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Flags. Python
examples.
isDirty( string... , [connection=boolean], [datablock=boolean])
Note: Strings representing object names and
arguments must be separated by commas. This is not depicted in the
synopsis.
isDirty is undoable, NOT queryable, and NOT
editable.
The isDirty command is used to check if a plug is dirty. The
return value is 0 if it is not and 1 if it is. If more than one
plug is specified then the result is the logical "or" of all
objects (ie. returns 1 if *any* of the plugs are dirty).
| boolean |
Is the plug dirty? If more than one plug is given then it
returns the logical "and" of all dirty states. |
attributeQuery, getClassification, isConnected, nodeType, objExists, objectType
connection, datablock
| Long name (short name) |
Argument types |
Properties |
datablock(d) |
boolean |
 |
|
Check the datablock entry for the plug. |
|
connection(c) |
boolean |
|
|
Check the connection of the plug (default). |
|
| Flag can appear in Create mode of
command |
 Flag can appear in Edit mode of command |
 Flag can appear in Query mode of command |
 Flag can have multiple arguments, passed
either as a tuple or a list. |
import maya.cmds as cmds
# Create a plusMinusAverage node and a transform. We set the 'skipSelect'
# flag so that they are not displayed in the Attribute Editor because
# that would force an evaluation and cause the plugs to become clean.
import maya.cmds as cmds
cmds.createNode('plusMinusAverage', n='pma', skipSelect=True)
cmds.createNode('transform', n='t', skipSelect=True)
# Hide the transform so that Maya's draw won't force an evaluation which
# would clean its plugs.
cmds.hide('t')
# Connect the transform's 'tx' to one of the plusMinusAverage node's
# inputs.
cmds.connectAttr('t.tx', 'pma.input1D[0]')
# Set the value of the transform's 'tx' and check that the
# target of the connection has become dirty.
cmds.setAttr('t.tx', 13)
cmds.isDirty('pma.input1D[0]')
# Result: 1 #
# If we retrieve the value of the destination attribute
# then the connection becomes clean.
cmds.getAttr('pma.input1D[0]')
# Result: 13.0 #
cmds.isDirty('pma.input1D[0]')
# Result: 0 #
# A plusMinusAverage node's 'output1D' attribute depends
# upon the values in its 'input1D' array. Since we haven't
# retrieved its value yet, it should still be dirty. However,
# it seems to be clean:
cmds.isDirty('pma.output1D')
# Result: 0 #
# The reason for this is that the 'isDirty' command
# by default only checks connections and 'output1D' has
# no connection to be dirty. If we instead check its
# value in the datablock, we get the expected result:
cmds.isDirty('pma.output1D', d=True)
# Result: 1 #
# The output value will remain dirty until we
# force its evaluation by retrieving it.
cmds.getAttr('pma.output1D')
# Result: 13.0 #
cmds.isDirty('pma.output1D', d=True)
# Result: 0 #