Amazon VERSION 2.0V1 Guía de usuario descargar pdf (Pagina 172)

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# Get root level

root = NodegraphAP.GetRootNode()

# Create a PrimitiveCreate node at root level

prim = NodegraphAPI.CreateNode( 'PrimitiveCreate', root )

# Get the root parameter of the PrimitiveCreate node

rootParam = prim.getParameters()

# Add a new User Parameter of type string

stringParam = rootParam.createChildString( "yourFilePath", "yourFile.txt" )

# Tell Katana to use the assetIdInput widget to represent this parameter

stringParam.setHintString( "{'widget': 'assetIdInput'}" )

Or, to add a User Parameter of type string, as a drop-down menu:

# Get root level

root = NodegraphAP.GetRootNode()

# Create a PrimitiveCreate node at root level

prim = NodegraphAPI.CreateNode( 'PrimitiveCreate', root )

# Get the root parameter of the PrimitiveCreate node

rootParam = prim.getParameters()

# Add a new User Parameter of type string

stringParam = rootParam.createChildString( "yourDropdown", "yourDefaultValue" )

# Tell Katana to use the pop-up widget

# and fill out the menu values

stringParam.setHintString( "{'widget':'popup',\

'options':[ 'a', 'b', 'c' ]}" )

See Widget Types for a table of the widget types seen in the UI.

Parameter Expressions

Python

A parameter can have its value computed dynamically using a Python expression. Expressions are set using

Parameter.setExpression(), which takes a Python string representing the expression as its first argument and an

optional enable parameter to specify whether to implicitly enable the expression.

A parameter expression must evaluate in the same way that a Python eval expression would (as a condition list). The

global and local scopes of a parameter expression are sand-boxed so that it is not possible to make topological

changes to the Node Graph whilst it is being resolved.

23 NODEGRAPH API | PARAMETER EXPRESSIONS

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Amazon VERSION 2.0V1 Guía de usuario Pagina 172