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Apply Relationship dynamics node

Creates relationships between simulation objects.

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Parameters
Inputs
Outputs
Locals
Examples

The Apply Relationship DOP creates one or more relationships between a group of objects. Relationships control the way that objects interact with each other, as well as controlling the order in which objects are solved in the simulation. Some examples of relationships are constraints, collisions, smoke sources, and simple groups.

In a relationship there are two sets of objects, the affector objects and the affected objects. The same object or objects can be in both groups, in which case there are mutually affecting objects in the relationship. When solving objects, any object that is an affector of another object will be solved before the affected object. The exception to this is mutually affecting objects, which must be solved at the same time.

It it also possible to set up mutually affecting relationships indirectly by creating circular relationships between groups of objects. You can inspect the entire set of affector relationships in a simulation by looking at the Affector Matrix in the Geometry Spreadsheet for the simulation.

Each relationship type node (Constraint and Collision Relationship, for example) is capable of creating a single relationship between two groups of objects. The Apply Relationship node augments these capabilities by allowing a large number of relationships to be created using a small number of nodes and stamping.

This node’s parameters are divided into two parts. The first part describes the number of relationships that will be created, and the sets of objects that will be the affector and affected objects. The second part defines the stamp variables that can be used by the attached relationship nodes to customize each relationship.

Relationships must each be given a unique name which identifies them. This name can be used to access relationship information using all the same methods that are used to access data on simulation objects.

Tip

Create Relationships should be set to Number of Relationships Per Object Pair when building mutual constraints between two DOPs. This is necessary for the constraint to find the goal objects. You should also enable Make All Objects Mutual Affectors to avoid the one-way affector relationships.

Parameters

Create Relationships

Controls the primary mode of operation for creating relationships.

Number of Relationships

Specifies an exact number of relationships which will be created. The Affector Objects and Affected Objects fields are evaluated once per relationship.

Number of Relationships Per Affected Object

Specifies that a number of relationships will be created for each individual object listed in the Affected Object parameter. The Affector Objects parameter will be re-evaluated for each Affected object.

Number of Relationships Per Affector Object

Specifies that a number of relationships will be created for each individual object listed in the Affector Object parameter. The Affected Objects parameter will be re-evaluated for each Affector object.

Number of Relationships Per Object Pair

Specifies that a number of relationships will be created for each pair of affector and affected objects. The Affector Objects and Affected Objects parameters will be evaluated once to obtain the list of objects that will be paired up

Affected Objects

These objects are the affected objects in the created relationships. This parameter will be re-evaluated for each relationship if the Create Relationships parameter is set to Number of Relationships Per Affector Object, or Number of Relationships. Otherwise it is evaluated once.

Affector Objects

These objects are the affector objects in the created relationships. This parameter will be re-evaluated for each relationship if the Create Relationships parameter is set to Number of Relationships Per Affected Object, or Number of Relationships. Otherwise it is evaluated once.

Number of Relationships

The number of relationships created per affector object, per affected object, per object pair, or an absolute number of relationships, depending on the Create Relationships parameter value. In all but the Number of Relationships setting, this parameter is re-evaluated for each affector, affected, or pair of objects.

Relationship Name

A unique name that will identify the relationship. This parameter is re-evaluated for every relationship created by this node. If this parameter evaluates to the name of a relationship that already exists (whether or not the relationship was created by this node) it will replace that existing relationship.

Unique Relationship Name

Turning this parameter on ensures that the name generated by the Relationship Name parameter is unique, thus avoiding any chance of overwriting existing relationships. It can result in longer, harder to use relationship names.

Make All Objects Mutual Affectors

Turning on this parameter causes each relationship created by this node to put all affected and affector objects into both the affector and affected object list of the relationship. This parameter does not affect the number of relationships created by this node.

Activation

If this parameter is zero, no relationships are created between the input objects.

This parameter is evaluated before creating each relationship, and so can be used to turn off certain relationships.

Number of Variables

Sets the number of global parameters that will be set for each relationship that is created.

These global parameters are accessible from the input relationship nodes using the stamp expression function.

Variable # Name

The name for this variable. This is the value that must be passed as the second argument to the stamp expression function to access this variable.

Variable Evaluation

Controls the way in which this variable is evaluated.

Evaluate For Each Copy

The value for this variable is calculated for each relationship. This option provides the most flexibility in terms of generating the global parameter values, but is the most time consuming if large numbers of copies are involved.

Evaluate Once

The value for this variable is calculated each time the REL local variable is set to zero. This depends on the Create Relationship parameter. This approach will not result in each relationship being customized, but provides an easy way to pass information from this node up to the input data nodes.

Evaluate Once, One Token Per Copy

The parameter describing this variable is evaluated each time the REL variable is set to zero, which depends on the Create Relationship parameter.

In this mode, the String Value is evaluated regardless of the Variable Type parameter. Then for each relationship, the corresponding token within the evaluated string is used to set the global parameter value. The token is treated as a float or string value, depending on the Variable Type parameter. So for example, suppose the Variable Type is Float, the String Value is "0 1 2 3", and the Number of Relationships is 6. The global parameter value set for the 6 relationships would be 0, 1, 2, 3, 0, and 1.

Variable Type

Specifies whether the global parameter is a floating point number or a string value.

Float

The global parameter is a floating point number. The value of this global parameter will be accessed using the stamp expression function in the input data node.

String

The global parameter is a string. The value of this global parameter will be accessed using the stamps expression function in the input data node.

Float Value

For a Float Variable Type, when the Variable Evaluation is not Evaluate Once, One Token Per Copy, this parameter controls the value that will be assigned to this global parameter.

String Value

For a String Variable Type, or when the Variable Evaluation is Evaluate Once, One Token Per Copy, this parameter contains the string value or series of numeric or string tokens that will be used to set the value of this global parameter.

Inputs

First

The first input to this node supplies the objects that can be used when defining the relationships.

Subsequent

The remaining inputs to this node define the nature of the relationships that will be created.

Outputs

First

The objects or data input to this node are sent through the single output.

Locals

REL

The current relationship number. This value will range from zero to (NREL-1). It can be used to set stamping variables, or otherwise customize the relationships. This index does not take into account multiple relationship inputs. For that, the INPUT variable can be used.

NREL

The total number of relationships that this node will try to create. This value is equal to the Number of Relationships parameter value. It is re-evaluated for each cycle of relationships, as defined by the Create Relationships parameter.

INPUT

The index of the relationship input being processed.

RELID

This is a simple counter for the number of relationships actually created by this node so far this timestep. Because of changing Activation parameter values and the various Create Relationships methods, this is not something that can be calculated from the other local variable values.

AFFECTEDID

If the Create Relationships style is Per Affected Object or Per Object Pair, this variable will contain the object id of the single affected object for this relationship. Otherwise this value will be -1.

AFFECTORID

If the Create Relationships style is Per Affector Object or Per Object Pair, this variable will contain the object id of the single affector object for this relationship. Otherwise this value will be -1.

This value is the simulation time for which the node is being evaluated.

This value may not be equal to the current Houdini time represented by the variable T, depending on the settings of the DOP Network Offset Time and Time Scale parameters.

This value is guaranteed to have a value of zero at the start of a simulation, so when testing for the first timestep of a simulation, it is best to use a test like $ST == 0 rather than $T == 0 or $FF == 1.

This value is the simulation frame (or more accurately, the simulation time step number) for which the node is being evaluated.

This value may not be equal to the current Houdini frame number represented by the variable F, depending on the settings of the DOP Network parameters. Instead, this value is equal to the simulation time (ST) divided by the simulation timestep size (TIMESTEP).

TIMESTEP

This value is the size of a simulation timestep. This value is useful to scale values that are expressed in units per second, but are applied on each timestep.

SFPS

This value is the inverse of the TIMESTEP value. It is the number of timesteps per second of simulation time.

SNOBJ

This is the number of objects in the simulation. For nodes that create objects such as the Empty Object node, this value will increase for each object that is evaluated.

A good way to guarantee unique object names is to use an expression like object_$SNOBJ.

NOBJ

This value is the number of objects that will be evaluated by the current node during this timestep. This value will often be different from SNOBJ, as many nodes do not process all the objects in a simulation.

This value may return 0 if the node does not process each object sequentially (such as the Group DOP).

OBJ

This value is the index of the specific object being processed by the node. This value will always run from zero to NOBJ-1 in a given timestep. This value does not identify the current object within the simulation like OBJID or OBJNAME, just the object’s position in the current order of processing.

This value is useful for generating a random number for each object, or simply splitting the objects into two or more groups to be processed in different ways. This value will be -1 if the node does not process objects sequentially (such as the Group DOP).

OBJID

This is the unique object identifier for the object being processed. Every object is assigned an integer value that is unique among all objects in the simulation for all time. Even if an object is deleted, its identifier is never reused.

The object identifier can always be used to uniquely identify a given object. This makes this variable very useful in situations where each object needs to be treated differently. It can be used to produce a unique random number for each object, for example.

This value is also the best way to look up information on an object using the dopfield expression function. This value will be -1 if the node does not process objects sequentially (such as the Group DOP).

ALLOBJIDS

This string contains a space separated list of the unique object identifiers for every object being processed by the current node.

ALLOBJNAMES

This string contains a space separated list of the names of every object being processed by the current node.

OBJCT

This value is the simulation time (see variable ST) at which the current object was created.

Therefore, to check if an object was created on the current timestep, the expression $ST == $OBJCT should always be used. This value will be zero if the node does not process objects sequentially (such as the Group DOP).

OBJCF

This value is the simulation frame (see variable SF) at which the current object was created.

This value is equivalent to using the dopsttoframe expression on the OBJCT variable. This value will be zero if the node does not process objects sequentially (such as the Group DOP).

OBJNAME

This is a string value containing the name of the object being processed.

Object names are not guaranteed to be unique within a simulation. However, if you name your objects carefully so that they are unique, the object name can be a much easier way to identify an object than the unique object identifier, OBJID.

The object name can also be used to treat a number of similar objects (with the same name) as a virtual group. If there are 20 objects named "myobject", specifying strcmp($OBJNAME, "myobject") == 0 in the activation field of a DOP will cause that DOP to operate only on those 20 objects. This value will be the empty string if the node does not process objects sequentially (such as the Group DOP).

DOPNET

This is a string value containing the full path of the current DOP Network. This value is most useful in DOP subnet digital assets where you want to know the path to the DOP Network that contains the node.

Note

Most dynamics nodes have local variables with the same names as the node’s parameters. For example, in a Position node, you could write the expression:

$tx + 0.1

…to make the object move 0.1 units along the X axis at each timestep.

Examples

ApplyRelationship Example for Apply Relationship dynamics node

This example shows how you can use the Apply Relationship DOP to add pin constraints to wire objects.

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BridgeCollapse Example for Apply Relationship dynamics node

This example shows how to use the Apply Relationship DOP to propagate constraints automatically and create an RBD simulation of a collapsing bridge.

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ConstrainedTeapots Example for Apply Relationship dynamics node

This example demonstrates how the Apply Relationship DOP can be used to create multiple constraints with the RBD Pin Constraint node.

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MutualConstraints Example for Apply Relationship dynamics node

This example demonstrates how to build mutual constraints between two DOP objects using the Apply Relationship node.

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The following examples include this node.

ApplyRelationship Example for Apply Relationship dynamics node

BridgeCollapse Example for Apply Relationship dynamics node

ConstrainedTeapots Example for Apply Relationship dynamics node

MutualConstraints Example for Apply Relationship dynamics node

Chain Example for RBD Pin Constraint dynamics node

ReferenceFrameForce Example for Reference Frame Force dynamics node

Dynamics nodes

Active Value

Marks a simulation object as active or passive.
Affector

Creates affector relationships between groups of objects.
Agent Arcing Clip Layer

Blends between a set of animation clips based on the agent’s turn rate.
Agent Clip Layer

Layers additional animation clips onto an agent.
Agent Look At

Chooses an object/position for the head of an agent to look at.
Agent Look At Apply

Moves the head of an agent to look at a target.
Agent Terrain Adaptation

Adapts the legs of an agent to conform to terrain and prevent the feet from sliding.
Agent Terrain Adaptation

Adapts the legs of a biped agent to conform to terrain.
Agent Terrain Projection

Project the agent/particle points onto the terrain
Anchor: Align Axis

Defines an orientation that aligns an axis in object space with a second axis defined by the relative locations of two positional anchors.
Anchor: Object Point Group Position

Defines multiple points, specified by their number or group, on the given geometry of a simulation object.
Anchor: Object Point Group Rotation

Defines orientations based on multiple points on the given geometry of a simulation object.
Anchor: Object Point Id Position

Defines a position by looking at the position of a point on the geometry of a simulation object.
Anchor: Object Point Id Rotation

Defines an orientation by looking at a point on the geometry of a simulation object.
Anchor: Object Point Number Position

Defines a position by looking at the position of a point on the geometry of a simulation object.
Anchor: Object Point Number Rotation

Defines an orientation by looking at a point on the geometry of a simulation object.
Anchor: Object Primitive Position

Defines a position by looking at the position of a particular UV coordinate location on a primitive.
Anchor: Object Space Position

Defines a position by specifying a position in the space of some simulation object.
Anchor: Object Space Rotation

Defines an orientation by specifying a rotation in the space of some simulation object.
Anchor: Object Surface Position

Defines multiple attachment points on a polygonal surface of an object.
Anchor: World Space Position

Defines a position by specifying a position in world space.
Anchor: World Space Rotation

Defines an orientation by specifying a rotation in world space.
Apply Data

Attaches data to simulation objects or other data.
Apply Relationship

Creates relationships between simulation objects.
Blend Factor
Blend Solver
Bullet Data

Attaches the appropriate data for Bullet Objects to an object.
Bullet Solver

Sets and configures an Bullet Dynamics solver.
Buoyancy Force

Applies a uniform force to objects submerged in a fluid.
Cloth Attach Constraint

Constrains a set of points on a cloth object to the surface of a Static Object.
Cloth Configure Object

Attaches the appropriate data for Cloth Objects to an object.
Cloth Mass Properties

Defines the mass properties.
Cloth Material

Defines the physical material for a deformable surface.
Cloth Material Behavior

Defines the internal cloth forces.
Cloth Object

Creates a Cloth Object from SOP Geometry.
Cloth Object

Creates a Cloth Object from SOP Geometry.
Cloth Plasticity Properties

Defines the plasticity properties.
Cloth Stitch Constraint

Constrains part of the boundary of a cloth object to the boundary of another cloth object.
Cloth Target Properties

Defines how cloth uses target.
Cloth Visualization
Cloth/Volume Collider

Defines a way of resolving collisions involving a cloth object and DOPs objects with volumetric representations (RBD Objects, ground planes, etc.)
Collide Relationship
Collider Label
Cone Twist Constraint

Constrains an object to remain a certain distance from the constraint, and limits the object’s rotation.
Cone Twist Constraint Relationship
Constraint
Constraint Network

Constrains pairs of RBD objects together according to a polygon network.
Constraint Network Relationship

Defines a set of constraints based on geometry.
Constraint Network Visualization

Visualizes the constraints defined by constraint network geometry.
Constraint Relationship
Container
Copy Data

Creates multiple copies of the input data.
Copy Data Solver

Sets and configures a Copy Data Solver.
Copy Object Information

Mimics the information set by the Copy Object DOP.
Copy Objects
Crowd Fuzzy Logic

Defines a Crowd Fuzzy Logic
Crowd Object

Creates a crowd object with required agent attributes to be used in the crowd simulation.
Crowd Solver

Updates agents according to their steer forces and animation clips.
Crowd Solver

Update crowd agents based on the custom steerforces and adjusting animation playback of clips
Crowd State

Defines a Crowd State
Crowd State

Defines a Crowd State.
Crowd Transition

Defines a transition between crowd states.
Crowd Transition

Defines a transition between crowd states.
Crowd Trigger

Defines a Crowd Trigger
Crowd Trigger

Defines a Crowd Trigger
Crowd Trigger Logic

Combines multiple crowd triggers to build a more complex trigger.
Data Only Once

Adds a data only once to an object, regardless of number of wires.
Delete

Deletes both objects and data according to patterns.
Drag Force

Applies force and torque to objects that resists their current direction of motion.
Drag Properties

Defines how the surrounding medium affects a soft body object.
Embedding Properties

Controls Embedded Geometry that can be deformed along with the simulated geometry in a finite element simulation.
Empty Data

Creates an Empty Data for holding custom information.
Empty Object

Creates an Empty Object.
Empty Relationship
Enable Solver
FLIP Configure Object

Attaches the appropriate data for Particle Fluid Objects to become a FLIP based fluid.
FLIP Solver

Evolves an object as a FLIP fluid object.
FLIP fluid object
Fan Force

Applies forces on the objects as if a cone-shaped fan were acting on them.
Fetch Data

Fetches a piece of data from a simulation object.
Field Force

Applies forces to an object using some piece of geometry as a vector field.
Filament Object

Creates a vortex filament object from SOP Geometry.
Filament Solver

Evolves vortex filament geometry over time.
File

Saves and loads simulation objects to external files.
File Data
Finite Element Fuse Constraint

Constrains points of a solid object or a hybrid object to points of another DOP object.
Finite Element Output Attributes

Allows a finite-element object to generate optional output attributes.
Finite Element Region Constraint

Constrains regions of a solid object or a hybrid object to another solid or hybrid object.
Finite Element Solver

Sets and configures a Finite Element solver.
Fluid Configure Object

Attaches the appropriate data for Fluid Objects to an object.
Fluid Force

Applies forces to resist the current motion of soft body objects relative to a fluid.
Fluid Object

Attaches the appropriate data for Fluid Objects to an object.
Fluid Solver

A solver for Sign Distance Field (SDF) liquid simulations.
Gas Adjust Coordinate System

A microsolver that adjusts an internal coordinate system attached to fluid particles in a particle fluid simulation.
Gas Adjust Elasticity

A microsolver that adjusts the strength of elastic bonds between pairs of particles in a fluid simulation.
Gas Advect

A microsolver that advects fields and geometry by a velocity field.
Gas Advect CL

A microsolver that advects fields and geometry by a velocity field using OpenCL acceleration.
Gas Advect Field

A microsolver that advects fields and geometry by a velocity field.
Gas Analysis

A microsolver that computes analytic property of fields.
Gas Attribute Swap

A microsolver that swaps geometry attributes.
Gas Blend Density

A microsolver that blends the density of two fields.
Gas Blur

A microsolver that blurs fields.
Gas Build Collision Mask

A microsolver that determines the collision field between the fluid field and any affector objects.
Gas Build Relationship Mask

A microsolver that builds a mask for each voxel to show the presence or absence of relationships between objects.
Gas Buoyancy

A microsolver that calculates an adhoc buoyancy force and updates a velocity field.
Gas Burn Geometry

Sets the object to use the Gas Burn solver.
Gas Burn Geometry Object

Creates an object with appropriate data to use as a fire source.
Gas Calculate

A microsolver that performs general calculations on a pair of fields.
Gas Collision Detect

A microsolver that detects collisions between particles and geometry.
Gas Combustion

A microsolver that applies a combustion model to the simulation.
Gas Compute Particle Attributes

A microsolver that calculates particle fluid attribute values for each particle in a particle fluid field.
Gas Correct By Markers

A microsolver that adjusts an SDF according to surface markers.
Gas Cross

A microsolver that computes the cross product of two vector fields.
Gas Curve Force

A DOP node that creates forces generated from a curve.
Gas DSD

A microsolver that applies one round detontation shock dyanamics.
Gas DSD Configure Object

Attaches the appropriate data for Smoke Objects to become a flame front based fire.
Gas DSD Solver

A microsolver that applies the flamefront-based fire simulation.
Gas Damp

A microsolver that scales down velocity, damping motion.
Gas Diffuse

A microsolver that diffuses a field or point attribute.
Gas Dissipate

A microsolver that dissipates a field.
Gas Disturb Field CL

Adds detail at a certain scale by applying "disturbance" forces to a scalar or vector field.
Gas Disturbance

Adds detail at a certain scale by applying "disturbance" forces to a scalar or vector field.
Gas Each Data Solver

A microsolver that runs once for each matching data.
Gas Elasticity

A microsolver that computes pairwise elastic forces between particles in a fluid simulation.
Gas Embed Fluid

A microsolver that embeds one fluid inside another.
Gas Enforce Boundary

A microsolver that enforces boundary conditions on a field.
Gas Equalize Density

A microsolver that equalizes the density of two fields.
Gas Equalize Volume

A microsolver that equalizes the volume of two fields.
Gas External Forces

A microsolver that evaluates the external DOPs forces for each point in a velocity field and updates the velocity field accordingly.
Gas Extrapolate

A microsolver that extrapolates a field’s value along an SDF.
Gas Feather Field

A microsolver that creates a feathered mask out of a field.
Gas Feedback

A microsolver that calculates and applies feedback forces to collision geometry.
Gas Fetch Fields to Embed

A data node that fetches the fields needed to embed one fluid in another.
Gas Field VOP

Runs CVEX on a set of fields.
Gas Field Wrangle

Runs CVEX on a set of fields.
Gas Field to Particle

A microsolver that copies the values of a field into a point attribute on geometry.
Gas Geometry Defragment

A microsolver that defragments geometry.
Gas Geometry to SDF

A microsolver that creates a signed distance field out of geometry.
Gas Guiding Volume

Blends a set of SOP volumes into a set of new collision fields for the creation of a guided simulation.
Gas Impact to Attributes

A microsolver that copies Impact data onto point attributes.
Gas Integrator

A microsolver that applies forces to a particle fluid system.
Gas Intermittent Solve

A microsolver that solves its subsolvers at a regular interval.
Gas Limit

A microsolver that clamps a field within certain values.
Gas Limit Particles

A microsolver that keeps particles within a box.
Gas Linear Combination

A microsolver that combines multiple fields or attributes together.
Gas Local Sharpen

A microsolver that adaptively sharpens a field.
Gas Lookup

A microsolver that looksup field values according to a position field.
Gas Match Field

A microsolver that rebuilds fields to match in size and resolution to a reference field.
Gas Mist Solver

A microsolver that passively moves particles by a velocity field.
Gas Net Fetch Data

A microsolver that arbitrary simulation data between multiple machines.
Gas Net Field Border Exchange

A microsolver that exchanges boundary data between multiple machines.
Gas Net Slice Balance

A microsolver that balances slices data between multiple machines.
Gas Net Slice Exchange

A microsolver that exchanges boundary data between multiple machines.
Gas OpenCL

Executes the provided kernel with the given paramters
Gas Particle Count

A microsolver that counts the number of particles in each voxel of a field.
Gas Particle Forces

A microsolver that computes pairwise collision forces between particles that represent instanced spheres.
Gas Particle Move to Iso

A microsolver that moves particles to lie along a certain isosurface of an SDF.
Gas Particle Neighbour Update

Updates a neighbourhood list for Geometry to match moved points.
Gas Particle Pressure

A microsolver that computes pairwise fluid pressure forces between particles in a fluid simulation.
Gas Particle Separate

A microsolver that separates adjacent particles by adjusting their point positions..
Gas Particle to Field

A microsolver that copies a particle system’s point attribute into a field.
Gas Particle to SDF

A microsolver that converts a particle system into a signed distance field.
Gas Project Non Divergent

A microsolver that removes the divergent components of a velocity field.
Gas Project Non Divergent Multigrid

A microsolver that removes the divergent components of a velocity field using a multi-grid method.
Gas Project Non Divergent Variational

A microsolver that removes the divergent components of a velocity field.
Gas Reduce

A microsolver that reduces a field to a single constant field .
Gas Reduce Local

A microsolver that reduces surrounding voxels to a single value.
Gas Reinitialize SDF

A microsolver that reinitializes a signed distance field while preserving the zero isocontour.
Gas Repeat Solver

A microsolver that repeatedly solves its input.
Gas Resize Field

A microsolver that changes the size of fields.
Gas Resize Fluid Dynamic

A microsolver that resizes a fluid to match simulating fluid bounds
Gas Rest

A microsolver that initializes a rest field.
Gas SDF to Fog

A microsolver that converts an SDF field to a Fog field.
Gas SPH Density

A microsolver that calculates the density at particle positions in a particle field using techniques from Smoothed Particle Hydrodynamics.
Gas SPH Forces

A microsolver that uses techniques from Smoothed Particle Hydrodynamics to compute pressure, viscosity and surface tension forces acting between particles in a fluid simulation.
Gas Sand Forces

A microsolver that computes the forces to treat the fluid simulation as sand rather than fluid.
Gas Seed Markers

A microsolver that seeds marker particles around the boundary of a surface.
Gas Seed Particles

A microsolver that seeds particles uniformly inside a surface.
Gas Shred

Applies a Shredding Force to the velocity field specified.
Gas Slice To Index Field

A microsolver that computes slice numbers into an index field.
Gas Stick on Collision

Adjusts a fluid velocity field to match collision velocities.
Gas Strain Forces

A microsolver that calculates the forces imparted by a strain field.
Gas Strain Integrate

A microsolver that updates the strain field according to the current velocity field.
Gas SubStep

A microsolver that substeps input microsolvers.
Gas Surface Snap

A microsolver that snaps a surface onto a collision surface.
Gas Surface Tension

A microsolver that calculates a surface tension force proportional to the curvature of the surface field.
Gas Target Force

A microsolver that applies a force towards a target object.
Gas Temperature Update

Modifies the temperature of a FLIP over time.
Gas Turbulence

Applies Turbulence to the specified velocity field.
Gas Up Res

Up-scales and/or modifies a smoke, fire, or liquid simulations.
Gas Velocity Stretch

A microsolver that reorients geometry according to motion of a velocity field.
Gas Viscosity

A microsolver that applies viscosity to a velocity field.
Gas Volume

A microsolver that seeds flip particles into a new volume region.
Gas Volume Ramp

Remaps a field according to a ramp.
Gas Vortex Boost

Applies a confinement force on specific bands of sampled energy.
Gas Vortex Confinement

Applies a vortex confinement force to a velocity field.
Gas Vortex Equalizer

Applies a confinement force on specific bands of sampled energy.
Gas Vorticle Forces

A microsolver that applies forces to a velocity field or geometry according to vorticle geometry.
Gas Vorticle Geometry

A DOP node that adds the appropriately formatted data to represent vorticles.
Gas Vorticle Recycle

A DOP node that recycles vorticles by moving them to the opposite side of the fluid box when they leave.
Gas Wavelets

A microsolver that performs a wavelet decomposition of a field.
Gas Wind

A microsolver that applies a wind force.
Geometry Copy
Geometry VOP

Runs CVEX on geometry attributes.
Geometry Wrangle

Runs a VEX snippet to modify attribute values.
Glue Constraint Relationship
Gravity Force

Applies a gravity-like force to objects.
Ground Plane

Creates a ground plane suitable for RBD or cloth simulations.
Group

Creates simulation object groups.
Group Relationship
Hard Constraint Relationship

Defines a constraint relationship that must always be satisfied.
Hybrid Configure Object

Attaches the appropriate data for Hybrid Objects to an object.
Hybrid Object

Creates a Hybrid Object from SOP Geometry.
Impact Analysis

Stores filtered information about impacts on an RBD object.
Impulse Force

Applies an impulse to an object.
Index Field

Creates an index field.
Index Field Visualization

Visualizes an index field.
Instanced Object

Creates DOP Objects according to instance attributes
Intangible Value

Marks a simulation object as intangible or tangible.
Link to Source Object

Stores the name of the scene level object source for this DOP object.
Magnet Force

Apply forces on objects using a force field defined by metaballs.
Mask Field
Matrix Field

Creates a matrix field.
Matrix Field Visualization

Visualizes a matrix field.
Merge

Merges multiple streams of objects or data into a single stream.
Modify Data

Modifies or creates options on arbitrary data.
Motion

Defines an object’s position, orientation, linear velocity, and angular velocity.
Multi Field Visualization

Unified visualization of multiple fields.
Multiple Solver
Net Fetch Data

A DOP that transfers arbitrary simulation data between multiple machines.
No Collider
No Constraint Relationship
Noise Field
Null

Does nothing.
OBJ Position

Creates position information from an object’s transform.
Output

Serves as the end-point of the simulation network. Has controls for writing out sim files.
POP Advect by Filaments

Uses vortex filaments to move particles.
POP Advect by Volumes

A POP node that uses velocity volumes to move particles.
POP Attract

A POP node that attracts particles to positions and geometry.
POP Attribute from Volume

A POP node that copies volume values into a particle attribute.
POP Awaken

A POP node that resets the stopped attribute on particles, waking them up.
POP Axis Force

A POP node that applies a force around an axis.
POP Collision Behavior

A POP node that reacts to collisions.
POP Collision Detect

A POP node that detects and reacts to collisions.
POP Collision Ignore

A POP node marks particles to ignore implicit collisions.
POP Color

A POP node that colors particles.
POP Curve Force

A POP node that creates forces generated from a curve.
POP Drag

A POP node that applies drag to particles.
POP Drag Spin

A POP node that applies drag to the spin of particles.
POP Fan Cone

A POP node that applies a conical fan wind to particles.
POP Fireworks

A POP node that creates a simple fireworks system.
POP Float by Volumes

A POP node that floats particles on the surface of a liquid simulation.
POP Flock

A POP node that applies a flocking algorithm to particles.
POP Force

A POP node that applies forces to particles.
POP Grains

A POP node that applies sand grain interaction to particles.
POP Group

A POP node that groups particles.
POP Instance

A POP node that sets up the instancepath for particles.
POP Interact

A POP node that applies forces between particles.
POP Kill

A POP node that kills particles.
POP Limit

A POP node that limits particles.
POP Local Force

A POP node that applies forces within the particle’s frame.
POP Location

A POP solver that generates particles at a point.
POP Lookat

A POP node makes a particle look at a point.
POP Metball Force

A POP node that applies forces according to metaballs.
POP Object

Converts a regular particle system into a dynamic object capable of interacting correctly with other objects in the DOP environment.
POP Property

A POP node that sets various common attributes on particles.
POP Proximity

A POP node that sets attributes based on nearby particles.
POP Replicate

A POP Node that generates particles from incoming particles.
POP Soft Limit

A POP node that creates a spongy boundary.
POP Solver

A POP solver updates particles according to their velocities and forces.
POP Source

A POP node that generates particles from geometry.
POP Speed Limit

A POP node that sets the speed limits for particles.
POP Spin

A POP node that sets the spin of particles..
POP Spin by Volumes

A POP node that uses the vorticity of velocity volumes to spin particles.
POP Sprite

A POP node that sets the sprite display for particles.
POP Steer Align

Applies force to agents/particles to align them with neighbors.
POP Steer Avoid

Applies anticipatory avoidance force to agents/particles to avoid potential future collisions with other agents/particles.
POP Steer Cohesion

Applies forces to agents/particles to bring them closer to their neighbors.
POP Steer Custom

Applies forces to agents/particles calulated using a VOP network.
POP Steer Obstacle

Applies force to agents/particles to avoid potential collisions with static objects.
POP Steer Obstacle

Applies force to agents/particles to avoid potential collisions with static objects.
POP Steer Path

Applies force to agents/particles according to directions from a path curve.
POP Steer Seek

Applies force to agents/particles to move them toward a target position.
POP Steer Separate

Apply force to agents/particles to move them apart from each other.
POP Steer Solver

Used internally in the crowd solver to integrate steering forces.
POP Steer Solver

Used internally in the crowd solver to integrate custom steering forces.
POP Steer Turn Constraint

Constrains agent velocity to only go in a direction within a certain angle range of its current heading, to prevent agents from floating backward.
POP Steer Wander

Apply forces to agents/particles to create a random motion.
POP Stream

A POP node that creates a new stream of particles.
POP Torque

A POP node that applies torque to particles, causing them to spin.
POP VOP

Runs CVEX on a particle system.
POP Velocity

A POP node that directly changes the velocity of particles.
POP Wind

A POP node that applies wind to particles.
POP Wrangle

Runs a VEX snippet to modify particles.
Particle Fluid Configure Object

Attaches the appropriate data for Particle Fluid Objects to an object.
Particle Fluid Emitter

Emits particles into a particle fluid simulation.
Particle Fluid Object

Creates a Particle Fluid Object from SOP Geometry.
Particle Fluid Solver

Evolves an object as a particle fluid object.
Particle Fluid Visualization

Visualizes particles.
Partition

Creates simulation object groups based on an expression.
Physical Parameters

Defines the base physical parameters of DOP objects.
Point Collider
Point Force

Applies a force to an object from a particular location in space.
Point Position

Creates position information from a point on some SOP geometry.
Position

Associates a position and orientation to an object.
Pump Relationship
Pyro Solver

Sets and configures a Pyro solver. This solver can be used to create both fire and smoke.
RBD Angular Constraint

Constrains an RBD object to a certain orientation.
RBD Angular Spring Constraint

Constrains an RBD object to have a certain orientation, but with a set amount of springiness.
RBD Auto Freeze

Automatically freezes RBD Objects that have come to rest
RBD Configure Object

Attaches the appropriate data for RBD Objects to an object.
RBD Fractured Object

Creates a number of RBD Objects from SOP Geometry. These individual RBD Objects are created from the geometry name attributes.
RBD Hinge Constraint

Constrains an object to two constraints, creating a rotation similar to a hinge or a trapeze bar.
RBD Keyframe Active
RBD Object

Creates an RBD Object from SOP Geometry.
RBD Packed Object

Creates a single DOP object from SOP Geometry that represents a number of RBD Objects.
RBD Pin Constraint

Constrains an RBD object a certain distance from the constraint.
RBD Point Object

Creates a simulation object at each point of some source geometry, similarly to how the Copy surface node copies geometry onto points.
RBD Solver

Sets and configures a Rigid Body Dynamics solver.
RBD Spring Constraint

Constrains an object to remain a certain distance from the constraint, with a set amount of springiness.
RBD State

Alters the state information for an RBD Object.
RBD Visualization
ROP Output Driver

Saves the state of a DOP network simulation into files.
Reference Frame Force

Applies forces to an object according to the difference between two reference frames.
Rendering Parameters Volatile
Rigid Body Solver

Sets and configures a Rigid Body Dynamics solver.
Ripple Configure Object

Attaches the appropriate data for Ripple Objects to an object.
Ripple Object

Creates an object from existing geometry that will be deformed with the ripple solver.
Ripple Solver

Animates wave propagation across Ripple Objects.
SDF Representation

Creates a signed distance field representation of a piece of geometry that can be used for collision detection.
SOP Geometry
SOP Guide
SOP Scalar Field

Creates a scalar field from a SOP Volume.
SOP Solver
SOP Vector Field

Creates a vector field from a SOP Volume Primitive.
Scalar Field

Creates a scalar field.
Scalar Field Visualization

Visualizes a scalar field.
Script Solver
Seam Properties

Defines the internal seam angle.
Shell Mass Properties

Defines the mass density of a Cloth Object.
Sink Relationship
Slice Along Line

Divides a particle system uniformly into multiple slices along a line.
Slice by Plane

Specifies a cutting plane to divide a particle system into two slices for distributed simulations.
Slider Constraint

Constrains an object to rotate and translate on a single axis, and limits the rotation and translation on that axis.
Slider Constraint Relationship
Smoke Configure Object

Attaches the appropriate data for Smoke Objects to an object.
Smoke Object

Creates an Smoke Object from SOP Geometry.
Smoke Solver

Sets and configures a Smoke solver. This is a slightly lower-level solver that is the basis for the Pyro solver.
Soft Attach Constraint Relationship
Soft Body (SBD) Constraint

Constrains a set of points on a soft body object to a certain position using a hard constraint or soft constraint.
Soft Body (SBD) Pin Constraint

Constrains a point on a soft body object to a certain position.
Soft Body (SBD) Spring Constraint

Constrains a point on a soft body to a certain position, with a set amount of springiness.
Soft Body Collision Properties

Defines how a soft body object responds to collisions.
Soft Body Fracture Properties

Defines how a Soft Body Object responds to collisions.
Soft Body Fracture Properties

Defines how a Soft Body Object responds to collisions.
Soft Body Material Properties

Defines how a Soft Body Object responds to collisions.
Soft Body Rest Properties

Allows the user to import the rest state from a SOP node.
Soft Body Solver

Sets and configures a Soft Body solver.
Soft Body Target Properties

Defines the strengths of the soft constraint on a soft body object.
Solid Aniso Multiplier

Controls the anisotropic behavior of a Solid Object.
Solid Configure Object

Attaches the appropriate data for Solid Objects to an object.
Solid Mass Properties

Defines the mass density of a Solid Object.
Solid Model Data

Defines how a Solid Object reacts to strain and change of volume.
Solid Object

Creates a simulated Finite Element solid from geometry.
Solid Object

Creates a Solid Object from SOP Geometry.
Solid Solver
Solid Visualization
Source Filaments

Imports vortex filaments from a SOP network.
Source Relationship
Source Volume

A microsolver that imports and directly applies SOP volume data.
Sphere Edge Tree

This builds a tree of spheres producing bounding information for an edge cloud.
Sphere Point Tree

This builds a tree of spheres producing bounding information for a point cloud.
Split Object

Splits an incoming object stream into as many as four output streams.
Spring Constraint Relationship
Static Object

Creates a Static Object from SOP Geometry.
Static Solver
Static Visualization

Allows you to inspect the behavior of a static object in the viewport.
Subnetwork
Surface Collision Parameters

Control the thickness of the object that collides with cloth.
Switch

Passes one of the input object or data streams to the output.
Switch Solver
Switch Value
Target Constraint

Constrains a soft body object to a target trajectory using a hard constraint or soft constraint.
Target Relationship
Terrain Object

Creates a Terrain Object from SOP Geometry.
Thin Plate/Thin Plate Collider

Defines a way of resolving collisions between two rigid bodies.
Two State Constraint Relationship
Uniform Force

Applies a uniform force and torque to objects.
VOP Force

Applies forces on the objects according to a VOP network.
Vector Field

Creates a vector field.
Vector Field Visualization

Visualizes a vector field.
Velocity Impulse Force

Applies an impulse to an object.
Visualize Geometry

A microsolver to create soft references to visualizers on itself.
Volume/Volume Collider

Defines a way of resolving collisions involving two rigid bodies with volume.
Voronoi Fracture Configure Object

Attaches the appropriate data to make an object fractureable by the Voronoi Fracture Solver
Voronoi Fracture Parameters

Defines the parameters for dynamic fracturing using the Voronoi Fracture Solver
Voronoi Fracture Solver

Dynamically fractures objects based on data from the Voronoi Fracture Configure Object DOP
Vortex Force

Applies a vortex-like force on objects, causing them to orbit about an axis along a circular path.
Whitewater Emitter

A POP solver that generates particles for the Whitewater Solver.
Whitewater Object

Creates a Whitewater Object that holds data for a whitewater simulation.
Whitewater Solver

Sets and configures a Whitewater solver.
Wind Force

Applies forces to resist the current motion of objects relative to a turbulent wind.
Wire Angular Constraint

Constrains a wire point’s orientation to a certain direction.
Wire Angular Spring Constraint

Constrains a wire point’s orientation to a certain direction, with a set amount of springiness.
Wire Configure Object

Attaches the appropriate data for Wire Objects to an object.
Wire Elasticity

Defines the elasticity of a wire object.
Wire Glue Constraint

Constraints a wire point to a certain position and direction.
Wire Object

Creates a Wire Object from SOP Geometry.
Wire Physical Parameters

Defines the physical parameters of a wire object.
Wire Plasticity

Defines the plasticity of a wire object.
Wire Solver

Sets and configures a Wire solver.
Wire Visualization
Wire/Volume Collider

Defines a way of resolving collisions involving a wire object and DOPs objects with volumetric representations.
Wire/Wire Collider

Defines a way of resolving collisions between two wires.
clothsolver
clothsolver-
finiteelementsolver