NodeController#

class omni.graph.core.NodeController(*args, **kwargs)#

Bases: object

Helper class that provides a simple interface to modifying the contents of a node

Methods

__init__(*args, **kwargs)

Initializes the class with a particular configuration.

create_attribute(*args, **kwargs)

Create a new dynamic attribute on the node

promote_attribute(*args, **kwargs)

Promotes an attribute on a node in a compound graph, making it accessable to the parenting compound node.

remove_attribute(*args, **kwargs)

Removes an existing dynamic attribute from a node.

safe_node_name(node_type_name[, abbreviated])

Returns a USD-safe node name derived from the node_type_name
__init__(*args, **kwargs)#

Initializes the class with a particular configuration. The arguments are flexible so that classes can initialize only what they need for the calls they will be making. The argument is optional and there may be other arguments present that will be ignored

Parameters:

undoable (bool) – If True the operations performed with this instance of the class are to be added to the undo queue, else they are done immediately and forgotten

classmethod create_attribute(
*args,
**kwargs,
) → Attribute | None#

Create a new dynamic attribute on the node

This function can be called either from the class or using an instantiated object. The first argument is positional, being either the class or object. All others are by keyword and optional, defaulting to the value set in the constructor in the object context and the function defaults in the class context.

Parameters:

  • obj – Either cls or self depending on how the function was called

  • node – Node on which to create the attribute (path or og.Node)

  • attr_name – Name of the new attribute, either with or without the port namespace

  • attr_type – Type of the new attribute, as an OGN type string or og.Type

  • attr_port – Port type of the new attribute, default is og.AttributePortType.ATTRIBUTE_PORT_TYPE_INPUT

  • attr_default – The initial value to set on the attribute, default is None which means use the type’s default

  • attr_extended_type – The extended type of the attribute, default is og.ExtendedAttributeType.REGULAR. If the extended type is og.ExtendedAttributeType.UNION then this parameter will be a 2-tuple with the second element being a list or comma-separated string of union types

  • undoable – If True the operation is added to the undo queue, else it is done immediately and forgotten

Returns:

The newly created attribute, None if there was a problem creating it

Return type:

omni.graph.core.Attribute

classmethod promote_attribute(
*args,
**kwargs,
) → Attribute#

Promotes an attribute on a node in a compound graph, making it accessable to the parenting compound node.

This function can be called either from the class or using an instantiated object. The first argument is positional, being either the class or object. All others are by keyword and optional, defaulting to the value set in the constructor in the object context and the function defaults in the class context.

Parameters:

  • obj – Either cls or self depending on how the function was called

  • src_spec – Specification of the attribute to be promoted

  • name – The name of the promoted attribute. If not specified, the namespace prefix will be prepended based

  • src_spec. (on)

  • undoable – If True the operation is added to the undo queue, else it is done immediately and forgotten (default True)

Returns:

The attribute created on the compound node that connects to the attribute

Return type:

og.Attribute

Raises:

  • OmniGraphError – If attribute could not be found, the attribute does not belong to a compound, or the promoted

  • name already exists –

classmethod remove_attribute(*args, **kwargs) → bool#

Removes an existing dynamic attribute from a node.

This function can be called either from the class or using an instantiated object. The first argument is positional, being either the class or object. All others are by keyword and optional, defaulting to the value set in the constructor in the object context and the function defaults in the class context.

Parameters:

  • obj – Either cls or self depending on how the function was called

  • attribute – Reference to the attribute to be removed

  • node – If the attribute reference is a string the node is used to find the attribute to be removed

  • undoable – If True the operation is added to the undo queue, else it is done immediately and forgotten

Raises:

OmniGraphError – if the attribute was not found or could not be removed

classmethod safe_node_name(
node_type_name: str,
abbreviated: bool = False,
) → str#

Returns a USD-safe node name derived from the node_type_name

Parameters:

  • node_type_name – Fully namespaced name of the node type (e.g. omni.graph.nodes.Clamp)

  • abbreviated – If True then remove the namespace, else just make the separators into underscores

Returns:

A safe node name that roughly corresponds to the given node type name

Return type:

str

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