. Linear restitution defines how fast the joint compensates for linear coordinate change between two bodies. When bodies are dragged apart, restitution controls the magnitude of force which is applied to both bodies so that their anchor points to become aligned again. For example:

1 means that the joint is to return bodies in place throughout 1 physics tick.
0.2 means that the joint is to return bodies in place throughout 5 physics ticks.

The maximum value of 1 can lead to destabilization of physics (as too great forces are applied).

Arguments

float restitution - Linear restitution. The provided value will be clamped in the range [0;1].

float getLinearRestitution()

Returns the current linear restitution (stiffness) of the joint. Linear restitution defines how fast the joint compensates for linear coordinate change between two bodies. When bodies are dragged apart, restitution controls the magnitude of force which is applied to both bodies so that their anchor points to become aligned again. For example:

1 means that the joint is to return bodies in place throughout 1 physics tick.
0.2 means that the joint is to return bodies in place throughout 5 physics ticks.

The maximum value of 1 can lead to destabilization of physics (as too great forces are applied).

Return value

Linear restitution in the range [0;1].

void setLinearSoftness(float softness)

Sets the linear softness (elasticity) of the joint. When the joint is stretched, linear softness defines whether linear velocities of the bodies are averaged out. For example:

0 means that the joint is rigid. Linear velocities of the first and the second body are independent.
1 means that the joint is elastic (jelly-like). If the first body changes its velocity, velocity of the second body is equalized with it.

Arguments

float softness - Linear softness. The provided value will be clamped in the range [0;1].

float getLinearSoftness()

Returns the current linear softness (elasticity) of the joint. When the joint is stretched, linear softness defines whether linear velocities of the bodies are averaged out. For example:

0 means that the joint is rigid. Velocities of the first and the second body are independent.
1 means that the joint is elastic (jelly-like). If the first body changes its velocity, velocity of the second body is equalized with it.

Return value

Linear softness value in the range [0;1].

void setMaxForce(float force)

Sets the maximum amount of force that can be exerted on the joint. If this limit is exceeded, the joint breaks.

Arguments

float force - Maximum amount of force.

float getMaxForce()

Returns the maximum amount of force that can be exerted on the joint. If this limit is exceeded, the joint breaks.

Return value

Maximum amount of force.

void setMaxTorque(float torque)

Sets the maximum amount of torque that can be exerted on the joint. If this limit is exceeded, the joint breaks.

Arguments

float torque - Maximum amount of torque.

float getMaxTorque()

Returns the maximum amount of torque that can be exerted on the joint. If this limit is exceeded, the joint breaks.

Return value

Maximum amount of torque.

void setName(string name)

Sets the name of the joint.

Arguments

string name - Name of the joint.

string getName()

Returns the name of the joint.

Return value

Name of the joint.

void setNumIterations(int num_iterations)

Sets the number of iterations used to solve joints. Note that if this value is too low, the precision of calculations will suffer.

Arguments

int num_iterations - Number of iterations. If a non-positive value is provided, 1 will be used instead.

int getNumIterations()

Returns the current number of iterations used to solve joints.

Return value

Number of iterations.

int getType()

Returns the type of the joint.

Return value

One of the JOINT_* pre-defined variables.

string getTypeName()

Returns the name of the joint type.

Return value

Type name.

string getTypeName(int type)

Returns the name of a joint type with a given ID.

Arguments

int type - Joint type ID. One of the JOINT_* values.

Return value

Joint type name.

void setWorldAnchor(Vec3 anchor)

Sets the anchor point in the world coordinates.

Arguments

Vec3 anchor - Coordinates of the anchor point in the world space.

Vec3 getWorldAnchor()

Returns the anchor point in the world coordinates.

Return value

Coordinates of the anchor point in the world space.

Joint clone()

Clones the joint.

Return value

Copy of the joint.

void renderVisualizer(vec4 color)

Renders the joint.

NoticeYou should enable the engine visualizer by the show_visualizer 1 console command.

Arguments

vec4 color - Color, in which the joint will be rendered.

int restoreState(Stream stream)

Restores the state of a given node from a binary stream.

If a node is a parent for other nodes, states of these child nodes need to be restored manually.
To save the state into a buffer, file or a message from a socket, make sure the stream is opened. If necessary, you can set a position for writing for buffers and files.

Warning

This function is deprecated and will be removed in the next release.

Arguments

Stream stream - Stream with saved node state data.

Return value

1 if node state is successfully restored; otherwise, 0.

int saveState(Stream stream)

Saves the state of a given node into a binary stream.

If a node is a parent for other nodes, states of these child nodes need to be saved manually.
To save the state from a buffer, file or a message from a socket, make sure the stream is opened. For buffers and files, you also need to set the proper position for reading.

Warning

This function is deprecated and will be removed in the next release.