Execution

This class contains nodes for a wide variety of applications. With these nodes it is, for example, possible to

create loops
add helper nodes for cleaner graphs
purge the memory allocated by a graph
change the number of threads used for the execution of a graph
print out information to RealFlow's "Messages" window

Some of the "Execution" nodes have certain requirements and we recommend reading "RealFlow's Graphs Guide". There we have prepared a dedicated chapter explaining how to use these nodes.

Nodes

Name	Description
CommandParameterInfo	This node returns the list of parameter names and types of the input command.
Compound	This node acts as a container of a subgraph. Thus, an additional layer of abstraction is provided.
CompoundInterface	This node acts as an interface between a compound and its containing graphs.
Concentrator	This node acts as a passthrough node for as many inputs as desired. However, ALL inputs are ALWAYS evaluated. Evaluation order of the inputs is top to bottom.Take care, that all outputs have an associated input to avoid evaluation time errors.
DateTimeFromSeconds	This node converts a value in seconds since epoch to every one of its human readable components.
Evaluator	The Evaluator node is the terminal node that determines which nodes are actually evaluated at graph execution.
ExecuteCommand	This node executes all the commands with the input Class IDs sequentially.
For	The For node is a special node that can be used to perform graph iterations.
GetAllGlobalVariableNames	This node returns all names of actual defined global variables. The result is stored for every allowed type separately.
GetCurrentDateTime	This node returns the current computer local time.
GetGraphNumberOfThreads	This node returns the number of threads used for the excecution of the current compound and its children.
GraphCancel	This node evaluates its input 'in' and then stops the execution of the current graph if the input 'condition' is 'true'.
GraphInterface	This node acts as an interface between a graph and the rest of RealFlow.
GraphPurgeMemory	This node clears the memory, messages and timing data stored in the current graph scene nodes and pins.
HasCommand	This node checks if there are commands in RealFlow with the given Class ID.
Kernel	The Kernel node is a special node that can be used to perform graph iterations in parallel.
MemoryUsageInfo	This node outputs the memory usage in kilobytes for the current state of the graph.
MessagePrint	This node prints a standard RealFlow message in the MessageWindow, using a string representation of the provided input 'value'.
NodePurgeMemory	This node purges the data stored in the owner of the connected 'input' pin.Nodes that allocate big data structures (like all the Copy nodes) store their data inside the node.
Pass	This node acts as a passthrough node. The output value is exactly the same as the input. No copy is performed.
PinPurgeMemory	This node purges the data stored in the connected 'input' pin.Basic types (like Integer or String) store their values in the pins.
PinSignature	Computes the MD5 signature of the input data.
PythonCodeExecute	This node executes the input Python source code, but does not return any value.
Selector	This node allows the user to freely connect its passthrough inputs to its passthrough outputs. Keep in mind that all outputs should have an associated input to avoid evaluation time errors.
SetGraphNumberOfThreads	This node changes the number of threads used for the current compound and its children behind this nodes evaluation.
Sleep	This node freezes the graph evaluation for the input 'milisecs' amount of time in miliseconds.

CommandParameterInfo

This node returns the list of parameter names and types of the input command.

Inputs

Name	Types	PassThrough	Description
class id	Integer64 (1)		The Class ID of the command to be checked

Outputs

Name	Types	PassThrough	Description
parameter names	String		The names of the parameters that belong to the input command
parameter types	String		The parameter types

Compound

This node acts as a container of a subgraph. Thus, an additional layer of abstraction is provided.

The Compound node allows the creation of dynamic input/output pins with used-defined names.

If a pin is added to the Compound, an equivalent interface node is created within the contained graph.

CompoundInterface

This node acts as an interface between a compound and its containing graphs.

The CompoundInterface node allows the creation of dynamic input/output pins with user-defined names.

If a pin is added to the CompoundInterface node, a pin with the same name is created in its parent compound.

When a pin is added to the Compound, an equivalent interface node is created in its contained graph.

Concentrator

This node acts as a passthrough node for as many inputs as desired. However, ALL inputs are ALWAYS evaluated. Evaluation order of the inputs is top to bottom.Take care, that all outputs have an associated input to avoid evaluation time errors.

Inputs

Name	Types	PassThrough	Description
in	PassThrough	Optional out	The in

Outputs

Name	Types	PassThrough	Description
out	PassThrough	Optional in	The out

DateTimeFromSeconds

This node converts a value in seconds since epoch to every one of its human readable components.

Inputs

Name	Types	PassThrough	Description
total seconds	Integer64	through	The total number of seconds since epoch to convert

Outputs

Name	Types	PassThrough	Description
year	Integer		The year number in four digit format
month	Integer		The month number
day	Integer		The month day
hour	Integer		The hour in local time
minute	Integer		The minute in local time
second	Integer		The second in local time
gmt	Integer		The local GMT offset
through	PassThrough	total seconds	The input 'total seconds'

Evaluator

The Evaluator node is the terminal node that determines which nodes are actually evaluated at graph execution.

At graph execution, every Evaluator node pin computes the chain of nodes connected to it and executes them in the proper order.

This node accepts the creation of dynamic input/output pins with used-defined names.

Take note that Evaluator nodes can only be located at the root level.

Inputs

Name	Types	PassThrough	Description
evaluate	Evaluate Integer Integer64 Real Double Bit Edit Static Browse Color4 List Button CButton Vector3 Matrix4 Quaternion ObjectSelector Mesh DistanceField FilePath Folder String Image Directory Particles GraphParticle Box Daemon Object StandardEmitter ParticleLegacyMesh ParticleMesh ParticleMesh_VDB HybridoMesh HybridoMesh_VDB Camera HybridoDomain HybridoEmitter HybridoMist MultiBody MultiJoint MultiServo MultiServoPosLinear MultiServoPosAngular MultiServoVelLinear MultiServoVelAngular IDOC HybridoSplash HybridoFoam HybridoBubbles HybridoBubblesAndFoam HybridoWet HybridoWaterLine HybridoSplashAndFoam HybridoWetAndFoam DyversoDomain DyversoEmitter SplineNode RealFlowGroup RealFlowNode ObjectMesh RealWaveMesh Vertices Faces GridFluidDomainParticles GridFluidDomainParticle StandardParticles StandardParticle Condition Vector3Field ParameterType Curve Key MeshVoxelization Evaluate RealField ParticleVoxelization MaskField Spline ColorGradient		The evaluate

ExecuteCommand

This node executes all the commands with the input Class IDs sequentially.

Inputs

Name

Types

PassThrough

Description

class id

Integer64

The Class ID of the command to be executed.

Keep in mind that most built-in commands are not created when RealFlow is launched on command line mode

in

PassThrough

through

The in

Outputs

Name	Types	PassThrough	Description
through	PassThrough	in	The input 'in'

For

The For node is a special node that can be used to perform graph iterations.

A For node must always be inside a Compound node. It cannot be located at the root level.

Nodes - at the same level as the For node - are evaluated as many times as the For condition requires. Thus, a node depending on the For 'currentIndex' output is evaluated for each iteration. If it is connected several times to an evaluator node, it is evaluated accordingly repetitively. This is a limitation yet to be solved.Only one single For node is allowed at the same graph level. Nested For iterations can be performed using nested Compounds, each containing a separate For node.

Inputs

Name	Types	Description
start	Integer (1)	The start
stop	Integer (1)	The stop
step	Integer (1)	The step

Outputs

Name	Types	PassThrough	Description
current index	Integer		The current index

GetAllGlobalVariableNames

This node returns all names of actual defined global variables. The result is stored for every allowed type separately.

Outputs

Name	Types	Description
bit names	String	The bit names
box names	String	The box names
distance field names	String	The distance field names
image names	String	The image names
mesh names	String	The mesh names
mesh voxelization names	String	The mesh voxelization names
particle voxelization names	String	The particle voxelization names
num names	String	The num names
scene node names	String	The scene node names
string names	String	The string names
vector3 field names	String	The vector3 field names
graph particles names	String	The graph particles names
real field names	String	The real field names
spline names	String	The spline names
key names	String	The key names
curve names	String	The curve names

GetCurrentDateTime

This node returns the current computer local time.

Inputs

Name	Types	PassThrough	Description
in	PassThrough	through	The in

Outputs

Name	Types	PassThrough	Description
year	Integer		The current year number in four digit format
month	Integer		The current month number
day	Integer		The current month day
hour	Integer		The current hour in local time
minute	Integer		The current minute in local time
second	Integer		The current second in local time
gmt	Integer		The local GMT offset
total seconds	Integer64		The current total number of seconds since epoch in local time
through	PassThrough	in	The input 'in'

GetGraphNumberOfThreads

This node returns the number of threads used for the excecution of the current compound and its children.

Inputs

Name	Types	PassThrough	Description
in	PassThrough	through	The in

Outputs

Name	Types	PassThrough	Description
threads	Integer		The current number of threads. 0 for default
actual threads	Integer		The actual current number of threads
through	PassThrough	in	The input 'in'

GraphCancel

This node evaluates its input 'in' and then stops the execution of the current graph if the input 'condition' is 'true'.

Inputs

Name	Types	PassThrough	Description
cancel	Bit (1)		The cancel
quiet	Bit (1)		Set to 'true' to cancel graph execution without showing any error
in	PassThrough	through	The in

Outputs

Name	Types	PassThrough	Description
through	PassThrough	in	The input 'in'

GraphInterface

This node acts as an interface between a graph and the rest of RealFlow.

The Graph Interface node allows the creation of dynamic output pins with user-defined names and types.

GraphPurgeMemory

This node clears the memory, messages and timing data stored in the current graph scene nodes and pins.

Inputs

Name	Types	PassThrough	Description
in	PassThrough	through	The in

Outputs

Name	Types	PassThrough	Description
through	PassThrough	in	The input 'in'

HasCommand

This node checks if there are commands in RealFlow with the given Class ID.

Inputs

Name	Types	PassThrough	Description
class id	Integer64		The Class ID of the command to be checked

Outputs

Name	Types	PassThrough	Description
mask	Bit		The mask

Kernel

The Kernel node is a special node that can be used to perform graph iterations in parallel.

If the start value is larger than the stop value, the kernel is not executed (except, if the stop value is negative).

A Kernel node must always be inside a Compound node. It cannot be created at root level.

Inputs

Name	Types	Description
array	Numeric Integer Integer64 Real Vector3 Color4 Quaternion Matrix4	The array
threads	Integer (1)	The threads
start	Integer (1)	The index of the first element of the input to apply the kernel to. If negative, the array is processed from the first value
stop	Integer (1)	The index of the last element of the input to apply the kernel to. If negative, the array is processed up to the last element

Outputs

Name	Types	Description
element	Numeric Integer Integer64 Real Vector3 Color4 Quaternion Matrix4	The element
thread id	Integer	The thread id
index	Integer	The index

MemoryUsageInfo

This node outputs the memory usage in kilobytes for the current state of the graph.

Inputs

Name	Types	PassThrough	Description
in	PassThrough	through	The pin to query the memory usage from

Outputs

Name	Types	PassThrough	Description
pin kb	Real		Memory usage in kilobytes for the pin connected to 'input'
node kb	Real		Memory usage in kilobytes for the node which owns the pin connected to 'input'
graph kb	Real		Memory usage in kilobytes for the whole current graph
through	PassThrough	in	The input 'in'

MessagePrint

This node prints a standard RealFlow message in the MessageWindow, using a string representation of the provided input 'value'.

Inputs

Name	Types	PassThrough	Description
value	All	through	The value

Outputs

Name	Types	PassThrough	Description
through	PassThrough	value	The input 'value'

NodePurgeMemory

This node purges the data stored in the owner of the connected 'input' pin.Nodes that allocate big data structures (like all the Copy nodes) store their data inside the node.

Inputs

Name	Types	PassThrough	Description
in	PassThrough	through	The in

Outputs

Name	Types	PassThrough	Description
through	PassThrough	in	The input 'in'

Pass

This node acts as a passthrough node. The output value is exactly the same as the input. No copy is performed.

A common use of Pass nodes is the reduction of graph cluttering.

Inputs

Name	Types	PassThrough	Description
in	PassThrough	through	The in

Outputs

Name	Types	PassThrough	Description
through	PassThrough	in	The input 'in'

PinPurgeMemory

This node purges the data stored in the connected 'input' pin.Basic types (like Integer or String) store their values in the pins.

Inputs

Name	Types	PassThrough	Description
in	PassThrough	through	The in

Outputs

Name	Types	PassThrough	Description
through	PassThrough	in	The input 'in'

PinSignature

Computes the MD5 signature of the input data.

Basic types return a single value (except String values). Complex types return as many signatures as the input array size.

If something is wrong, the signature is 0xffffffffffffffffffffffffffffffff.

Inputs

Name	Types	PassThrough	Description
in	PassThrough	through	The in

Outputs

Name	Types	PassThrough	Description
signature	String		The signature of the input data
through	PassThrough	in	The input 'in'

PythonCodeExecute

This node executes the input Python source code, but does not return any value.

Inputs

Name	Types	PassThrough	Description
code	String (1)		The Python source code to be executed
in	PassThrough	through	The in

Outputs

Name	Types	PassThrough	Description
through	PassThrough	in	The input 'in'

Selector

This node allows the user to freely connect its passthrough inputs to its passthrough outputs. Keep in mind that all outputs should have an associated input to avoid evaluation time errors.

Inputs

Name	Types	PassThrough	Description
in	PassThrough	Optional out	The in

Outputs

Name	Types	PassThrough	Description
out	PassThrough	Optional in	The out

SetGraphNumberOfThreads

This node changes the number of threads used for the current compound and its children behind this nodes evaluation.

Inputs

Name	Types	PassThrough	Description
threads	Integer (1)		The desired number of threads. 0 for default
in	PassThrough	through	The in

Outputs

Name	Types	PassThrough	Description
through	PassThrough	in	The input 'in'

Sleep

This node freezes the graph evaluation for the input 'milisecs' amount of time in miliseconds.

Inputs

Name	Types	PassThrough	Description
milisecs	Integer		The miliseconds to sleep
in	PassThrough	through	The in

Outputs

Name	Types	PassThrough	Description
through	PassThrough	in	The input 'in'